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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

Keyword search

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

X: Immunoglobulin-like beta-sandwich
H: Immunoglobulin-related
T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like
F: C1-set

PF07654 CL0159

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

e1mjuL2[L:108-214] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IMMUNOGLOBULIN MS6-12 ; ligands: GOL ; X-RAY DIFFRACTION 1.22Å

e1ogaE2[E:119-245] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T-CELL RECEPTOR BETA CHAIN C REGION ; X-RAY DIFFRACTION 1.4Å

e1l6xA1[A:237-341] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

IMMUNOGLOBULIN GAMMA-1 HEAVY CHAIN CONSTANT REGION ; X-RAY DIFFRACTION 1.65Å

e6vcaF2[F:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TB38 light chain ; X-RAY DIFFRACTION 3.730Å

e6vcaJ2[J:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TB38 light chain ; X-RAY DIFFRACTION 3.730Å

e6l9lD1[D:114-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T Cell Receptor ; X-RAY DIFFRACTION 2.3990Å

e6l9lH2[H:114-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T Cell Receptor ; X-RAY DIFFRACTION 2.3990Å

e6vm7E1[E:118-242] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

SILv44 T cell receptor beta chain ; X-RAY DIFFRACTION 2.41Å

e6vm8E1[E:118-242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SILv44 T cell receptor beta chain ; X-RAY DIFFRACTION 2.40Å

e6vm9E1[E:116-241] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

T4H2 T cell receptor beta chain ; X-RAY DIFFRACTION 2.9Å

e6vmaE1[E:116-240] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

T4H2 T cell receptor beta chain ; X-RAY DIFFRACTION 2.75Å

e6vmcE1[E:116-241] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

T4H2 T cell receptor beta chain ; X-RAY DIFFRACTION 2.85Å

e7cm4L1[L:111-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IgG light chain ; ligands: EDO,NI ; X-RAY DIFFRACTION 2.71Å

e6vtuL2[L:108-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH717.1 light chain ; X-RAY DIFFRACTION 2.610Å

e6lxiL1[L:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3 Fab ; X-RAY DIFFRACTION 2.4990Å

e6lxiD2[D:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3 Fab ; X-RAY DIFFRACTION 2.4990Å

e6lxjL2[L:112-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3 Fab ; X-RAY DIFFRACTION 2.90Å

e6lxjF1[F:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3 Fab ; X-RAY DIFFRACTION 2.90Å

e6lxjK1[K:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3 Fab ; X-RAY DIFFRACTION 2.90Å

e6lxjN1[N:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3 Fab ; X-RAY DIFFRACTION 2.90Å

e6lxkL1[L:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3-D102R Fab ; X-RAY DIFFRACTION 3.60Å

e6lxkF2[F:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3-D102R Fab ; X-RAY DIFFRACTION 3.60Å

e6lxkK2[K:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of Z2B3-D102R Fab ; X-RAY DIFFRACTION 3.60Å

e6ldxL1[L:111-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; X-RAY DIFFRACTION 1.80Å

e6ldyB1[B:113-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; X-RAY DIFFRACTION 1.77Å

e6ldyL2[L:113-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; X-RAY DIFFRACTION 1.77Å

e6x1sL2[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC1-1 Light chain ; X-RAY DIFFRACTION 1.65Å

e6x1sB2[B:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC1-1 Light chain ; X-RAY DIFFRACTION 1.65Å

e6x1sD1[D:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC1-1 Light chain ; X-RAY DIFFRACTION 1.65Å

e6x1sF1[F:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC1-1 Light chain ; X-RAY DIFFRACTION 1.65Å

e6x1tL1[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC50-3 Light chain ; X-RAY DIFFRACTION 2.34Å

e6x1tB2[B:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC50-3 Light chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.34Å

e6x1tD1[D:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC50-3 Light chain ; X-RAY DIFFRACTION 2.34Å

e6x1tF2[F:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC50-3 Light chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.34Å

e6x1tI1[I:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC50-3 Light chain ; X-RAY DIFFRACTION 2.34Å

