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




Representatives:
e1k5nA1[A:182-276]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
MAJOR HISTOCOMPATIBILITY COMPLEX MOLECULE HLA-B*2709 ; X-RAY DIFFRACTION 1.09Å
e1k5nB1[B:0-99]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
BETA-2-MICROGLOBULIN, LIGHT CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 1.09Å
e1mjuH2[H:114-230]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
IMMUNOGLOBULIN MS6-12 ; ligands: GOL ; X-RAY DIFFRACTION 1.22Å
e2ny2D2[D:3129-3228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY 17B, HEAVY CHAIN ; X-RAY DIFFRACTION 2.000Å
e2ny5H2[H:3129-3228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY 17B, HEAVY CHAIN ; X-RAY DIFFRACTION 2.500Å
e2nyyD2[D:119-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CR1 monoclonal antibody ; X-RAY DIFFRACTION 2.600Å
e2nz9D2[D:119-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AR2 monoclonal antibody ; X-RAY DIFFRACTION 3.500Å
e2nz9F2[F:119-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AR2 monoclonal antibody ; X-RAY DIFFRACTION 3.500Å
e2oslA2[A:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
heavy chain of the Rituximab Fab fragment,heavy chain of the Rituximab Fab fragment ; X-RAY DIFFRACTION 2.600Å
e2p8lB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NMAB 2F5, HEAVY CHAIN ; X-RAY DIFFRACTION 2.44Å
e2p8mB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NMAB 2F5, HEAVY CHAIN ; X-RAY DIFFRACTION 2.7Å
e2p8pB2[B:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NMAB 2F5, HEAVY CHAIN ; X-RAY DIFFRACTION 2.7Å
e2pr4H2[H:133-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NMAB 2F5 FAB' LIGHT CHAIN ; X-RAY DIFFRACTION 2.05Å
e2pw1B2[B:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 FAB FRAGMENT LIGHT CHAIN ; X-RAY DIFFRACTION 2.6Å
e2pw2B2[B:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 FAB' LIGHT CHAIN ; X-RAY DIFFRACTION 2.55Å
e2r56H2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IGE FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 2.8Å
e2r56I2[I:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IGE FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 2.8Å
e2v7nB2[B:150-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 1.90Å
e2v7nD2[D:150-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 1.90Å
e2v7nF2[F:150-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 1.90Å
e2v7nH2[H:150-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 1.90Å
e2vxsJ2[J:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB FRAGMENT ; X-RAY DIFFRACTION 2.63Å
e3b2uC2[C:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uF2[F:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uH2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uJ2[J:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uN2[N:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uQ2[Q:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uT2[T:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2uW2[W:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 Fab Heavy chain ; X-RAY DIFFRACTION 2.570Å
e3b2vH2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IMC-11F8 FAB Heavy chain ; X-RAY DIFFRACTION 3.300Å
e3bdyH2[H:116-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab Fragment -Heavy Chain ; X-RAY DIFFRACTION 2.600Å
e3be1H2[H:116-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab Fragment-Heavy Chain ; X-RAY DIFFRACTION 2.900Å
e3c2aH2[H:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 447-52D heavy chain ; X-RAY DIFFRACTION 2.1Å
e3c2aI2[I:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 447-52D heavy chain ; X-RAY DIFFRACTION 2.1Å
e3d0lB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 LIGHT CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 2.35Å
e3droB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 Fab heavy chain ; X-RAY DIFFRACTION 3.9Å
e3drqB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 Fab' heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 2.0Å
e3drtB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 Fab' heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 3.3Å
e3efdH2[H:123-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FABH ; X-RAY DIFFRACTION 2.6Å
e3effB2[B:125-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB ; X-RAY DIFFRACTION 3.8Å
e3effD2[D:125-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB ; X-RAY DIFFRACTION 3.8Å
