Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices
alpha superhelicesrepeating alpha-helix hairpins form a superhelix
alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain
alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix
beta barrelssingle beta-sheet folded upon itself to form a barrel
beta meanderssingle beta-sheet with mainly meander topology
beta sandwichestwo beta-sheets stacked together to form a sandwich
beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain
beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander
a+b two layersone alpha-helix layer and one beta-sheet layer




Representatives:
e1k5nA2[A:1-181]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
MAJOR HISTOCOMPATIBILITY COMPLEX MOLECULE HLA-B*2709 ; ligands: GOL ; X-RAY DIFFRACTION 1.09Å
e4d0dG1[G:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MAJOR HISTOCOMPATIBILITY COMPLEX CLASS I GLYCOPROTEIN HAPLOTYPE B2 ; X-RAY DIFFRACTION 3.13Å
e4wu5A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.40Å
e4wu5D1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.40Å
e4wu7A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.297Å
e4wu7D1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.297Å
e4cw1A1[A:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MAJOR HISTOCOMPATIBILITY COMPLEX CLASS I GLYCOPROTEIN HAPLOTYPE B14 ; X-RAY DIFFRACTION 2.58Å
e4cvxA1[A:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC CLASS I ALPHA CHAIN 2 ; X-RAY DIFFRACTION 3.30Å
e4cvxD1[D:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC CLASS I ALPHA CHAIN 2 ; X-RAY DIFFRACTION 3.30Å
e4d0dD2[D:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MAJOR HISTOCOMPATIBILITY COMPLEX CLASS I GLYCOPROTEIN HAPLOTYPE B2 ; X-RAY DIFFRACTION 3.13Å
e4d0dJ1[J:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MAJOR HISTOCOMPATIBILITY COMPLEX CLASS I GLYCOPROTEIN HAPLOTYPE B2 ; X-RAY DIFFRACTION 3.13Å
e4cw1D1[D:2-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MAJOR HISTOCOMPATIBILITY COMPLEX CLASS I GLYCOPROTEIN HAPLOTYPE B14 ; X-RAY DIFFRACTION 2.58Å
e4wdiA2[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.313Å
e4wdiD1[D:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 2.313Å
e4z76A2[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 1.880Å
e4z76D2[D:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 1.880Å
e4z77A1[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: 15P,EDO,GOL ; X-RAY DIFFRACTION 1.850Å
e4z77D2[D:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: 15P,EDO,GOL,SO4 ; X-RAY DIFFRACTION 1.850Å
e4z78A1[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.304Å
e4z78D1[D:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.304Å
e4z78G2[G:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.304Å
e4mvbA1[A:2-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, L-D alpha chain ; X-RAY DIFFRACTION 3.1Å
e4mxqA1[A:2-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, L-D alpha chain ; X-RAY DIFFRACTION 2.60Å
e4n0cA1[A:2-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, L-D alpha chain ; X-RAY DIFFRACTION 2.68Å
e4n0cE1[E:2-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, L-D alpha chain ; X-RAY DIFFRACTION 2.68Å
e4n5eA1[A:2-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, L-D alpha chain ; X-RAY DIFFRACTION 3.06Å
e5d2lA2[A:2-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.500Å
e5d2lG1[G:2-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.500Å
e5d2lM1[M:2-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.500Å
e5d2lC1[C:2-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.500Å
e5d2nH1[H:2-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.099Å
e5d2nA1[A:2-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: IMD ; X-RAY DIFFRACTION 2.099Å
e5bxfA1[A:5-168] Image Pymol Jmol Links: PDB, SCOP, CATH
IgG receptor FcRn large subunit p51 ; X-RAY DIFFRACTION 2.85Å
e5bxfC2[C:5-168] Image Pymol Jmol Links: PDB, SCOP, CATH
IgG receptor FcRn large subunit p51 ; X-RAY DIFFRACTION 2.85Å
e5defA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.60Å
e5degA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I antigen ; ligands: GOL ; X-RAY DIFFRACTION 1.83Å
e4wuuA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.047Å
e4zfzA2[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major histocompatibility complex class I ; ligands: CL,EDO,MYR,TRS,ZN ; X-RAY DIFFRACTION 1.76Å
e4zfzD2[D:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major histocompatibility complex class I ; ligands: EDO,MYR,TRS,ZN ; X-RAY DIFFRACTION 1.76Å
e4zfzG2[G:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major histocompatibility complex class I ; ligands: CL,EDO,MYR,ZN ; X-RAY DIFFRACTION 1.76Å
e4zfzJ2[J:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major histocompatibility complex class I ; ligands: CL,EDO,MYR,ZN ; X-RAY DIFFRACTION 1.76Å
e5e8nA1[A:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.24Å
e5e8nD1[D:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.24Å
e5e8nG2[G:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.24Å
e5e8nJ2[J:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.24Å
e5e8oA2[A:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 1.980Å
e5e8oD1[D:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 1.980Å
e5e8pA2[A:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.0Å
e5e8pD1[D:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.0Å
e5eo0A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-7 alpha chain ; X-RAY DIFFRACTION 1.700Å
e5eo1A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-7 alpha chain ; X-RAY DIFFRACTION 1.85Å
e5eu3A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.970Å
e5eu4A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.120Å
e5eu4D1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.120Å
e5eu5A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 1.540Å
e5eu6A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.020Å
e5brzA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-1 alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.620Å
e5bs0A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-1 alpha chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.130Å
e5hhmA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.500Å
e5hhmF1[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.500Å