e6x1tK1[K:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC50-3 Light chain ; X-RAY DIFFRACTION 2.34Å

e6w52L2[L:108-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RSB1 Fab Light Chain ; X-RAY DIFFRACTION 3.74Å

e6w5dL2[L:108-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RSB1 Fab Light Chain ; X-RAY DIFFRACTION 2Å

e6w5dB2[B:108-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RSB1 Fab Light Chain ; X-RAY DIFFRACTION 2Å

e6wm9C2[C:117-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

237235 Fab light chain ; X-RAY DIFFRACTION 2.450Å

e6wm9F2[F:117-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

237235 Fab light chain ; X-RAY DIFFRACTION 2.450Å

e6wnoC2[C:117-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

243244 Fab light chain ; X-RAY DIFFRACTION 3.350Å

e6wnoF1[F:117-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

243244 Fab light chain ; X-RAY DIFFRACTION 3.350Å

e7lfnB1[B:240-341] Image Pymol Jmol Links: PDB, SCOP, CATH

IgG1 Fc (Fc267_329) ; X-RAY DIFFRACTION 2.60Å

e7jg1A1[A:338-445] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ELECTRON MICROSCOPY

e7jg1B1[B:338-460] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ligands: NAG ; ELECTRON MICROSCOPY

e7jg1C1[C:338-445] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ELECTRON MICROSCOPY

e7jg2A2[A:338-445] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ligands: NAG ; ELECTRON MICROSCOPY

e7jg2B1[B:338-460] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ELECTRON MICROSCOPY

e7jg2C1[C:338-445] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ligands: NAG ; ELECTRON MICROSCOPY

e7jg2D1[D:338-445] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ELECTRON MICROSCOPY

e7jg1D2[D:338-464] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Igh protein ; ligands: NAG ; ELECTRON MICROSCOPY

e6xjaA1[A:343-450] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e6xjaB1[B:343-450] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant alpha 1 ; ELECTRON MICROSCOPY

e7k0cA2[A:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cB2[B:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cK1[K:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cL2[L:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cI1[I:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cJ1[J:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cE2[E:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cH2[H:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cG2[G:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7k0cF1[F:345-446] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy constant mu ; ELECTRON MICROSCOPY

e7dc7B2[B:109-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

D12 Fab light chain ; X-RAY DIFFRACTION 1.770Å

e7l2cL1[L:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-51 light chain ; ligands: CA ; X-RAY DIFFRACTION 3.44Å

e7l2cD2[D:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-51 light chain ; ligands: CA,PGE ; X-RAY DIFFRACTION 3.44Å

e7dc8A1[A:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Switch Ab Fab light chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.750Å

e7dc8D2[D:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Switch Ab Fab light chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.750Å

e7dm1C2[C:116-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain ; X-RAY DIFFRACTION 2.070Å

e7dm1E1[E:116-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain ; X-RAY DIFFRACTION 2.070Å

e6vslA1[A:235-339] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin gamma-1 heavy chain ; ligands: MPD ; X-RAY DIFFRACTION 2.1Å

e6vslB1[B:237-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin gamma-1 heavy chain ; ligands: MPD ; X-RAY DIFFRACTION 2.1Å

e6vszA2[A:236-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin gamma-1 heavy chain ; X-RAY DIFFRACTION 2.6Å

e6vszB1[B:236-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin gamma-1 heavy chain ; X-RAY DIFFRACTION 2.6Å

e7dm2L1[L:115-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain ; X-RAY DIFFRACTION 2.050Å

e6x1uL1[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC39-4 Light chain ; ligands: EDO ; X-RAY DIFFRACTION 1.64Å

e6x1uB1[B:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC39-4 Light chain ; ligands: ACT ; X-RAY DIFFRACTION 1.64Å

e6ldvL1[L:112-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; X-RAY DIFFRACTION 1.90Å

e6ldwL1[L:111-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; X-RAY DIFFRACTION 1.60Å

e6ldwA1[A:111-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; X-RAY DIFFRACTION 1.60Å

e6x1vL2[L:109-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC44-8 Light chain ; X-RAY DIFFRACTION 2.11Å