e3egsB2[B:134-233] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 FAB' HEAVY CHAIN ; X-RAY DIFFRACTION 3.6Å
e3eo0B2[B:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GC-1008 Fab Heavy Chain ; ligands: GOL ; X-RAY DIFFRACTION 1.750Å
e3eo0D2[D:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GC-1008 Fab Heavy Chain ; ligands: GOL ; X-RAY DIFFRACTION 1.750Å
e3eo1B2[B:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GC-1008 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.1Å
e3eo1E2[E:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GC-1008 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.1Å
e3eo1H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GC-1008 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.1Å
e3eo1K2[K:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GC-1008 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.1Å
e3eyoB2[B:126-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AD-2 ; X-RAY DIFFRACTION 2.5Å
e3eyvH2[H:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hu3S193 Fab, heavy chain ; ligands: ZN ; X-RAY DIFFRACTION 2.50Å
e3fn0H2[H:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB Z13E1 ; X-RAY DIFFRACTION 1.8Å
e3fo0H2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Catalytic antibody Fab 13G5 IgG2b heavy chain chimera ; X-RAY DIFFRACTION 2.50Å
e3fo1B2[B:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Catalytic antibody Fab 13G5 IgG2b heavy chain chimera ; X-RAY DIFFRACTION 2.20Å
e3fo1H2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Catalytic antibody Fab 13G5 IgG2b heavy chain chimera ; X-RAY DIFFRACTION 2.20Å
e3fo2B2[B:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Catalytic antibody Fab 13G5 IgG2b heavy chain chimera ; X-RAY DIFFRACTION 2.18Å
e3fo2H2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Catalytic antibody Fab 13G5 IgG2b heavy chain chimera ; X-RAY DIFFRACTION 2.18Å
e3g04B2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HUMAN THYROID STIMULATING AUTOANTIBODY M22 HEAVY CHAIN ; X-RAY DIFFRACTION 2.55Å
e3g6aB2[B:123-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CNTO607 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.1Å
e3g6aH2[H:123-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CNTO607 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.1Å
e3gbmH2[H:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY (FAB) ; X-RAY DIFFRACTION 2.7Å
e3gheH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 537-10D, heavy chain ; X-RAY DIFFRACTION 1.990Å
e3gizH2[H:123-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB FRAGMENT OF ANTI-CD20 ANTIBODY OFATUMUMAB, HEAVY CHAIN ; ligands: ZN ; X-RAY DIFFRACTION 2.2Å
e3go1H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 268-D, heavy chain ; ligands: SO4 ; X-RAY DIFFRACTION 1.880Å
e3hi5H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain of Fab fragment of AL-57 against alpha L I domain ; X-RAY DIFFRACTION 2.500Å
e3hi6H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain of Fab fragment of AL-57 against alpha L I domain ; ligands: SO4 ; X-RAY DIFFRACTION 2.300Å
e3hi6X2[X:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain of Fab fragment of AL-57 against alpha L I domain ; ligands: SO4 ; X-RAY DIFFRACTION 2.300Å
e3idiB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2F5 FAB HEAVY CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 2.1Å
e3inuM2[M:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
KZ52 antibody fragment heavy chain ; X-RAY DIFFRACTION 2.500Å
e3iu3A2[A:116-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF FAB FRAGMENT OF BASILIXIMAB ; X-RAY DIFFRACTION 2.9Å
e3iu3C2[C:116-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF FAB FRAGMENT OF BASILIXIMAB ; X-RAY DIFFRACTION 2.9Å
e3iu3H2[H:116-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF FAB FRAGMENT OF BASILIXIMAB ; X-RAY DIFFRACTION 2.9Å
e3ixtA2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MOTAVIZUMAB FAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.75Å
e3ixtH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MOTAVIZUMAB FAB HEAVY CHAIN ; ligands: EDO ; X-RAY DIFFRACTION 2.75Å
e3jwdP2[P:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB 48D HEAVY CHAIN ; X-RAY DIFFRACTION 2.61Å
e3kymF2[F:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN LI33 IGG2 ; X-RAY DIFFRACTION 2.62Å
e3kymH2[H:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN LI33 IGG2 ; X-RAY DIFFRACTION 2.62Å
