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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: OB-fold
H: Bacterial enterotoxins
T: Bacterial enterotoxins
F: Enterotoxin_b

PF01376 CL0658

Representatives:

e3chbD1[D:1-103] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN ; ligands: UNX ; X-RAY DIFFRACTION 1.25Å

e2chbH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CHOLERA TOXIN ; X-RAY DIFFRACTION 2.0Å

e1s5eE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; X-RAY DIFFRACTION 1.9Å

e1pzjH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera Toxin B Subunit ; ligands: 15B ; X-RAY DIFFRACTION 1.46Å

e1s5fE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; ligands: GAL ; X-RAY DIFFRACTION 2.6Å

e2o2lE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; X-RAY DIFFRACTION 2.5Å

e1s5cG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

cholera enterotoxin B-subunit ; X-RAY DIFFRACTION 2.50Å

e1b44D1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

PROTEIN (B-POL SUBUNIT OF HEAT-LABILE ENTEROTOXIN) ; X-RAY DIFFRACTION 3.3Å

e1ltaF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN, SUBUNIT B ; ligands: GAL ; X-RAY DIFFRACTION 2.2Å

e1s5fF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; ligands: GAL ; X-RAY DIFFRACTION 2.6Å

e1lt6D1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN ; ligands: GAA ; X-RAY DIFFRACTION 2.2Å

e1b44E1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

PROTEIN (B-POL SUBUNIT OF HEAT-LABILE ENTEROTOXIN) ; X-RAY DIFFRACTION 3.3Å

e1rd9D1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; ligands: BV2,P6G,TRS ; X-RAY DIFFRACTION 1.44Å

e1eeiF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (CHOLERA TOXIN B) ; ligands: GAA ; X-RAY DIFFRACTION 2.0Å

e1ltgE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN ; X-RAY DIFFRACTION 2.4Å

e1jr0E1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B SUBUNIT ; ligands: A24 ; X-RAY DIFFRACTION 1.3Å

e1md2E1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B SUBUNIT ; ligands: 233 ; X-RAY DIFFRACTION 1.4Å

e1ltrF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

HEAT-LABILE ENTEROTOXIN ; ligands: SO4 ; X-RAY DIFFRACTION 3.04Å

e3efxG1[G:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B, Heat-labile enterotoxin B chain ; X-RAY DIFFRACTION 1.940Å

e1pziD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile Enterotoxin B subunit ; ligands: 1DM ; X-RAY DIFFRACTION 1.99Å

e1s5eF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; X-RAY DIFFRACTION 1.9Å

e1chpE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PENTAMER ; X-RAY DIFFRACTION

e1djrF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN ; ligands: BEZ,GLA ; X-RAY DIFFRACTION 1.3Å

e2chbE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CHOLERA TOXIN ; X-RAY DIFFRACTION 2.0Å

e1ct1H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CHOLERA TOXIN ; ligands: CL ; X-RAY DIFFRACTION 2.3Å

e1lt3D1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

HEAT-LABILE ENTEROTOXIN ; X-RAY DIFFRACTION 2.0Å

e1ltaG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN, SUBUNIT B ; ligands: GAL ; X-RAY DIFFRACTION 2.2Å

e1jqyO1[O:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: A32 ; X-RAY DIFFRACTION 2.14Å

e1fgbH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B SUBUNIT PENTAMER ; X-RAY DIFFRACTION 2.4Å

e1md2H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B SUBUNIT ; X-RAY DIFFRACTION 1.4Å

e2chbG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CHOLERA TOXIN ; X-RAY DIFFRACTION 2.0Å

e1ltgH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN ; X-RAY DIFFRACTION 2.4Å

e1b44H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

PROTEIN (B-POL SUBUNIT OF HEAT-LABILE ENTEROTOXIN) ; X-RAY DIFFRACTION 3.3Å

e1xtcH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN ; X-RAY DIFFRACTION 2.4Å