e6x1wL2[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SC56-2 Light chain ; X-RAY DIFFRACTION 1.95Å

e6wixL2[L:109-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

3H109L Fab light chain ; X-RAY DIFFRACTION 2.560Å

e7lblA2[A:237-341] Image Pymol Jmol Links: PDB, SCOP, CATH

Ig gamma-1 chain C region ; X-RAY DIFFRACTION 2.13Å

e7lblB2[B:237-341] Image Pymol Jmol Links: PDB, SCOP, CATH

Ig gamma-1 chain C region ; X-RAY DIFFRACTION 2.13Å

e7lf5A1[A:238-341] Image Pymol Jmol Links: PDB, SCOP, CATH

IgG1 Fc (Fc267) ; X-RAY DIFFRACTION 2.60Å

e6vjnL1[L:108-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

D11A.B5 Fab Light chain ; X-RAY DIFFRACTION 2.0Å

e6wtuL2[L:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

273264 Fab light chain ; X-RAY DIFFRACTION 2.540Å

e6wtuI1[I:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

273264 Fab light chain ; X-RAY DIFFRACTION 2.540Å

e6wtuC2[C:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

273264 Fab light chain ; X-RAY DIFFRACTION 2.540Å

e6wtuF2[F:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

273264 Fab light chain ; X-RAY DIFFRACTION 2.540Å

e6wtvC2[C:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

258259 Fab light chain ; X-RAY DIFFRACTION 3.050Å

e6wtvL2[L:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

258259 Fab light chain ; X-RAY DIFFRACTION 3.050Å

e6wtvF1[F:115-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

258259 Fab light chain ; X-RAY DIFFRACTION 3.050Å

e6wtvI2[I:115-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

258259 Fab light chain ; X-RAY DIFFRACTION 3.050Å

e7cacD2[D:108-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of H014 Fab ; ELECTRON MICROSCOPY

e7khfL2[L:110-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MDB1 Fab light chain ; ELECTRON MICROSCOPY

e7laaL2[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH1041 light chain ; ELECTRON MICROSCOPY

e7behL1[L:112-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-316 light chain ; ligands: GOL ; X-RAY DIFFRACTION 2.30Å

e7czwL2[L:113-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGL c2312_light_IGLV2-14_IGLJ2,IGL@ protein ; ELECTRON MICROSCOPY

e7bydE1[E:121-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SN45 T cell receptor beta chain ; ligands: IOD ; X-RAY DIFFRACTION 2.8Å

e7lsbD1[D:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH

B1 Fab light chain ; X-RAY DIFFRACTION 2.49Å

e7lsiC1[C:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH

KD035 Fab light chain ; X-RAY DIFFRACTION 1.99Å

e7kfgB2[B:110-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody Fab BDBV-289 light chain ; X-RAY DIFFRACTION 3.00Å

e7cr5L1[L:113-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

monoclonal antibody chain L ; X-RAY DIFFRACTION 2.08Å

e7ly3C2[C:110-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

S2M28 Fab Light Chain ; X-RAY DIFFRACTION 3.0Å

e6whkB1[B:112-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Light Chain ; X-RAY DIFFRACTION 2.600Å

e6xqwL1[L:113-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MaliM03 Fab Light Chain ; X-RAY DIFFRACTION 2.99Å

e7d85C2[C:112-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anti-ErbB3 Fab light chain ; X-RAY DIFFRACTION 2.5Å

e7cztL2[L:117-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c689_light_IGLV5-37_IGLJ3,IGL@ protein ; ELECTRON MICROSCOPY

e6wasL2[L:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GN1_PA8 Fab Light chain ; X-RAY DIFFRACTION 1.90Å

e6witL2[L:108-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NHP GN1-SD7 Fab Light Chain ; X-RAY DIFFRACTION 2.79Å

e7khfB1[B:110-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MDB1 Fab light chain ; ELECTRON MICROSCOPY

e7czwN2[N:113-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGL c2312_light_IGLV2-14_IGLJ2,IGL@ protein ; ELECTRON MICROSCOPY

