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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

e7cdiL1[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

antibody P2C-1F11 light chain ; X-RAY DIFFRACTION 2.96Å

e7ld1N2[N:133-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH1047 light chain ; ELECTRON MICROSCOPY

e7ld1O2[O:133-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH1047 light chain ; ELECTRON MICROSCOPY

e7ld1L2[L:133-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH1047 light chain ; ELECTRON MICROSCOPY

e6zlrLLL2[LLL:114-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CR3022 FAB LIGHT CHAIN ; X-RAY DIFFRACTION 3.09Å

e6zlrCCC1[CCC:114-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CR3022 FAB LIGHT CHAIN ; X-RAY DIFFRACTION 3.09Å

e6zlrGGG1[GGG:114-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CR3022 FAB LIGHT CHAIN ; X-RAY DIFFRACTION 3.09Å

e6vvuF2[F:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab E104.v1 light chain ; X-RAY DIFFRACTION 3.0Å

e6vvuI1[I:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab E104.v1 light chain ; X-RAY DIFFRACTION 3.0Å

e6vvuK2[K:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab E104.v1 light chain ; X-RAY DIFFRACTION 3.0Å

e6vvuL2[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab E104.v1 light chain ; X-RAY DIFFRACTION 3.0Å

e7lkaL1[L:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COV107-23 light chain ; X-RAY DIFFRACTION 1.980Å

e7lkaB1[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COV107-23 light chain ; X-RAY DIFFRACTION 1.980Å

e7b3oL2[L:109-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light Chain of Fab Fragment ; X-RAY DIFFRACTION 2.000Å

e7kqgC2[C:107-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

1272 Fab light chain ; X-RAY DIFFRACTION 2.600Å

e7kqiC1[C:107-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

1209 Fab light chain ; X-RAY DIFFRACTION 4.200Å

e6xobN1[N:107-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EEEV-143 Fab light chain ; ELECTRON MICROSCOPY

e6xobP2[P:107-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EEEV-143 Fab light chain ; ELECTRON MICROSCOPY

e6xobR1[R:107-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EEEV-143 Fab light chain ; ELECTRON MICROSCOPY

e6xobT1[T:107-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EEEV-143 Fab light chain ; ELECTRON MICROSCOPY

e7dpmK2[K:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain of MW06 ; X-RAY DIFFRACTION 3.300Å

e7bscL1[L:131-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

1G5.3 Fab Light Chain ; X-RAY DIFFRACTION 2.30Å

e6vmjA2[A:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab20D12 Light Chain ; X-RAY DIFFRACTION 2.950Å

e6vmjE1[E:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab20D12 Light Chain ; X-RAY DIFFRACTION 2.950Å

e6vmjI2[I:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab20D12 Light Chain ; X-RAY DIFFRACTION 2.950Å

e6vmjL2[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab20D12 Light Chain ; X-RAY DIFFRACTION 2.950Å

e6vmkL2[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkA2[A:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkD1[D:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkG2[G:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkJ2[J:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkO2[O:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkR2[R:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkU1[U:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkY1[Y:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkb2[b:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmke1[e:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkh2[h:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkk2[k:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkn2[n:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkq2[q:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e6vmkt2[t:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab Y49R light chain ; X-RAY DIFFRACTION 3.001Å

e7lkaD2[D:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COV107-23 light chain ; X-RAY DIFFRACTION 1.980Å

e7lkaF1[F:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COV107-23 light chain ; X-RAY DIFFRACTION 1.980Å

e7bsdB1[B:131-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

1G5.3 Fab Light Chain ; X-RAY DIFFRACTION 2.50Å

e7bsdL2[L:131-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

1G5.3 Fab Light Chain ; X-RAY DIFFRACTION 2.50Å

e7chzL1[L:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain of antibody binding fragment of IgG26A ; X-RAY DIFFRACTION 2.48Å

e6v4qL2[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Naive-1 Fab light chain ; ligands: GOL,IPA ; X-RAY DIFFRACTION 1.390Å