e3kymJ2[J:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN LI33 IGG2 ; X-RAY DIFFRACTION 2.62Å
e3kymL2[L:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN LI33 IGG2 ; X-RAY DIFFRACTION 2.62Å
e3kymN2[N:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN LI33 IGG2 ; X-RAY DIFFRACTION 2.62Å
e3kymP2[P:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN LI33 IGG2 ; X-RAY DIFFRACTION 2.62Å
e3l5wB2[B:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
C836 HEAVY CHAIN ; X-RAY DIFFRACTION 2.0Å
e3l7eB2[B:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH
C836 HEAVY CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 2.5Å
e3l7eH2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH
C836 HEAVY CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 2.5Å
e3l7fB2[B:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H2L6 HEAVY CHAIN ; X-RAY DIFFRACTION 2.60Å
e3l7fE2[E:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
H2L6 HEAVY CHAIN ; X-RAY DIFFRACTION 2.60Å
e3l95H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
anti-NRR1 fab fragment heavy chain ; X-RAY DIFFRACTION 2.19Å
e3lmjH2[H:126-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF ANTI HIV FAB FROM HUMAN 21C ANTIBODY ; ligands: MPD ; X-RAY DIFFRACTION 2.2Å
e3lqaH2[H:126-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain of anti HIV Fab from human 21c antibody ; X-RAY DIFFRACTION 3.4Å
e3lrsA2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG-16 Heavy Chain Fab ; X-RAY DIFFRACTION 2.370Å
e3lrsE2[E:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG-16 Heavy Chain Fab ; X-RAY DIFFRACTION 2.370Å
e3lrsH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG-16 Heavy Chain Fab ; X-RAY DIFFRACTION 2.370Å
e3ma9H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab8066 FAB ANTIBODY FRAGMENT, Heavy Chain ; X-RAY DIFFRACTION 2.05Å
e3mlsK2[K:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Human monoclonal anti-HIV-1 gp120 V3 antibody 2557 Fab heavy chain ; X-RAY DIFFRACTION 2.500Å
e3mmeA2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG16 HEAVY CHAIN FAB ; X-RAY DIFFRACTION 3.97Å
e3mmeH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG16 HEAVY CHAIN FAB ; X-RAY DIFFRACTION 3.97Å
e3mnwB2[B:114-225] Image Pymol Jmol Links: PDB, SCOP, CATH
ANTI-HIV-1 ANTIBODY 13H11 HEAVY CHAIN ; X-RAY DIFFRACTION 2.2Å
e3mnzB2[B:114-225] Image Pymol Jmol Links: PDB, SCOP, CATH
ANTI-HIV-1 ANTIBODY 13H11 HEAVY CHAIN ; X-RAY DIFFRACTION 1.8Å
e3nfpA2[A:117-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF FAB FRAGMENT OF DACLIZUMAB ; X-RAY DIFFRACTION 2.86Å
e3nfpH2[H:117-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF FAB FRAGMENT OF DACLIZUMAB ; X-RAY DIFFRACTION 2.86Å
e3nfsH2[H:117-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LIGHT CHAIN OF FAB FRAGMENT OF DACLIZUMAB ; X-RAY DIFFRACTION 2.6Å
e3nh7H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY FRAGMENT FAB ABD1556, HEAVY CHAIN ; X-RAY DIFFRACTION 2.7Å
e3nh7I2[I:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY FRAGMENT FAB ABD1556, HEAVY CHAIN ; X-RAY DIFFRACTION 2.7Å
e3o2dH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IBALIZUMAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.19Å
e3oayM2[M:115-228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 2G12, heavy chain ; X-RAY DIFFRACTION 1.95Å
e3oazH2[H:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 2G12, heavy chain ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.75Å
e3ob0H2[H:115-228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 2G12, heavy chain ; X-RAY DIFFRACTION 2.85Å
e3ob0M2[M:115-228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 2G12, heavy chain ; X-RAY DIFFRACTION 2.85Å
e3p30H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
1281 Fab heavy chain ; X-RAY DIFFRACTION 3.300Å
e3piqC2[C:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Human monoclonal antibody 2909 Fab heavy chain ; X-RAY DIFFRACTION 3.325Å
e3piqG2[G:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Human monoclonal antibody 2909 Fab heavy chain ; X-RAY DIFFRACTION 3.325Å
e3pjsB2[B:125-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.8Å
e3pjsD2[D:125-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.8Å
e3pnwB2[B:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwE2[E:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwH2[H:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwK2[K:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwN2[N:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwQ2[Q:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwT2[T:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pnwW2[W:130-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB heavy chain ; ligands: UNX ; X-RAY DIFFRACTION 2.050Å