e7d03L2[L:113-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGL c2312_light_IGLV2-14_IGLJ2,IGL@ protein ; ELECTRON MICROSCOPY

e7bydJ2[J:121-245] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SN45 T cell receptor beta chain ; ligands: IOD ; X-RAY DIFFRACTION 2.8Å

e7czpL1[L:112-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c181_light_IGLV2-14_IGLJ3,IGL@ protein ; ELECTRON MICROSCOPY

e7czpN1[N:112-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c181_light_IGLV2-14_IGLJ3,IGL@ protein ; ELECTRON MICROSCOPY

e7lsiD2[D:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH

KD035 Fab light chain ; X-RAY DIFFRACTION 1.99Å

e7ly3E1[E:110-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

S2M28 Fab Light Chain ; X-RAY DIFFRACTION 3.0Å

e7d85F1[F:112-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anti-ErbB3 Fab light chain ; X-RAY DIFFRACTION 2.5Å

e7cztM2[M:117-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c689_light_IGLV5-37_IGLJ3,IGL@ protein ; ELECTRON MICROSCOPY

e6wasB2[B:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GN1_PA8 Fab Light chain ; X-RAY DIFFRACTION 1.90Å

e6witB1[B:108-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NHP GN1-SD7 Fab Light Chain ; X-RAY DIFFRACTION 2.79Å

e7m7wB2[B:115-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody S2X259 Fab light chain ; X-RAY DIFFRACTION 2.650Å

e7choL2[L:113-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

antibody P5A-1D2 light chain ; X-RAY DIFFRACTION 2.56Å

e7m7wD2[D:114-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody S2H97 Fab light chain ; X-RAY DIFFRACTION 2.650Å

e7m3iB1[B:110-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV2-75 Fab Light chain ; X-RAY DIFFRACTION 2.8Å

e7o9sL1[L:110-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab nnHTN-Gn2 Light chain ; X-RAY DIFFRACTION 2.700Å

e7dk0B1[B:109-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MW05 light chain ; X-RAY DIFFRACTION 3.199Å

e7nksD1[D:114-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab HTN-Gn1 light chain ; X-RAY DIFFRACTION 3.5Å

e6ztdL2[L:111-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of the Fab fragment from BCR derived from the P6540 CLL clone ; X-RAY DIFFRACTION 3.43Å

e7mf1L2[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

47D1 Fab light chain ; X-RAY DIFFRACTION 2.0920Å

e7e7xL2[L:112-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

N11 Fab Light chain ; X-RAY DIFFRACTION 2.78Å

e7e7yB1[B:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BD-623 Fab L ; X-RAY DIFFRACTION 2.41Å

e6x58D2[D:111-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

10E8v4 Fab Light Chain ; X-RAY DIFFRACTION 3.260Å

e6yxmLLL2[LLL:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ACPA 1F2 Fab fragment - light chain ; ligands: ZN ; X-RAY DIFFRACTION 2.85Å

e7jz1L1[L:113-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MGC34 light chain ; X-RAY DIFFRACTION 3.350Å

e7lmnA1[A:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 2.01Å

e7kqeL1[L:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab 3D11 light chain ; ELECTRON MICROSCOPY

e7m7wL1[L:115-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody S2X259 Fab light chain ; X-RAY DIFFRACTION 2.650Å

e7choC2[C:113-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

antibody P5A-1D2 light chain ; X-RAY DIFFRACTION 2.56Å

e7m7wF1[F:114-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody S2H97 Fab light chain ; X-RAY DIFFRACTION 2.650Å

e7m3iL1[L:110-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV2-75 Fab Light chain ; X-RAY DIFFRACTION 2.8Å

e7nksL1[L:114-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab HTN-Gn1 light chain ; X-RAY DIFFRACTION 3.5Å

e7nrhL2[L:114-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab fragment HTN-Gn1 Light chain ; ELECTRON MICROSCOPY

e7jwjE2[E:133-257] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

B17.C1 TCR beta chain ; X-RAY DIFFRACTION 3.25Å

e7jwiE2[E:131-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

B17.R2 TCR beta chain ; X-RAY DIFFRACTION 3.02Å

e7e7xN1[N:112-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

N11 Fab Light chain ; X-RAY DIFFRACTION 2.78Å

e7e7yD1[D:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BD-623 Fab L ; X-RAY DIFFRACTION 2.41Å

e7kmdE2[E:111-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

35O22 Light chain ; X-RAY DIFFRACTION 3.39Å

e7kmdL2[L:109-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

124 Light chain ; X-RAY DIFFRACTION 3.39Å

e6x58B1[B:111-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

10E8v4 Fab Light Chain ; X-RAY DIFFRACTION 3.260Å

e6zjgLLL2[LLL:112-214] Image Pymol Jmol Links: PDB, SCOP, CATH

ACPA E4 Fab fragment - light chain ; X-RAY DIFFRACTION 2.45Å

e7kqeM1[M:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab 3D11 light chain ; ELECTRON MICROSCOPY

e7kqeN1[N:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab 3D11 light chain ; ELECTRON MICROSCOPY

e7lmnB2[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 2.01Å

e7lmoA1[A:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 1.99Å

e7lmoB1[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 1.99Å

e7lmpA2[A:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 2.29Å

e7lmpB1[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 2.29Å

e7lmqA2[A:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 1.91Å

e7lmqB1[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 1.91Å

e7lmrA1[A:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 2.09Å

e7lmrB1[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JTO light chain ; ligands: PO4 ; X-RAY DIFFRACTION 2.09Å

e7m7bL2[L:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody Fab 3D11 light chain ; ELECTRON MICROSCOPY

e6xlzL1[L:108-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NHP_D11A.F2_Fab_Light_Chain ; ligands: BU3,SO4 ; X-RAY DIFFRACTION 2.8Å

e7mxiA2[A:335-435] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IgE Fc ; X-RAY DIFFRACTION 2.8Å

e7mf7L2[L:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.0Å

e7r6wL2[L:115-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light Chain of Fab domain of monoclonal antibody S2X35 ; ligands: SO4 ; X-RAY DIFFRACTION 1.830Å

e7m42A2[A:113-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REGN10989 antibody Fab fragment light chain ; ELECTRON MICROSCOPY

e7m42C2[C:114-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REGN10985 antibody Fab fragment light chain ; ELECTRON MICROSCOPY

e7mxiA1[A:436-545] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IgE Fc ; X-RAY DIFFRACTION 2.8Å

e7lfaD2[D:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab 3B6 light chain ; ligands: CL ; X-RAY DIFFRACTION 1.857Å

e7n3fL2[L:115-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C080 Fab Light Chain ; X-RAY DIFFRACTION 1.900Å

e7lywB2[B:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-25 Fab Light Chain ; X-RAY DIFFRACTION 2.51Å

e7mxiB2[B:335-435] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IgE Fc ; X-RAY DIFFRACTION 2.8Å

e7e3oL2[L:113-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

nCoV617 Light Chain ; X-RAY DIFFRACTION 2.51Å

e7kn4L2[L:110-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

S-E6 Fab light chain ; X-RAY DIFFRACTION 2.697Å

e7kn4N2[N:110-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

S-E6 Fab light chain ; X-RAY DIFFRACTION 2.697Å

e7lfaL2[L:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab 3B6 light chain ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.857Å

e7lq7D2[D:109-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV503 light chain ; X-RAY DIFFRACTION 3.400Å

e7lq7G2[G:109-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV503 light chain ; X-RAY DIFFRACTION 3.400Å

e7lq7L2[L:109-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV503 light chain ; X-RAY DIFFRACTION 3.400Å

e7lywD2[D:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-25 Fab Light Chain ; X-RAY DIFFRACTION 2.51Å

e7lywL2[L:108-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2-25 Fab Light Chain ; X-RAY DIFFRACTION 2.51Å

e7mf7B2[B:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.0Å

e7mf7D2[D:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.0Å

e7mf7F2[F:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.0Å

e7mf8L2[L:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.200Å

e7mf9L2[L:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 3.69Å

e7mf9D2[D:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 3.69Å

e7mf9I2[I:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 3.69Å

e7mf9N2[N:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 3.69Å

e7mf9R2[R:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 3.69Å

e7mfaL2[L:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.39Å

e7mfaD2[D:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.39Å

e7mfaI2[I:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.39Å

e7mfaN2[N:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.39Å

e7mfaR2[R:109-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.39Å

e7mfaV2[V:112-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 2.39Å

e7mfbL2[L:110-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody 10E8v4 Fab light chain ; X-RAY DIFFRACTION 1.74Å