e5hhnA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.03Å
e5hhpA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 1.900Å
e5hhqA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.100Å
e5hhoA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.950Å
e5b38A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; X-RAY DIFFRACTION 2.30Å
e5b39A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; X-RAY DIFFRACTION 2.50Å
e4zuwA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Classical MHC class I antigen ; X-RAY DIFFRACTION 2.6Å
e4zusA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Classical MHC class I antigen ; X-RAY DIFFRACTION 2.6Å
e4zutA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Classical MHC class I antigen ; X-RAY DIFFRACTION 2.6Å
e4zuuA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Classical MHC class I antigen ; X-RAY DIFFRACTION 2.2Å
e4zuvA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Classical MHC class I antigen ; X-RAY DIFFRACTION 2.3Å
e4zuvD2[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Classical MHC class I antigen ; X-RAY DIFFRACTION 2.3Å
e4zezA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
e4zezD2[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
e5c07A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.108Å
e5c07F2[F:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.108Å
e5c08A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.332Å
e5c08F2[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.332Å
e5c09A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.475Å
e5c09F1[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.475Å
e5c0aA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.460Å
e5c0aF2[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.460Å
e5c0cA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,PG4,SO4 ; X-RAY DIFFRACTION 1.970Å
e5c0cF1[F:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.970Å
e5c0dA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 1.680Å
e5c0eA1[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: BR,EDO,GOL,PG4 ; X-RAY DIFFRACTION 1.490Å
e5c0fA2[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: ACY,EDO,GOL,SO4 ; X-RAY DIFFRACTION 1.460Å
e5c0gA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 1.370Å
e5c0hA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: EDO,SO4
e5c0iA2[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 1.530Å
e5c0jA2[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 1.640Å
e5hyjA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.06Å
e5hyjF2[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 3.06Å
e5c0bA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.030Å
e5c0bF1[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.030Å
e5h94A1[A:2-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I antigen ; X-RAY DIFFRACTION 1.48Å
e5h94D1[D:2-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I antigen ; X-RAY DIFFRACTION 1.48Å
e5e9dF1[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.500Å
e5hgaA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.199Å
e5hgaD2[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.199Å
e5hgbA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.4Å
e5hgbD2[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.4Å
e5hgbG1[G:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.4Å
e5hgbJ2[J:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.4Å
e5hgdA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.07Å
e5hgdD1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.07Å
e5hghA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.392Å
e5e9dA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.500Å
e5d9sA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.87Å
e5j6gA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, Q10 alpha chain ; X-RAY DIFFRACTION 3.30Å
e5j6gC1[C:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, Q10 alpha chain ; X-RAY DIFFRACTION 3.30Å
e5j6hA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, Q10 alpha chain ; ligands: NA,NCA ; X-RAY DIFFRACTION 2.3Å
e5ddhA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.500Å
e5iroU2[U:5-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.64Å
e5iroA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.64Å
e5iroE1[E:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.64Å
e5iroI1[I:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.64Å
e5iroM1[M:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.64Å
e5iroQ1[Q:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.64Å
e5swzP1[P:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.65Å
e5im7A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA-B*58:01 Heavy Chain ; X-RAY DIFFRACTION 2.5Å
e5im7C2[C:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA-B*58:01 Heavy Chain ; X-RAY DIFFRACTION 2.5Å
e5incA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-58 alpha chain ; X-RAY DIFFRACTION 2.88Å
e5incC1[C:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-58 alpha chain ; X-RAY DIFFRACTION 2.88Å
e5indA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-58 alpha chain ; X-RAY DIFFRACTION 2.11Å
e5indC1[C:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-58 alpha chain ; X-RAY DIFFRACTION 2.11Å
e5swqA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.000Å
e5swsA1[A:1-172] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.860Å
e5swzA1[A:1-172] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.65Å
e5swzF1[F:1-172] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; X-RAY DIFFRACTION 2.65Å
e5swzK2[K:1-172] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.65Å
e5e6iI1[I:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 4.000Å
e5e6iM1[M:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 4.000Å
e5e6iR1[R:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 4.000Å
e5e6iC1[C:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 4.000Å
e5enwA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.85Å
e5euoA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.100Å
e5euoC2[C:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: IMD ; X-RAY DIFFRACTION 2.100Å