e1chpG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PENTAMER ; X-RAY DIFFRACTION

e1rdpD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; ligands: BV3,PGE,TRS ; X-RAY DIFFRACTION 1.35Å

e1jqyE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: A32 ; X-RAY DIFFRACTION 2.14Å

e1ct1E1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CHOLERA TOXIN ; X-RAY DIFFRACTION 2.3Å

e1jqyM1[M:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: A32 ; X-RAY DIFFRACTION 2.14Å

e1lttF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN, SUBUNIT B ; X-RAY DIFFRACTION 2.3Å

e1llrD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B SUBUNIT ; ligands: FNG ; X-RAY DIFFRACTION 1.46Å

e2o2lD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; X-RAY DIFFRACTION 2.5Å

e1jqyH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: A32 ; X-RAY DIFFRACTION 2.14Å

e1s5eM1[M:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; X-RAY DIFFRACTION 1.9Å

e1rf2H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; ligands: BV4,PGE,TRS ; X-RAY DIFFRACTION 1.35Å

e1pzkH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera Toxin B Subunit ; ligands: J12 ; X-RAY DIFFRACTION 1.35Å

e1g8zF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN ; ligands: GAL ; X-RAY DIFFRACTION 2.0Å

e1pzjE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera Toxin B Subunit ; ligands: 15B,J15 ; X-RAY DIFFRACTION 1.46Å

e1lt4H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

HEAT-LABILE ENTEROTOXIN ; X-RAY DIFFRACTION 2.0Å

e1pziE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile Enterotoxin B subunit ; ligands: 1DM ; X-RAY DIFFRACTION 1.99Å

e1pzjF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera Toxin B Subunit ; ligands: J15 ; X-RAY DIFFRACTION 1.46Å

e1ct1F1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CHOLERA TOXIN ; X-RAY DIFFRACTION 2.3Å

e1s5dH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

cholera toxin B protein (CTB) ; ligands: GAL ; X-RAY DIFFRACTION 1.75Å

e1rd9H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHOLERA TOXIN B PROTEIN (CTB) ; ligands: BV2,P6G,TRS ; X-RAY DIFFRACTION 1.44Å

e2o2lJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; X-RAY DIFFRACTION 2.5Å

e1pzjG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera Toxin B Subunit ; ligands: 15B,J15 ; X-RAY DIFFRACTION 1.46Å

e1fd7E1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: AI1 ; X-RAY DIFFRACTION 1.8Å

e1ltbH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN, SUBUNIT B ; X-RAY DIFFRACTION 2.6Å

e1fd7P1[P:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: AI1 ; X-RAY DIFFRACTION 1.8Å

e1lttG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN, SUBUNIT B ; X-RAY DIFFRACTION 2.3Å

e2wv6D1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.89Å

e2xrqD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; X-RAY DIFFRACTION 2.40Å

e2wv6F1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6E1[E:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6G1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6H1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: EDO ; X-RAY DIFFRACTION 1.89Å

e2wv6I1[I:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6J1[J:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6K1[K:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6L1[L:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: EDO,GOL ; X-RAY DIFFRACTION 1.89Å

e2wv6M1[M:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CFXB ; ligands: GOL ; X-RAY DIFFRACTION 1.89Å

e2xrqE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; X-RAY DIFFRACTION 2.40Å

e2xrqF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; X-RAY DIFFRACTION 2.40Å

e2xrqG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; X-RAY DIFFRACTION 2.40Å

e2xrqH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; X-RAY DIFFRACTION 2.40Å

e2xrsD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsL1[L:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsM1[M:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsN1[N:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsO1[O:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e2xrsP1[P:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN B CHAIN ; ligands: GAL ; X-RAY DIFFRACTION 1.80Å

e4l6tB1[B:22-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; X-RAY DIFFRACTION 1.86Å

e4l6tC1[C:22-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; X-RAY DIFFRACTION 1.86Å

e4l6tD1[D:22-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; X-RAY DIFFRACTION 1.86Å

e4l6tE1[E:22-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; X-RAY DIFFRACTION 1.86Å

e4l6tF1[F:22-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; X-RAY DIFFRACTION 1.86Å

e4l63B1[B:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; ligands: EPE ; X-RAY DIFFRACTION 1.8Å

e4l63C1[C:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; ligands: EPE ; X-RAY DIFFRACTION 1.8Å

e4l63D1[D:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; ligands: EPE ; X-RAY DIFFRACTION 1.8Å

e4l63E1[E:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; ligands: EPE ; X-RAY DIFFRACTION 1.8Å

e4l63F1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECXB ; ligands: EPE ; X-RAY DIFFRACTION 1.8Å

e5elbA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG,PEG ; X-RAY DIFFRACTION 1.08Å

e5elbH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NAG,NDG ; X-RAY DIFFRACTION 1.08Å

e5elbJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: BCN,CA,FUC,GAL,GLA,NAG,NDG ; X-RAY DIFFRACTION 1.08Å

e5elcA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.5Å

e5elcB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.5Å

e5elcC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.5Å

e5elcD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL ; X-RAY DIFFRACTION 1.5Å

e5elcE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.5Å

e5elcF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.5Å

e5elcG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NAG ; X-RAY DIFFRACTION 1.5Å

e5elcH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.5Å

e5elcI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.5Å

e5elcJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.5Å

e5eldA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: A2G,FUC,GAL,MES,NDG,PEG ; X-RAY DIFFRACTION 1.4Å

e5eldB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: FUC,MES,NA,NDG ; X-RAY DIFFRACTION 1.4Å

e5eldC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: A2G,FUC,GAL,MES,NDG,PGE ; X-RAY DIFFRACTION 1.4Å

e5eldD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: A2G,FUC,GAL,NDG,PEG,PGE ; X-RAY DIFFRACTION 1.4Å

e5eldE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: A2G,FUC,GAL,GLA,NDG,PEG,PGE ; X-RAY DIFFRACTION 1.4Å

e5eleA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.6Å

e5eleB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA ; X-RAY DIFFRACTION 1.6Å

e5eleC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.6Å

e5eleD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.6Å

e5eleE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.6Å

e5eleF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 1PE,BCN,CA,FUC ; X-RAY DIFFRACTION 1.6Å

e5eleG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.6Å

e5eleH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.6Å

e5eleI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.6Å

e5eleJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 1PE,A2G,BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.6Å

e5elfA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,CA,FUC,GAL,GLC ; X-RAY DIFFRACTION 1.55Å

e5elfB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.55Å

e5elfC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.55Å

e5elfD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,BGC,CA,FUC,GAL,GLC ; X-RAY DIFFRACTION 1.55Å

e5elfE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,CA,FUC,GAL,GLC ; X-RAY DIFFRACTION 1.55Å

e5elfF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,BGC,CA,FUC,GAL,PG4 ; X-RAY DIFFRACTION 1.55Å

e5elfG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,BGC,CA,FUC,GAL,GLC ; X-RAY DIFFRACTION 1.55Å

e5elfH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.55Å

e5elfI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,CA,FUC,GAL,GLC ; X-RAY DIFFRACTION 1.55Å

e5elfJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: A2G,BCN,CA,FUC,GAL,GLC,PG4 ; X-RAY DIFFRACTION 1.55Å

e5lziA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: 7BQ,7DB,GOL ; X-RAY DIFFRACTION 1.60Å

e5lziB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: 7BQ,7DB,GOL ; X-RAY DIFFRACTION 1.60Å

e5lziC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: 7DB,GOL,PO4 ; X-RAY DIFFRACTION 1.60Å

e5lziD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: 7DB,GOL ; X-RAY DIFFRACTION 1.60Å

e5lziE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: 7DB,GOL ; X-RAY DIFFRACTION 1.60Å

e5lzhA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: 7BO ; X-RAY DIFFRACTION 1.13Å

e5lzhB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: 7BO,MRD ; X-RAY DIFFRACTION 1.13Å

e5lzhD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: 7BO,TRS ; X-RAY DIFFRACTION 1.13Å

e5lzhC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: 7BO,CA ; X-RAY DIFFRACTION 1.13Å

e5lzhE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B subunit ; ligands: 7BO,CA,PEG,TRS ; X-RAY DIFFRACTION 1.13Å

e5lzgA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BN,IMD,TRS ; X-RAY DIFFRACTION 1.12Å

e5lzgB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BN ; X-RAY DIFFRACTION 1.12Å

e5lzgC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BN,PEG ; X-RAY DIFFRACTION 1.12Å

e5lzgD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BN,IMD,MRD ; X-RAY DIFFRACTION 1.12Å

e5lzgE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BN,MRD,TRS ; X-RAY DIFFRACTION 1.12Å

e5lzjA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: SO4 ; X-RAY DIFFRACTION 1.20Å

e5lzjB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: PEG,PGE ; X-RAY DIFFRACTION 1.20Å

e5lzjC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BT,PEG,PGE ; X-RAY DIFFRACTION 1.20Å

e5lzjD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: 7BT,PEG,PGE ; X-RAY DIFFRACTION 1.20Å

e5lzjE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin subunit B ; ligands: PEG ; X-RAY DIFFRACTION 1.20Å

e6ialD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: GOL,NA ; X-RAY DIFFRACTION 1.45Å

e6ialE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: NA ; X-RAY DIFFRACTION 1.45Å

e6ialF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: NA ; X-RAY DIFFRACTION 1.45Å

e6ialG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: NA ; X-RAY DIFFRACTION 1.45Å

e6ialH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: GAL,GOL,NA,NAG ; X-RAY DIFFRACTION 1.45Å

e6ialA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: NA ; X-RAY DIFFRACTION 1.45Å

e6ialB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: CA,GOL,NA ; X-RAY DIFFRACTION 1.45Å

e6ialC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: CA,GOL,NA ; X-RAY DIFFRACTION 1.45Å

e6ialI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: NA ; X-RAY DIFFRACTION 1.45Å

e6ialJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin B chain ; ligands: GAL,NA,NAG ; X-RAY DIFFRACTION 1.45Å

e6hsvE1[E:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvA1[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD,PO4 ; X-RAY DIFFRACTION 2.45Å

e6hsvB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD,PO4 ; X-RAY DIFFRACTION 2.45Å

e6hsvF1[F:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD,PO4 ; X-RAY DIFFRACTION 2.45Å

e6hsvG1[G:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvH1[H:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD,PO4 ; X-RAY DIFFRACTION 2.45Å

e6hsvJ1[J:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvK1[K:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvL1[L:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvM1[M:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvN1[N:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvO1[O:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvP1[P:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD,PO4 ; X-RAY DIFFRACTION 2.45Å

e6hsvQ1[Q:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD,PO4 ; X-RAY DIFFRACTION 2.45Å

e6hsvR1[R:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvS1[S:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: MPD ; X-RAY DIFFRACTION 2.45Å

e6hsvT1[T:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Toxin B subunit ; ligands: CL,MPD ; X-RAY DIFFRACTION 2.45Å

e6hjdA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NAG ; X-RAY DIFFRACTION 1.54Å

e6hjdD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdE1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NAG,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdF1[F:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdG1[G:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdH1[H:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdI1[I:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC,GAL,NDG ; X-RAY DIFFRACTION 1.54Å

e6hjdJ1[J:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera toxin B subunit ; ligands: BCN,CA,FUC ; X-RAY DIFFRACTION 1.54Å

e6hmwA1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cholera enterotoxin B-subunit ; ligands: BCN,CA,FUL ; X-RAY DIFFRACTION 1.95Å

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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.

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

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