e6v4rL2[L:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chimera-1 Fab light chain ; X-RAY DIFFRACTION 3.480Å

e7kfvD2[D:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain of antibody C1A-B3 Fab ; X-RAY DIFFRACTION 2.10Å

e7kfvG2[G:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain of antibody C1A-B3 Fab ; X-RAY DIFFRACTION 2.10Å

e7kfvL2[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

light chain of antibody C1A-B3 Fab ; X-RAY DIFFRACTION 2.10Å

e7jicL1[L:107-212] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Coltuximab Light Chain ; ELECTRON MICROSCOPY

e6wzjB1[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab Light Chain ; X-RAY DIFFRACTION 2.37Å

e6wzjD1[D:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab Light Chain ; X-RAY DIFFRACTION 2.37Å

e6wzkB1[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab light chain ; X-RAY DIFFRACTION 1.80Å

e6wzkD2[D:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab light chain ; X-RAY DIFFRACTION 1.80Å

e6wzlB1[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab light chain ; X-RAY DIFFRACTION 2.29Å

e6wzlD2[D:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab light chain ; X-RAY DIFFRACTION 2.29Å

e6wzmB2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab light chain ; X-RAY DIFFRACTION 2.28Å

e6wzmD2[D:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY3041658 Fab light chain ; X-RAY DIFFRACTION 2.28Å

e6lunB1[B:131-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NN2101 ; X-RAY DIFFRACTION 1.9Å

e6lunD2[D:131-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NN2101 ; X-RAY DIFFRACTION 1.9Å

e6xcjL2[L:113-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH650 Fab Light Chain ; X-RAY DIFFRACTION 2.80Å

e7kraJ1[J:127-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab DH4 light chain ; ELECTRON MICROSCOPY

e7ktxJ1[J:127-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab DH4 light chain ; ELECTRON MICROSCOPY

e7l0nL1[L:109-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody S304 Fab light chain ; ligands: CL ; X-RAY DIFFRACTION 2.780Å

e7l0nN2[N:109-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody S304 Fab light chain ; X-RAY DIFFRACTION 2.780Å

e6yioL1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FAB FRGAMENT LIGHT CHAIN ; X-RAY DIFFRACTION 1.83Å

e7kmiB1[B:109-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LY-CoV481 Fab light chain ; X-RAY DIFFRACTION 1.73Å

e7kgvE2[E:112-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody Fab light chain ; X-RAY DIFFRACTION 3.40Å

e7kgvF1[F:112-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Monoclonal antibody Fab light chain ; X-RAY DIFFRACTION 3.40Å

e7l02K2[K:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2G12 light chain ; ELECTRON MICROSCOPY

e7l06E1[E:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2G12 light chain ; ELECTRON MICROSCOPY

e7l06K1[K:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2G12 light chain ; ELECTRON MICROSCOPY

e7l09K2[K:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2G12 light chain ; ELECTRON MICROSCOPY

e7kzxC1[C:110-202] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab2R light chain ; ELECTRON MICROSCOPY

e7kzxE1[E:110-202] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab2R light chain ; ELECTRON MICROSCOPY

e7kzzE2[E:110-202] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab2R light chain ; ELECTRON MICROSCOPY

e7kzzC2[C:110-202] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab2R light chain ; ELECTRON MICROSCOPY

e6xy2L1[L:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain ; X-RAY DIFFRACTION 2.95Å

e6zvfL2[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chimeric Fab M3/38 (L,H) ; X-RAY DIFFRACTION 1.661Å

e7lm8N1[N:108-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV38-142 Fab light chain ; ligands: EDO ; X-RAY DIFFRACTION 1.936Å

e7czqK1[K:109-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7jtgB2[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH

RM11-43 Fab light chain ; X-RAY DIFFRACTION 2.6Å

e7kzcL2[L:108-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain of m396-B10 antibody ; ligands: CL ; X-RAY DIFFRACTION 2.300Å

e7jlnB1[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

iv9 Light Chain ; X-RAY DIFFRACTION 2.57Å

e7jtfB2[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH

RM2-01 Fab light chain ; X-RAY DIFFRACTION 3.35Å

e6wk4B1[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH

13E2 Fab Light Chain ; ligands: TRS ; X-RAY DIFFRACTION 2.1Å

e6wklB2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

BAP050 Fab Light Chain ; X-RAY DIFFRACTION 1.89Å

e7jlkB2[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

glVRC01 Light Chain ; ligands: CL,EDO,NA,PEG ; X-RAY DIFFRACTION 1.99Å

e6lynB2[B:111-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AA98 Fab light chain ; X-RAY DIFFRACTION 2.776Å

e7eamL1[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

the light chain of Fab fragment of antibody 7D6 ; X-RAY DIFFRACTION 1.40Å

e7kylL1[L:107-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POWV-80 Fab light chain ; X-RAY DIFFRACTION 2.000Å

e6lbhD1[D:113-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; ELECTRON MICROSCOPY

e7bxvL2[L:113-217] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Fab of the 11A1 antibody L chain ; X-RAY DIFFRACTION 1.75Å

e7bepB2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-384 light chain ; X-RAY DIFFRACTION 2.61Å

e7cgwB1[B:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of tislelizumab Fab ; X-RAY DIFFRACTION 3.2Å

e7c88L2[L:130-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JS003 Light chain ; X-RAY DIFFRACTION 1.9960Å

e7luag2[g:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH898.1 light chain ; ELECTRON MICROSCOPY

e7ll1L1[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VRC40.01 Fab Light chain ; ELECTRON MICROSCOPY

e7l5jL1[L:107-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anti mouse norovirus mAb A6.2 Fab light chain ; ELECTRON MICROSCOPY

e7ll2L2[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VRC33.01 Fab Light chain ; ELECTRON MICROSCOPY

e7d0cL1[L:109-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of P5A-3A1 ; ELECTRON MICROSCOPY

e7ljrT1[T:127-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab DH1043 light chain ; ELECTRON MICROSCOPY

e7nx6B1[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-222 Fab light chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.25Å

e7bq5L1[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Z6 Light Chain ; X-RAY DIFFRACTION 2.99Å

e7lopY1[Y:108-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV05-163 Fab light chain ; X-RAY DIFFRACTION 2.246Å

e6u6mL2[L:107-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH840.1 Fab light chain ; X-RAY DIFFRACTION 2.683Å

e6wjlL1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

D3 Fab Light Chain ; X-RAY DIFFRACTION 3.3Å

e6wvzL1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light Chain of anti-MET Fab of amivantamab ; X-RAY DIFFRACTION 3.100Å

e7jwpB2[B:111-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e6wztL1[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cyno antibody light chain ; ELECTRON MICROSCOPY

e6yhqL2[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab F5.18.6 anti-Plasmodium vivax AMA1, kappa light chain ; ligands: SCN,ZN ; X-RAY DIFFRACTION 1.89Å

e7kzaL1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab fragment light chain of anti-CoV2-RBD antibody variant CR3022-B6 ; ligands: GOL ; X-RAY DIFFRACTION 1.690Å

e7nx6L2[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EY6A Fab light chain ; X-RAY DIFFRACTION 2.25Å

e6w73L1[L:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH

HmAb64 fab light chain ; ligands: CA ; X-RAY DIFFRACTION 2.8Å

e7bepL2[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

S309 light chain ; ligands: CL,GLU,GLY ; X-RAY DIFFRACTION 2.61Å

e7duoL2[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH

Fab light chain ; X-RAY DIFFRACTION 2.81Å

e7lopC1[C:108-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CR3022 Fab light chain ; X-RAY DIFFRACTION 2.246Å

e7czxK1[K:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Uncharacterized protein ; ELECTRON MICROSCOPY

e7jr7D2[D:109-213] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Fab 11F4 light chain ; ELECTRON MICROSCOPY

e7nehL1[L:109-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-269 fab light chain ; ligands: EDO,NO3,SO4 ; X-RAY DIFFRACTION 1.77Å

e7belB1[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-45 light chain ; X-RAY DIFFRACTION 2.53Å

e7lm8L1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVA1-16 Fab light chain ; X-RAY DIFFRACTION 1.936Å

e7ntcL2[L:127-232] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

P008_056 Fab Light chain ; ELECTRON MICROSCOPY

e6u6oL2[L:107-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH846 Fab light chain ; X-RAY DIFFRACTION 2.8Å

e7beiL1[L:110-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-150 light chain ; ligands: CL,NO3 ; X-RAY DIFFRACTION 2.3Å

e6wkmL1[L:112-218] Image Pymol Jmol Links: PDB, SCOP, CATH

22D2 Fab Light Chain ; X-RAY DIFFRACTION 2.1Å

e6w51N1[N:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin light chain H2 ; X-RAY DIFFRACTION 3.530Å

e7lseL1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T025 Fab Light Chain ; ligands: GOL ; X-RAY DIFFRACTION 2.350Å

e7eanL1[L:107-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of SARS-CoV-2 cross-neutralizing mAb 6D6 ; X-RAY DIFFRACTION 1.91Å

e6wwcB2[B:113-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

vFP16.02 antibody light chain ; X-RAY DIFFRACTION 2.5Å

e6wx2B1[B:113-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

vFP16.02 antibody light chain ; X-RAY DIFFRACTION 2.39Å

e7kq7L2[L:112-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antibody light chain ; X-RAY DIFFRACTION 2.2Å

e6wlaL12[L1:107-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab ch128.1 light chain ; ligands: GOL ; X-RAY DIFFRACTION 2.600Å

e7czrK1[K:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IGL c4203_light_IGKV1-9_IGKJ4,IGL c4203_light_IGKV1-9_IGKJ4,Uncharacterized protein ; ELECTRON MICROSCOPY

e7dr4D1[D:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

anti-human IL-2 antibody, mouse Ig G, kappa chain ; X-RAY DIFFRACTION 2.49Å

e7benB2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-75 light chain ; ligands: BR,GOL ; X-RAY DIFFRACTION 2.50Å

e6xocB1[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IV4 Fab Light Chain ; ligands: EDO ; X-RAY DIFFRACTION 2.45Å

e7jr7F2[F:109-212] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Fab 2E10 light chain ; ELECTRON MICROSCOPY

e7benL1[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-253 light chain ; X-RAY DIFFRACTION 2.50Å

e7ce2B2[B:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

neutralizing antibody light chain ; X-RAY DIFFRACTION 2.01Å

e6wjuA2[A:113-219] Image Pymol Jmol Links: PDB, SCOP, CATH

4A10 Fab Light Chain ; X-RAY DIFFRACTION 3.1Å

e7czuN1[N:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7czuK2[K:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7czvK2[K:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7czvM2[M:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7czvN1[N:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7lm9L1[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CV38-142 Fab light chain ; ligands: EDO ; X-RAY DIFFRACTION 1.527Å

e7czqN2[N:109-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Immunoglobulin kappa variable 1-33,Uncharacterized protein ; ELECTRON MICROSCOPY

e7kzcD2[D:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain of m396-B10 antibody ; X-RAY DIFFRACTION 2.300Å

e7jtfD1[D:108-212] Image Pymol Jmol Links: PDB, SCOP, CATH

RM2-01 Fab light chain ; X-RAY DIFFRACTION 3.35Å

e6lynL1[L:111-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AA98 Fab light chain ; X-RAY DIFFRACTION 2.776Å

e7eamD2[D:109-214] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

the light chain of Fab fragment of antibody 7D6 ; X-RAY DIFFRACTION 1.40Å

e7kylY2[Y:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POWV-80 Fab light chain ; ligands: CL ; X-RAY DIFFRACTION 2.000Å

e6lbhF2[F:113-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab light chain ; ELECTRON MICROSCOPY