Previous Next

e1l6xA2[A:342-443] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

IMMUNOGLOBULIN GAMMA-1 HEAVY CHAIN CONSTANT REGION ; X-RAY DIFFRACTION 1.65Å

e1rzfL2[L:109-210] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FAB E51 LIGHT CHAIN ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å

e2h26A1[A:184-279] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T-CELL SURFACE GLYCOPROTEIN CD1B ; ligands: GOL ; X-RAY DIFFRACTION 1.8Å

e1uvqA1[A:85-183] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HLA CLASS II HISTOCOMPATIBILITY ANTIGEN ; ligands: GLY,NAG ; X-RAY DIFFRACTION 1.800Å

e1uvqB1[B:95-191] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HLA CLASS II HISTOCOMPATIBILITY ANTIGEN ; X-RAY DIFFRACTION 1.800Å

e1u58A1[A:145-242] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MHC-I HOMOLOG M144 ; X-RAY DIFFRACTION 1.9Å

e2fbjH2[H:119-220] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

IGA-KAPPA J539 FAB (HEAVY CHAIN) ; X-RAY DIFFRACTION 1.95Å

e3fruA1[A:179-269] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NEONATAL FC RECEPTOR ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 2.2Å

e1dn0B2[B:121-225] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

IGM-KAPPA COLD AGGLUTININ (HEAVY CHAIN) ; X-RAY DIFFRACTION 2.28Å

e1fp5A1[A:336-438] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGE HEAVY CHAIN EPSILON-1 ; X-RAY DIFFRACTION 2.3Å

e1fp5A2[A:439-543] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGE HEAVY CHAIN EPSILON-1 ; X-RAY DIFFRACTION 2.3Å

e1hdmA1[A:94-196] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (CLASS II HISTOCOMPATIBILITY ANTIGEN, M ALPHA CHAIN) ; X-RAY DIFFRACTION 2.5Å

e1hdmB1[B:88-185] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (CLASS II HISTOCOMPATIBILITY ANTIGEN, M BETA CHAIN) ; X-RAY DIFFRACTION 2.5Å

e3pl6A2[A:83-180] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MHC class II HLA-DQ-alpha chain ; ligands: NAG ; X-RAY DIFFRACTION 2.55Å

e1o0vA1[A:228-330] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin heavy chain epsilon-1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.6Å

e1hyrC1[C:181-274] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

MHC CLASS I CHAIN-RELATED PROTEIN A ; X-RAY DIFFRACTION 2.7Å

e1hzhH6[H:114-235] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 2.70Å

e1hzhH7[H:236-359] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IMMUNOGLOBULIN HEAVY CHAIN ; ligands: BMA,GAL,MAN,NAG ; X-RAY DIFFRACTION 2.70Å

e1hzhH8[H:360-478] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IMMUNOGLOBULIN HEAVY CHAIN ; X-RAY DIFFRACTION 2.70Å

e3rdtC2[C:83-178] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

H-2 class II histocompatibility antigen, A-B alpha chain ; X-RAY DIFFRACTION 2.70Å

e1hxmA2[A:121-206] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-DELTA T-CELL RECEPTOR ; X-RAY DIFFRACTION 3.00Å

e1hxmB2[B:124-230] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-DELTA T-CELL RECEPTOR ; X-RAY DIFFRACTION 3.00Å

e1zvoC2[C:130-234] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin delta heavy chain ; SOLUTION SCATTERING

e1zvoC5[C:398-512] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin delta heavy chain ; SOLUTION SCATTERING

F: Unmapped domains

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

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

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