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
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Representatives:
e1k5nA1[A:182-276]
nonrep
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Pymol
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MAJOR HISTOCOMPATIBILITY COMPLEX MOLECULE HLA-B*2709 ; X-RAY DIFFRACTION 1.09Å
e1k5nB1[B:0-99]
nonrep
Image
Pymol
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BETA-2-MICROGLOBULIN, LIGHT CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 1.09Å
e1mjuH2[H:114-230]
nonrep
Image
Pymol
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DOI
IMMUNOGLOBULIN MS6-12 ; ligands: GOL ; X-RAY DIFFRACTION 1.22Å
e1mjuL2[L:108-214]
nonrep
Image
Pymol
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IMMUNOGLOBULIN MS6-12 ; ligands: GOL ; X-RAY DIFFRACTION 1.22Å
e1ogaE2[E:119-245]
nonrep
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Pymol
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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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Pymol
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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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Pymol
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IMMUNOGLOBULIN GAMMA-1 HEAVY CHAIN CONSTANT REGION ; X-RAY DIFFRACTION 1.65Å
e1rzfL2[L:109-210]
nonrep
Image
Pymol
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FAB E51 LIGHT CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å
e2h26A1[A:184-279]
nonrep
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Pymol
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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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Pymol
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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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Pymol
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HLA CLASS II HISTOCOMPATIBILITY ANTIGEN ; X-RAY DIFFRACTION 1.800Å
e1u58A1[A:145-242]
nonrep
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Pymol
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MHC-I HOMOLOG M144 ; X-RAY DIFFRACTION 1.9Å
e2fbjH2[H:119-220]
nonrep
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Pymol
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IGA-KAPPA J539 FAB (HEAVY CHAIN) ; X-RAY DIFFRACTION 1.95Å
e3fruA1[A:179-269]
nonrep
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Pymol
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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]
nonrep
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Pymol
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IGE HEAVY CHAIN EPSILON-1 ; X-RAY DIFFRACTION 2.3Å
e1fp5A2[A:439-543]
nonrep
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Pymol
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IGE HEAVY CHAIN EPSILON-1 ; X-RAY DIFFRACTION 2.3Å
e1hdmA1[A:94-196]
nonrep
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Pymol
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PROTEIN (CLASS II HISTOCOMPATIBILITY ANTIGEN, M ALPHA CHAIN) ; X-RAY DIFFRACTION 2.5Å
e1hdmB1[B:88-185]
nonrep
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PROTEIN (CLASS II HISTOCOMPATIBILITY ANTIGEN, M BETA CHAIN) ; X-RAY DIFFRACTION 2.5Å
e3pl6A2[A:83-180]
nonrep
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Pymol
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MHC class II HLA-DQ-alpha chain ; ligands: NAG ; X-RAY DIFFRACTION 2.55Å
e1o0vA1[A:228-330]
nonrep
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Pymol
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Immunoglobulin heavy chain epsilon-1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.6Å
e1hyrC1[C:181-274]
nonrep
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Pymol
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MHC CLASS I CHAIN-RELATED PROTEIN A ; X-RAY DIFFRACTION 2.7Å
e1hzhH6[H:114-235]
nonrep
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IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 2.70Å
e7m2hD2[D:119-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.64Å
e7m74H2[H:130-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; ELECTRON MICROSCOPY
e7mzfH2[H:115-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 37 heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 2.490Å
e7mzgH2[H:118-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 42 heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 2.000Å
e7mzhH2[H:115-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WCSL 119 heavy chain ; X-RAY DIFFRACTION 2.100Å
e7mziH2[H:118-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WCSL 129 heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 1.850Å
e7mzjC2[C:118-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WCSL 129 heavy chain ; X-RAY DIFFRACTION 2.400Å