e5f1iD2[D:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1iG2[G:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1iM1[M:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1iP1[P:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1iS2[S:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1iV2[V:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1nA1[A:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I antigen ; X-RAY DIFFRACTION 2.0Å
e5f1nD1[D:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I antigen ; X-RAY DIFFRACTION 2.0Å
e5f1iA2[A:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5f1iJ2[J:1-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MHC class I DLA-88 ; X-RAY DIFFRACTION 2.696Å
e5iehA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, B-40 alpha chain ; X-RAY DIFFRACTION
e5iekA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH
HLA class I histocompatibility antigen, B-40 alpha chain ; X-RAY DIFFRACTION
e5eotA1[A:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.1Å
e5menA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 2.809Å
e5meoA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL,SO4 ; X-RAY DIFFRACTION 1.772Å
e5mepA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.710Å
e5mepD2[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO ; X-RAY DIFFRACTION 2.710Å
e5meqA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO ; X-RAY DIFFRACTION 2.27Å
e5merA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: CA,EDO,GOL,MES,SO4 ; X-RAY DIFFRACTION 1.880Å
e5merD1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: CA,EDO,MES,SO4 ; X-RAY DIFFRACTION 1.880Å
e5f9jA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.500Å
e5fdwA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.7Å
e5f7dA1[A:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.3Å
e5fa3A2[A:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.86Å
e5fa4A2[A:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.4Å
e5e00A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: SO4 ; X-RAY DIFFRACTION 1.7Å
e5ib1A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; X-RAY DIFFRACTION 1.91Å
e5ib2A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.44Å
e5ib3A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; ligands: CU,GOL ; X-RAY DIFFRACTION 1.91Å
e5ib4A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; ligands: GOL,NI ; X-RAY DIFFRACTION 1.95Å
e5ib5A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; ligands: CU ; X-RAY DIFFRACTION 2.49Å
e5ib5D2[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-27 alpha chain ; ligands: CU,GOL ; X-RAY DIFFRACTION 2.49Å
e5n1yA1[A:0-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.390Å
e5t6yA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; ligands: ACT,GOL ; X-RAY DIFFRACTION 1.76Å
e5t6wA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.9Å
e5t6xA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 1.686Å
e5t6zA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; X-RAY DIFFRACTION 2.000Å
e5t70A2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, B-57 alpha chain ; X-RAY DIFFRACTION 2.10Å
e5iszA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.060Å
e5jhdA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.460Å
e5jhdF2[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.460Å
e5bjtA1[A:5-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgG receptor FcRn large subunit p51 ; X-RAY DIFFRACTION 3.200Å
e5bjtC2[C:5-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgG receptor FcRn large subunit p51 ; X-RAY DIFFRACTION 3.200Å
e5bjtE1[E:5-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgG receptor FcRn large subunit p51 ; X-RAY DIFFRACTION 3.200Å
e5bjtG2[G:5-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgG receptor FcRn large subunit p51 ; X-RAY DIFFRACTION 3.200Å
e5ivxA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-D alpha chain ; ligands: EDO ; X-RAY DIFFRACTION 2.1Å
e5gsrA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 2.198Å
e5gsrC1[C:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 2.198Å
e5gsvA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 1.996Å
e5jwdA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.5Å
e5jweA2[A:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.40Å
e5jweC2[C:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.40Å
e5jweE2[E:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: GOL ; X-RAY DIFFRACTION 2.40Å
e5jweG2[G:1-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, D-B alpha chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.40Å
e5vgdA2[A:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, Cw-5 alpha chain ; X-RAY DIFFRACTION 2.32Å
e5vgeA1[A:2-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
cDNA FLJ54183, highly similar to HLA class I histocompatibility antigen, Cw-7 alpha chain ; ligands: ZN ; X-RAY DIFFRACTION 2.6Å
e5gr7A1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 2.40Å
e5gsxA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 2.5Å
e5gsxD1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H-2 class I histocompatibility antigen, K-D alpha chain ; X-RAY DIFFRACTION 2.5Å
e5jziA2[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.07Å
e5jziF2[F:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-2 alpha chain ; X-RAY DIFFRACTION 2.07Å
e5xovA1[A:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.68Å
e5xovD1[D:1-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HLA class I histocompatibility antigen, A-24 alpha chain ; X-RAY DIFFRACTION 2.68Å
Previous Nexte1t7vA2[A:5-183]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Zinc-alpha-2-glycoprotein ; ligands: NAG,P6G ; X-RAY DIFFRACTION 1.95Å
e3fruA2[A:1-178]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
NEONATAL FC RECEPTOR ; ligands: BME,NAG ; X-RAY DIFFRACTION 2.2Å
e1kcgC1[C:9-186]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
ULBP3 PROTEIN ; ligands: GSH ; X-RAY DIFFRACTION 2.6Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers
a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers
a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers
a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain
a/b barrelsrepeating beta-alpha units form a barrel
a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers
mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions
few secondary structure elementsstabilized by cofactors or disulfides
extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes