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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

alpha bundlesalpha-helix bundles with mainly parallel helices

alpha superhelicesrepeating alpha-helix hairpins form a superhelix

alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain

alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix

beta barrelssingle beta-sheet folded upon itself to form a barrel

beta meanderssingle beta-sheet with mainly meander topology

beta sandwichestwo beta-sheets stacked together to form a sandwich

beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain

beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander

a+b two layersone alpha-helix layer and one beta-sheet layer

X: Ribosomal protein L31e-like
H: Ribosomal protein L31e/gp120 outer domain
T: Ribosomal protein L31e/gp120 outer domain
F: GP120

PF00516

Representatives:

e2nxyA2[A:256-473] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 ; ligands: HEZ,NAG,TRS ; X-RAY DIFFRACTION 2.000Å

e4i3rG1[G:252-481] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Outer domain of HIV-1 gp120 (KER2018 OD4.2.2) ; ligands: NAG ; X-RAY DIFFRACTION 3.000Å

e6ce0G1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG ; X-RAY DIFFRACTION 4.6Å

e6meoG2[G:256-469] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: A2G,MAN,NAG ; ELECTRON MICROSCOPY

e6metG1[G:256-469] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: A2G,MAN,NAG ; ELECTRON MICROSCOPY

e6mtjG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: 83G,NAG ; X-RAY DIFFRACTION 2.330Å

e6d2pC1[C:1-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Germline-targeting HIV-1 gp120 engineered outer domain eOD-GT8 ; ligands: GOL ; X-RAY DIFFRACTION 2.60Å

e6mufG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG ; X-RAY DIFFRACTION 2.900Å

e6mtnG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: JYJ,NAG ; X-RAY DIFFRACTION 2.500Å

e6mu6G1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: JYV,NAG ; X-RAY DIFFRACTION 2.550Å

e6mu7G2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: JYY,NAG ; X-RAY DIFFRACTION 2.500Å

e6mu8G1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: JYS,NAG ; X-RAY DIFFRACTION 2.990Å

e6mugG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: JYS,NAG ; X-RAY DIFFRACTION 2.930Å

e6e5pA3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6e5pC1[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6e5pE1[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nm6G2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; X-RAY DIFFRACTION 2.700Å

e6mcoG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Surface protein gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.50Å

e4r2gE1[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Surface protein gp160 ; ligands: CL,NAG ; X-RAY DIFFRACTION 3.283Å

e6nnfG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; X-RAY DIFFRACTION 2.760Å

e6nnjG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; X-RAY DIFFRACTION 2.600Å

e6mn7A3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope Glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6mn7C3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope Glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6mn7D3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope Glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6mdtG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Surface protein gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.80Å

e6nqdA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T/F100 Env gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nqdE3[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T/F100 Env gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nqdI2[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

T/F100 Env gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ieqG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; X-RAY DIFFRACTION 3.90Å

e6ohyA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: FUC,MAN,NAG ; ELECTRON MICROSCOPY

e6okpD3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: BMA,NAG ; ELECTRON MICROSCOPY

e6ohyC1[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: FUC,MAN,NAG ; ELECTRON MICROSCOPY

e6ohyD3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: FUC,MAN,NAG ; ELECTRON MICROSCOPY

e6okpE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: BMA,NAG ; ELECTRON MICROSCOPY

e6okpF1[F:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: BMA,NAG ; ELECTRON MICROSCOPY

e6ornG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ornK1[K:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ornR1[R:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6oroB1[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6oroG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6oroI3[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6orpB3[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6orpG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6orpI1[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6orqB1[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6orqG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6orqI1[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc3A1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc3C3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc3D3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc3E3[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc3F1[F:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc3G3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc2A3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc2C2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc2D3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc2E1[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc2F3[F:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nc2G2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 v4.2 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mpgV1[V:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6n1vB2[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6n1vA3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6n1vC1[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mpg22[2:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mpgC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mphA3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mphB1[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mphC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6n1w22[2:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6n1wC3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6n1wc2[c:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nf2A2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nf2G3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nf2Q2[Q:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6osy23[2:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6osyB1[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6osyK3[K:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nijA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 Glycoprotein 120 ; ELECTRON MICROSCOPY

e6nijC3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 Glycoprotein 120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nijE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AMC011 Glycoprotein 120 ; ELECTRON MICROSCOPY

e6olpA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6olpC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6olpE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ot1G3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ot1E3[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ot1P1[P:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6mfpG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

clade A/E 93TH057 HIV-1 gp120 core ; ligands: NAG ; X-RAY DIFFRACTION 3.000Å

e6mg7G2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

clade A/E 93TH057 HIV-1 gp120 core ; ligands: NAG ; X-RAY DIFFRACTION 2.900Å

e6mfpA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

clade A/E 93TH057 HIV-1 gp120 core ; ligands: NAG ; X-RAY DIFFRACTION 3.000Å

e5te7G1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 gp120 core ; ligands: EDO,NAG ; X-RAY DIFFRACTION 2.150Å

e4i53A2[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 glycoprotein ; ligands: 1C1,NAG ; X-RAY DIFFRACTION 2.5Å

e4i53B1[B:256-422,B:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 glycoprotein ; ligands: 1C1,NAG ; X-RAY DIFFRACTION 2.5Å

e4lstG2[G:256-422,G:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 OF HIV-1 CLADE C ; ligands: NAG ; X-RAY DIFFRACTION 2.55Å

e4lsvG2[G:256-422,G:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 ; ligands: NAG ; X-RAY DIFFRACTION 3.0Å

e3tgrA1[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C1086 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 2.800Å

e3tgrB1[B:256-422,B:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C1086 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 2.800Å

e3tgsA1[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C1086 gp120 core ; ligands: 03G,NAG ; X-RAY DIFFRACTION 2.7Å

e3tgsB2[B:256-422,B:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C1086 gp120 core ; ligands: 03G,NAG ; X-RAY DIFFRACTION 2.7Å

e5f4lA2[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VE ; X-RAY DIFFRACTION 2.7Å

e5f4lB1[B:256-422,B:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VE ; X-RAY DIFFRACTION 2.7Å

e5f4pD1[D:256-422,D:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VG,NAG ; X-RAY DIFFRACTION 2.5Å

e5f4pA2[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VG,NAG ; X-RAY DIFFRACTION 2.5Å

e5f4rA1[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VF,NAG ; X-RAY DIFFRACTION 2.8Å

e5f4rC2[C:256-422,C:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VF,NAG ; X-RAY DIFFRACTION 2.8Å

e5f4uA1[A:256-422,A:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VH,NAG ; X-RAY DIFFRACTION 3.1Å

e5f4uB2[B:256-422,B:444-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; ligands: 5VH,NAG ; X-RAY DIFFRACTION 3.1Å

e4r4hA1[A:256-300,A:326-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env gp120 ; ligands: NAG ; X-RAY DIFFRACTION 4.28Å

e5f6jG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; X-RAY DIFFRACTION 6.63Å

e5f6jE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENVELOPE GLYCOPROTEIN GP120 of HIV-1 clade C ; X-RAY DIFFRACTION 6.63Å

e5fa2A2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

gp120 ; ligands: FLC,NAG,SCN ; X-RAY DIFFRACTION 1.810Å

e5fa2B2[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

gp120 ; ligands: FLC,NAG ; X-RAY DIFFRACTION 1.810Å

e5igxG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM1deltaV1-3 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.390Å

e5fecC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM4deltaV1-3 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.170Å

e5fecD2[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM4deltaV1-3 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.170Å

e5fecG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM4deltaV1-3 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.170Å

e5fecI1[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM4deltaV1-3 gp120 ; ligands: NAG ; X-RAY DIFFRACTION 3.170Å

e5i9qA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM4dV1-3 p120 ; ligands: EDO,NAG ; X-RAY DIFFRACTION 2.990Å

e5i9qG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

426c.TM4dV1-3 p120 ; ligands: EDO,NAG ; X-RAY DIFFRACTION 2.990Å

e6mftG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gp120 ; ligands: NAG,PEG ; X-RAY DIFFRACTION 2.315Å

e6mftC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gp120 ; ligands: CIT,EDO,NAG ; X-RAY DIFFRACTION 2.315Å

e3tihA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C ZM109F.PB4 gp120 ; X-RAY DIFFRACTION 4.0Å

e3tihB2[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C ZM109F.PB4 gp120 ; X-RAY DIFFRACTION 4.0Å

e3tihC1[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C ZM109F.PB4 gp120 ; X-RAY DIFFRACTION 4.0Å

e3tihD1[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 clade C ZM109F.PB4 gp120 ; X-RAY DIFFRACTION 4.0Å

e6udaA3[A:256-471] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH505.N279K.G458Y.SOSIP.664 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udaE2[E:256-471] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH505.N279K.G458Y.SOSIP.664 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udaI2[I:256-471] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH505.N279K.G458Y.SOSIP.664 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6onfA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

clade A/E 93TH057 HIV-1 gp120 core ; ligands: MW4,NAG ; X-RAY DIFFRACTION 1.84Å

e6oneA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

clade A/E 93TH057 HIV-1 gp120 core ; ligands: MVY,NAG ; X-RAY DIFFRACTION 2.2Å

e6onhA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 LM/HT Clade A/E CRF01 gp120 ; ligands: MWD,NAG ; X-RAY DIFFRACTION 2.24Å

e6p9nA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 LM/HT Clade A/E CRF01 gp120 ; ligands: NAG,O51 ; X-RAY DIFFRACTION 2.65Å

e6onvA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 LM/HT Clade A/E CRF01 gp120 ; ligands: MWA,NAG ; X-RAY DIFFRACTION 3.25Å

e6dfgA1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6dfgC3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6dfgD3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6dfhA3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6dfhC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6dfhD2[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nf5A1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 MD64 N332-GT5 SOSIP gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nf5C3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 MD64 N332-GT5 SOSIP gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nf5J3[J:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 MD64 N332-GT5 SOSIP gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6nfcA3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 MD64 N332-GT5 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nfcE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 MD64 N332-GT5 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6nfcF2[F:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 MD64 N332-GT5 SOSIP gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6p8nC1[C:3-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Env outer domain eOD-GT8 ; ligands: NAG,NH4 ; X-RAY DIFFRACTION 3.20Å

e6p8nA1[A:2-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Env outer domain eOD-GT8 ; X-RAY DIFFRACTION 3.20Å

e6p62A2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 NFL TD+ ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6p62B2[B:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 NFL TD+ ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6p62E2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 Env BG505 NFL TD+ ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6p8mC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gp120 ; ligands: CL,EDO,MAN,NA,NAG,NH4 ; X-RAY DIFFRACTION 3.59Å

e6u0lB1[B:256-297,B:330-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6u0lA2[A:256-297,A:330-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6u0lC1[C:256-297,C:330-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6u0nA1[A:256-297,A:330-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6u0nB2[B:256-297,B:330-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6u0nC1[C:256-297,C:330-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6um5A3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH848 10.17 DT gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um5E3[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH848 10.17 DT gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um5I1[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH848 10.17 DT gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um6A2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH848 10.17DT gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um6E2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH848 10.17DT gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um6I3[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CH848 10.17DT gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um7A1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um7E2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6um7I2[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udjG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udjJ1[J:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udjP1[P:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6u59A1[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SOSIP.664 gp120,SOSIP.664 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6u59C1[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SOSIP.664 gp120,SOSIP.664 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6u59G3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SOSIP.664 gp120,SOSIP.664 gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udkG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6udkK1[K:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6udkR2[R:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RC1 variant of HIV-1 Env glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v8xA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v8xE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v8xI2[I:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v8zA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v8zG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v8zM3[M:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6pwuA2[A:259-468] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: FUC,NAG ; ELECTRON MICROSCOPY

e6pwuC2[C:259-468] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG ; ELECTRON MICROSCOPY

e6pwuE3[E:259-468] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: BMA,NAG ; ELECTRON MICROSCOPY

e6vrwG3[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6vrwA3[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6vrwD1[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6oooA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 LM/HT Clade A/E CRF01 gp120 ; ligands: MXJ,NAG ; X-RAY DIFFRACTION 2.4Å

e6opaG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG ; X-RAY DIFFRACTION 4.08Å

e6vttG1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6v0rA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 SOSIPv5.2 gp120 ; ligands: FUC,NAG ; ELECTRON MICROSCOPY

e6v0rC3[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 SOSIPv5.2 gp120 ; ligands: FUC,NAG ; ELECTRON MICROSCOPY

e6v0rD3[D:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BG505 SOSIPv5.2 gp120 ; ligands: FUC,NAG ; ELECTRON MICROSCOPY

e6vttF2[F:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6vttE1[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6w03G1[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG ; X-RAY DIFFRACTION 2.37Å

e6vziG2[G:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG ; X-RAY DIFFRACTION 2.700Å

e6vpxA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6vpxE1[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6vpxC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp120 ; ligands: MAN,NAG ; ELECTRON MICROSCOPY

e6ulcA2[A:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

envelope glycoprotein gp120,envelope glycoprotein gp120 ; ligands: FUC,NAG ; ELECTRON MICROSCOPY

e6ulcC2[C:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

envelope glycoprotein gp120,envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

e6ulcE2[E:256-473] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

envelope glycoprotein gp120,envelope glycoprotein gp120 ; ligands: NAG ; ELECTRON MICROSCOPY

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e4tvpG1[G:256-473] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; ligands: NAG,SO4 ; X-RAY DIFFRACTION 3.1Å

e4rfnG1[G:256-473] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV-1 CLADE A/E 93TH057 (H375S) GP120 ; ligands: NAG ; X-RAY DIFFRACTION 3.17Å

e3tygA1[A:60-185,A:1-39] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Envelope glycoprotein gp160 ; X-RAY DIFFRACTION 3.25Å

circular permutation

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

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