e7mzjF2[F:118-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WCSL 129 heavy chain ; X-RAY DIFFRACTION 2.400Å
e7mzjH2[H:127-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 93 heavy chain ; X-RAY DIFFRACTION 2.400Å
e7mzjN2[N:127-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 93 heavy chain ; X-RAY DIFFRACTION 2.400Å
e7mzkC2[C:118-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WCSL 129 heavy chain ; X-RAY DIFFRACTION 2.250Å
e7mzkF2[F:118-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WCSL 129 heavy chain ; X-RAY DIFFRACTION 2.250Å
e7mzlH2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 210 heavy chain ; X-RAY DIFFRACTION 3.700Å
e7mzmH2[H:133-233] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 215 heavy chain ; X-RAY DIFFRACTION 2.300Å
e7mznH2[H:123-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PDI 231 heavy chain ; X-RAY DIFFRACTION 3.100Å
e7n4iH2[H:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WRAIR-2057 Antibody Fab Heavy Chain ; ligands: GOL ; X-RAY DIFFRACTION 2.28Å
e7n4jH2[H:132-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WRAIR-2173 antibody Fab heavy chain ; X-RAY DIFFRACTION 2.2Å
e7n4lH2[H:128-230] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
WRAIR-2125 antibody Fab heavy chain ; X-RAY DIFFRACTION 3.43Å
e7nabH2[H:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CV3-25 Fab Heavy Chain ; X-RAY DIFFRACTION 2.140Å
e7nabA2[A:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CV3-25 Fab Heavy Chain ; ligands: NA ; X-RAY DIFFRACTION 2.140Å
e7np1H2[H:122-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Immunoglobulin gamma-1 heavy chain ; X-RAY DIFFRACTION 2.80Å
e7np1I2[I:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Immunoglobulin gamma-1 heavy chain ; X-RAY DIFFRACTION 2.80Å
e7np1J2[J:122-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Immunoglobulin gamma-1 heavy chain ; X-RAY DIFFRACTION 2.80Å
e7np1K2[K:123-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Immunoglobulin gamma-1 heavy chain ; X-RAY DIFFRACTION 2.80Å
e7oh0C2[C:119-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab TT104 ; ELECTRON MICROSCOPY
e7oh1E2[E:126-228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAB TT110 ; ELECTRON MICROSCOPY
e7oo2A2[A:116-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
anti-MenX Fab heavy chain ; X-RAY DIFFRACTION 2.16Å
e7oo2C2[C:116-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
anti-MenX Fab heavy chain ; X-RAY DIFFRACTION 2.16Å
e7pryA2[A:122-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
COVOX-45 Fab heavy chain ; X-RAY DIFFRACTION 3.1Å
e7pryF2[F:122-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
COVOX-45 Fab heavy chain ; X-RAY DIFFRACTION 3.1Å
e7pryH2[H:124-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-6 Fab heavy chain ; X-RAY DIFFRACTION 3.1Å
e7pryC2[C:124-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-6 Fab heavy chain ; X-RAY DIFFRACTION 3.1Å
e7przH2[H:125-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-22 Fab heavy chain ; X-RAY DIFFRACTION 3.2Å
e7ps0H2[H:124-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-24 heavy chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.92Å
e7ps0B2[B:124-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-24 heavy chain ; X-RAY DIFFRACTION 2.92Å
e7ps1A2[A:118-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-27 Fab heavy chain ; ligands: CL,IOD ; X-RAY DIFFRACTION 2.4Å
e7ps2A2[A:128-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-29 Fab heavy chain ; X-RAY DIFFRACTION 2.99Å
e7ps2H2[H:122-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-53 heavy chain ; X-RAY DIFFRACTION 2.99Å
e7ps4H2[H:126-227] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-38 Fab heavy chain ; X-RAY DIFFRACTION 1.94Å
e7ps4B2[B:126-228] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-38 Fab heavy chain ; X-RAY DIFFRACTION 1.94Å
e7ps5H2[H:124-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-47 Fab heavy chain ; X-RAY DIFFRACTION 3.14Å
e7ps6H2[H:128-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-54 Fab heavy chain ; X-RAY DIFFRACTION 2.26Å
e7ps7A2[A:124-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-40 heavy chain ; X-RAY DIFFRACTION 3.9Å
e7ps7H2[H:124-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-40 heavy chain ; X-RAY DIFFRACTION 3.9Å
e7q0gH2[H:118-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FI-3A Fab heavy chain ; ligands: GOL,K,TAR ; X-RAY DIFFRACTION 1.823Å
e7q0hH2[H:128-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-54 Fab heavy chain ; X-RAY DIFFRACTION 3.65Å
e7q0hA2[A:120-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-50 Fab heavy chain ; X-RAY DIFFRACTION 3.65Å
e7q0iH2[H:127-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-43 heavy chain ; ligands: CL ; X-RAY DIFFRACTION 2.386Å
e7q0iA2[A:127-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-43 heavy chain ; ligands: GOL ; X-RAY DIFFRACTION 2.386Å
e7q9fH2[H:119-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-50 heavy chain ; ELECTRON MICROSCOPY
e7q9fE2[E:119-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-50 heavy chain ; ELECTRON MICROSCOPY
e7q9fJ2[J:118-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Beta-50 heavy chain ; ELECTRON MICROSCOPY
e7rd5B2[B:119-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
1C12 Fab Heavy Chain ; X-RAY DIFFRACTION 3.6Å
e7rd5D2[D:119-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
1C12 Fab Heavy Chain ; X-RAY DIFFRACTION 3.6Å
e7rdaH2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
antibody m43.138 heavy chain ; X-RAY DIFFRACTION 1.920Å
e7rdjB2[B:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PCDN-16B Fab heavy chain ; ligands: EDO ; X-RAY DIFFRACTION 1.93Å
e7rdkB2[B:114-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PCDN-16B Fab heavy chain ; ligands: CYS,EDO ; X-RAY DIFFRACTION 2.46Å
e7rdlB2[B:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PCDN-22A Fab heavy chain ; X-RAY DIFFRACTION 2.70Å
e7rdlD2[D:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PCDN-22A Fab heavy chain ; X-RAY DIFFRACTION 2.70Å
e7rdmB2[B:115-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PCDN-38B Fab heavy chain ; ligands: CYS,GOL,PO4 ; X-RAY DIFFRACTION 2.08Å
e7s0bA2[A:122-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-056 Fab Heavy Chain ; X-RAY DIFFRACTION 2.9Å
e7s0bC2[C:122-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-056 Fab Heavy Chain ; X-RAY DIFFRACTION 2.9Å
e7s0cH2[H:124-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-017 Fab Heavy Chain ; ELECTRON MICROSCOPY
e7s0cM2[M:124-225] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-017 Fab Heavy Chain ; ELECTRON MICROSCOPY
e7s0dH2[H:122-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-014 Fab Heavy Chain ; ELECTRON MICROSCOPY
e7s0dM2[M:122-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-014 Fab Heavy Chain ; ELECTRON MICROSCOPY
e7s0dO2[O:122-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-014 Fab Heavy Chain ; ELECTRON MICROSCOPY
e7s0eH2[H:122-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
N-612-004 Fab heavy chain ; ELECTRON MICROSCOPY
e7s11H2[H:115-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.58Å
e7s11I2[I:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.58Å
e7s11J2[J:114-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.58Å
e7s11K2[K:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.58Å
e7s13H2[H:115-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.12Å
e7s13I2[I:114-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fab heavy chain ; X-RAY DIFFRACTION 2.12Å
e7sfxC2[C:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
10A1 Fab heavy chain ; X-RAY DIFFRACTION 3.10Å
e7sfxA2[A:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
10A1 Fab heavy chain ; X-RAY DIFFRACTION 3.10Å
e7sfxG2[G:122-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
10A1 Fab heavy chain ; X-RAY DIFFRACTION 3.10Å
e7sfxJ2[J:123-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
10A1 Fab heavy chain ; X-RAY DIFFRACTION 3.10Å
e7sg4H2[H:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DH1047 Heavy chain ; ELECTRON MICROSCOPY
e7sn1H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
neutralizing antibody C1C-A3 Fab heavy chain ; X-RAY DIFFRACTION 1.467Å
e7sn2H2[H:114-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
neutralizing antibody C1C-A3 Fab heavy chain ; ELECTRON MICROSCOPY
e7v26a2[a:121-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XG005 Heavy chain ; ELECTRON MICROSCOPY
e7v26c2[c:121-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XG005 Heavy chain ; ELECTRON MICROSCOPY
e7v26e2[e:121-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XG005 Heavy chain ; ELECTRON MICROSCOPY
e7vsuD2[D:121-230] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
heavy chain ; X-RAY DIFFRACTION 3.1Å
e7vsuB2[B:121-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
heavy chain ; X-RAY DIFFRACTION 3.1Å
e7vuxH2[H:118-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heavy chain of Fab fragment ; ligands: EDO,GOL,THR ; X-RAY DIFFRACTION 1.64Å
Previouse1hzhH7[H:236-359]
nonrep
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IMMUNOGLOBULIN HEAVY CHAIN ; ligands: BMA,GAL,MAN,NAG ; X-RAY DIFFRACTION 2.70Å
e1hzhH8[H:360-478]
nonrep
Image
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IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 2.70Å
e3rdtC2[C:83-178]
nonrep
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H-2 class II histocompatibility antigen, A-B alpha chain ; X-RAY DIFFRACTION 2.70Å
e1hxmA2[A:121-206]
nonrep
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GAMMA-DELTA T-CELL RECEPTOR ; X-RAY DIFFRACTION 3.00Å
e1hxmB2[B:124-230]
nonrep
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GAMMA-DELTA T-CELL RECEPTOR ; X-RAY DIFFRACTION 3.00Å
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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