e3pp3H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GA101 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.51Å
e3pp4H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GA101 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 1.6Å
e3q1sH2[H:126-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Z13E1 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.15Å
e3qosB2[B:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: GOL,SO4
e3qotH2[H:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: GOL
e3qpqH2[H:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH
C1068 heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 1.90Å
e3qq9D2[D:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH
101F HEAVY CHAIN ; X-RAY DIFFRACTION 1.64Å
e3qq9H2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH
101F HEAVY CHAIN ; X-RAY DIFFRACTION 1.64Å
e3qrgH2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH
Fab heavy chain Fd fragment ; ligands: BTB,GOL,SO4 ; X-RAY DIFFRACTION 1.70Å
e3qwoA2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MOTAVIZUMAB HEAVY CHAIN ; ligands: EDO ; X-RAY DIFFRACTION 1.9Å
e3qwoH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MOTAVIZUMAB HEAVY CHAIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.9Å
e3ru8H2[H:114-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Antibody b12, Heavy Chain ; ligands: GOL ; X-RAY DIFFRACTION 2.070Å
e3s37H2[H:117-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
1121B Fab heavy chain ; X-RAY DIFFRACTION 2.7Å
e3sqoH2[H:114-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
J16 HEAVY CHAIN ; X-RAY DIFFRACTION 2.7Å
e3t2nH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY, FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 2.55Å
e3t2nI2[I:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY, FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 2.55Å
e3tclA2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH04 HEAVY CHAIN FAB ; X-RAY DIFFRACTION 1.91Å
e3tclH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH04 HEAVY CHAIN FAB ; X-RAY DIFFRACTION 1.91Å
e3u0wH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH
Fab Heavy Chain, Ig gamma-1 chain C region ; X-RAY DIFFRACTION 1.997Å
e3u30C2[C:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain Fab ; X-RAY DIFFRACTION 2.428Å
e3u36A2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG9 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.28Å
e3u36C2[C:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG9 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.28Å
e3u36E2[E:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG9 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.28Å
e3u36H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PG9 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 3.28Å
e3u46A2[A:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH04 HEAVY CHAIN FAB ; X-RAY DIFFRACTION 2.91Å
e3u46H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH04 HEAVY CHAIN FAB ; X-RAY DIFFRACTION 2.91Å
e3u4bH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH04 HEAVY CHAIN ; X-RAY DIFFRACTION 2.89Å
e3uajH2[H:124-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN, MONOCLONAL ANTIBODY 5H2 ; X-RAY DIFFRACTION 3.23Å
e3uc0H2[H:124-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain, monoclonal antibody 5H2 ; X-RAY DIFFRACTION 2.710Å
e3uc0I2[I:124-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain, monoclonal antibody 5H2 ; X-RAY DIFFRACTION 2.710Å
e3ujiH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab region of the heavy chain of anti-HIV-1 V3 monoclonal antibody 2558 ; X-RAY DIFFRACTION 1.6Å
e3utzB2[B:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Metalloproteinase, heavy chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.18Å
e3utzC2[C:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Metalloproteinase, heavy chain ; X-RAY DIFFRACTION 2.18Å
e3utzF2[F:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Metalloproteinase, heavy chain ; X-RAY DIFFRACTION 2.18Å
e4dkfH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB2 HEAVY CHAIN ; X-RAY DIFFRACTION 2.61Å