e7bepF2[F:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-384 light chain ; X-RAY DIFFRACTION 2.61Å

e7nd8L1[L:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-384 Fab light chain ; ELECTRON MICROSCOPY

e7c88B2[B:130-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

JS003 Light chain ; X-RAY DIFFRACTION 1.9960Å

e7cgwL1[L:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of tislelizumab Fab ; X-RAY DIFFRACTION 3.2Å

e7luaj1[j:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DH898.1 light chain ; ELECTRON MICROSCOPY

e7ll1F1[F:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VRC40.01 Fab Light chain ; ELECTRON MICROSCOPY

e7ll1K2[K:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VRC40.01 Fab Light chain ; ELECTRON MICROSCOPY

e7dr4B2[B:109-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

anti-human IL-2 antibody, mouse Ig G, kappa chain ; X-RAY DIFFRACTION 2.49Å

e7l5jX1[X:107-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Anti mouse norovirus mAb A6.2 Fab light chain ; ELECTRON MICROSCOPY

e7ll2J2[J:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VRC33.01 Fab Light chain ; ELECTRON MICROSCOPY

e7ll2M1[M:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VRC33.01 Fab Light chain ; ELECTRON MICROSCOPY

e7d0cF2[F:109-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Light chain of P5A-3A1 ; ELECTRON MICROSCOPY

e7nx7B2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-222 Fab light chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.3Å

e7nx8B2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-222 Fab light chain ; ligands: CL,PEG,SO4 ; X-RAY DIFFRACTION 1.95Å

e7nx9B2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-222 Fab light chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.4Å

e7nxaB1[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-222 Fab light chain ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.5Å

e7nxbB2[B:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

COVOX-222 Fab light chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.67Å

e7bq5D1[D:108-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Z6 Light Chain ; X-RAY DIFFRACTION 2.99Å

e6wwcH1[H:113-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

vFP16.02 antibody light chain ; X-RAY DIFFRACTION 2.5Å

e6wx2L1[L:113-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

vFP16.02 antibody light chain ; X-RAY DIFFRACTION 2.39Å

e6wjlJ2[J:108-213] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

D3 Fab Light Chain ; X-RAY DIFFRACTION 3.3Å

e7czxM2[M:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Uncharacterized protein ; ELECTRON MICROSCOPY

e7czxN1[N:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Uncharacterized protein ; ELECTRON MICROSCOPY

e7czyK2[K:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Immunoglobulin kappa constant ; ELECTRON MICROSCOPY

e7czyN2[N:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Immunoglobulin kappa constant ; ELECTRON MICROSCOPY

e7czzK2[K:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Immunoglobulin kappa constant ; ELECTRON MICROSCOPY

e7czzM2[M:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Immunoglobulin kappa constant ; ELECTRON MICROSCOPY

e7czzN1[N:114-220] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IG c168_light_IGKV4-1_IGKJ4,Immunoglobulin kappa constant ; ELECTRON MICROSCOPY

e7lopV2[V:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CR3022 Fab light chain ; X-RAY DIFFRACTION 2.246Å

e7jwpD1[D:111-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwpF2[F:111-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwpH1[H:111-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwpJ1[J:111-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwpL1[L:111-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwpN1[N:111-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwpP2[P:111-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 3Å

e7jwqB1[B:111-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 2Å

e7jwqD1[D:111-215] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fab CJ11 Light chain ; X-RAY DIFFRACTION 2Å

e6wztD2[D:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cyno antibody light chain ; ELECTRON MICROSCOPY

e6wztF2[F:108-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cyno antibody light chain ; ELECTRON MICROSCOPY

e7nx7L1[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EY6A Fab light chain ; X-RAY DIFFRACTION 2.3Å

e7nx9L1[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EY6A Fab light chain ; X-RAY DIFFRACTION 2.4Å

e7nxaL1[L:109-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EY6A Fab light chain ; X-RAY DIFFRACTION 2.5Å

Previous Next

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

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