e4dtgH2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Humanized recombinant FAB fragment, FAB 2021, of a murine antibody, heavy chain ; ligands: GOL,MES ; X-RAY DIFFRACTION 1.800Å
e4dvrH2[H:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 48d Heavy chain ; X-RAY DIFFRACTION 2.5Å
e4f57H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF FAB OF A NEUTRALIZING ANTIBODY L1 ; X-RAY DIFFRACTION 1.7Å
e4g3yH2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
INFLIXIMAB FAB H ; X-RAY DIFFRACTION 2.6Å
e4g5zH2[H:119-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CANAKINUMAB ANTIBODY FRAGMENT HEAVY CHAIN ; X-RAY DIFFRACTION 1.83Å
e4g6kH2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF GEVOKIZUMAB ANTIBODY BINDING FRAGMENT ; X-RAY DIFFRACTION 1.9Å
e4g6mH2[H:121-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
heavy chain of gevokizumab antibody binding fragment ; X-RAY DIFFRACTION 1.800Å
e4hkxA2[A:127-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH67 heavy chain ; X-RAY DIFFRACTION 2.0Å
e4hpyH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CH59 FAB HEAVY CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 1.5Å
e4j1uD2[D:118-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY 93F3 HEAVY CHAIN ; X-RAY DIFFRACTION 2.58Å
e4jpvH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HEAVY CHAIN OF ANTIBODY 3BNC117 ; X-RAY DIFFRACTION 2.8Å
e4jqiH2[H:124-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB30 HEAVY CHAIN ; X-RAY DIFFRACTION 2.6Å
e7fabH2[H:118-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IGG1-LAMBDA NEW FAB (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.0Å
e1ad0B2[B:114-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY A5B7 (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.5Å
e1ad0D2[D:114-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ANTIBODY A5B7 (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.5Å
e1ad9B2[B:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IGG CTM01 FAB (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.8Å
e1ad9H2[H:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IGG CTM01 FAB (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.8Å
e1om3H2[H:116-228] Image Pymol Jmol Links: PDB, SCOP, CATH
e1op3H2[H:116-228] Image Pymol Jmol Links: PDB, SCOP, CATH
e1op3M2[M:116-228] Image Pymol Jmol Links: PDB, SCOP, CATH
e2b4cH2[H:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
anti-HIV-1 gp120 immunoglobulin X5 heavy chain ; ligands: SO4,XYL ; X-RAY DIFFRACTION 3.300Å
e2qscH2[H:114-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB F425-B4E8, HEAVY CHAIN ; ligands: CL,ZN ; X-RAY DIFFRACTION 2.8Å
e2r0kH2[H:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
antibody heavy chain of Fab58, Fab portion only ; X-RAY DIFFRACTION 3.5Å
e2r0lH2[H:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
antibody heavy chain, Fab portion only ; X-RAY DIFFRACTION 2.2Å
e2rcjA2[A:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjB2[B:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjE2[E:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjF2[F:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjI2[I:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjJ2[J:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjM2[M:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjN2[N:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjQ2[Q:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2rcjR2[R:120-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
IgA1 light chain ; SOLUTION SCATTERING
e2vxqH2[H:118-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB ; X-RAY DIFFRACTION 1.90Å
e3eoaB2[B:122-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EFALIZUMAB FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 2.8Å
e3eoaH2[H:122-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EFALIZUMAB FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 2.8Å
e3eobB2[B:122-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EFALIZUMAB FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 3.6Å
e3eobH2[H:122-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EFALIZUMAB FAB FRAGMENT, HEAVY CHAIN ; X-RAY DIFFRACTION 3.6Å
e3eyfD2[D:126-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AD-2 ; X-RAY DIFFRACTION 2.30Å
e3eyqD2[D:126-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
8F9 FAB ; X-RAY DIFFRACTION 2.4Å
e3f12D2[D:126-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
8F9 FAB ; X-RAY DIFFRACTION 2.95Å
e3gkwH2[H:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain of the antibody Nimotuzumab ; X-RAY DIFFRACTION 2.5Å
e3oayH2[H:115-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 2G12, heavy chain ; X-RAY DIFFRACTION 1.95Å
e3oazM2[M:114-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab 2G12, heavy chain ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.75Å
e3pp3I2[I:121-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GA101 FAB HEAVY CHAIN ; X-RAY DIFFRACTION 2.51Å
e3tnnH2[H:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH
Fab heavy chain of ADCC and non-neutralizing anti-HIV-1 antibody N5-i5 ; ligands: CL,SO4 ; X-RAY DIFFRACTION 1.95Å
Previous Nexte1mjuL2[L:108-214]
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Pymol
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IMMUNOGLOBULIN MS6-12 ; ligands: GOL ; X-RAY DIFFRACTION 1.22Å
e1ogaE2[E:119-245]
nonrep
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T-CELL RECEPTOR BETA CHAIN C REGION ; X-RAY DIFFRACTION 1.4Å
e1l6xA1[A:237-341]
nonrep
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IMMUNOGLOBULIN GAMMA-1 HEAVY CHAIN CONSTANT REGION ; X-RAY DIFFRACTION 1.65Å
e1l6xA2[A:342-443]
nonrep
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IMMUNOGLOBULIN GAMMA-1 HEAVY CHAIN CONSTANT REGION ; X-RAY DIFFRACTION 1.65Å
e1rzfL2[L:109-210]
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FAB E51 LIGHT CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å
e2h26A1[A:184-279]
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T-CELL SURFACE GLYCOPROTEIN CD1B ; ligands: GOL ; X-RAY DIFFRACTION 1.8Å
e1uvqA1[A:85-183]
nonrep
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HLA CLASS II HISTOCOMPATIBILITY ANTIGEN ; ligands: GLY,NAG ; X-RAY DIFFRACTION 1.800Å
e1uvqB1[B:95-191]
nonrep
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HLA CLASS II HISTOCOMPATIBILITY ANTIGEN ; X-RAY DIFFRACTION 1.800Å
e1u58A1[A:145-242]
nonrep
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MHC-I HOMOLOG M144 ; X-RAY DIFFRACTION 1.9Å
e2fbjH2[H:119-220]
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IGA-KAPPA J539 FAB (HEAVY CHAIN) ; X-RAY DIFFRACTION 1.95Å
e3fruA1[A:179-269]
nonrep
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NEONATAL FC RECEPTOR ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 2.2Å
e1dn0B2[B:121-225]
nonrep
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IGM-KAPPA COLD AGGLUTININ (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.28Å
e1fp5A1[A:336-438]
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IGE HEAVY CHAIN EPSILON-1 ; X-RAY DIFFRACTION 2.3Å
e1fp5A2[A:439-543]
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IGE HEAVY CHAIN EPSILON-1 ; X-RAY DIFFRACTION 2.3Å
e1hdmA1[A:94-196]
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PROTEIN (CLASS II HISTOCOMPATIBILITY ANTIGEN, M ALPHA CHAIN) ; X-RAY DIFFRACTION 2.5Å
e1hdmB1[B:88-185]
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PROTEIN (CLASS II HISTOCOMPATIBILITY ANTIGEN, M BETA CHAIN) ; X-RAY DIFFRACTION 2.5Å
e3pl6A2[A:83-180]
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MHC class II HLA-DQ-alpha chain ; ligands: NAG ; X-RAY DIFFRACTION 2.55Å
e1o0vA1[A:228-330]
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Immunoglobulin heavy chain epsilon-1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.6Å
e1hyrC1[C:181-274]
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MHC CLASS I CHAIN-RELATED PROTEIN A ; X-RAY DIFFRACTION 2.7Å
e1hzhH6[H:114-235]
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IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 2.70Å
e1hzhH7[H:236-359]
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IMMUNOGLOBULIN HEAVY CHAIN ; ligands: BMA,GAL,MAN,NAG ; X-RAY DIFFRACTION 2.70Å
e1hzhH8[H:360-478]
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IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 2.70Å
e3rdtC2[C:83-178]
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H-2 class II histocompatibility antigen, A-B alpha chain ; X-RAY DIFFRACTION 2.70Å
e1hxmA2[A:121-206]
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GAMMA-DELTA T-CELL RECEPTOR ; X-RAY DIFFRACTION 3.00Å
e1hxmB2[B:124-230]
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GAMMA-DELTA T-CELL RECEPTOR ; X-RAY DIFFRACTION 3.00Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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
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