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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: LT-IIB

PF06453 CL0658

Representatives:

e1qb5D1[D:1-99] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B- PENTAMER) ; X-RAY DIFFRACTION 1.9Å

e8gufA1[A:-1-100] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.99Å

e8gufE1[E:-1-100] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.99Å

e8gufC1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.99Å

e8gufD1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.99Å

e8gw2A1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 2.71Å

e8gw2B1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 2.71Å

e8gw2C1[C:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 2.71Å

e8gw2E1[E:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 2.71Å

e1qb5E1[E:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B- PENTAMER) ; X-RAY DIFFRACTION 1.9Å

e1tiiE1[E:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT LABILE ENTEROTOXIN TYPE IIB ; X-RAY DIFFRACTION 2.25Å

e1qcbD1[D:1-99] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B-PENTAMER) ; X-RAY DIFFRACTION 2.20Å

e1tiiG1[G:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT LABILE ENTEROTOXIN TYPE IIB ; X-RAY DIFFRACTION 2.25Å

e1qb5F1[F:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B- PENTAMER) ; X-RAY DIFFRACTION 1.9Å

e1qb5G1[G:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B- PENTAMER) ; X-RAY DIFFRACTION 1.9Å

e1tiiD1[D:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT LABILE ENTEROTOXIN TYPE IIB ; X-RAY DIFFRACTION 2.25Å

e1tiiH1[H:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT LABILE ENTEROTOXIN TYPE IIB ; X-RAY DIFFRACTION 2.25Å

e1qcbE1[E:1-99] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B-PENTAMER) ; X-RAY DIFFRACTION 2.20Å

e1qcbF1[F:1-99] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B-PENTAMER) ; X-RAY DIFFRACTION 2.20Å

e1qb5H1[H:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B- PENTAMER) ; X-RAY DIFFRACTION 1.9Å

e1qcbG1[G:1-99] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B-PENTAMER) ; X-RAY DIFFRACTION 2.20Å

e1tiiF1[F:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT LABILE ENTEROTOXIN TYPE IIB ; X-RAY DIFFRACTION 2.25Å

e1qcbH1[H:1-99] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

PROTEIN (HEAT LABILE ENTEROTOXIN TYPE IIB B-PENTAMER) ; X-RAY DIFFRACTION 2.20Å

e4fnfD1[D:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.75Å

e4fo2H1[H:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fp5G1[G:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIB, B chain ; ligands: SO4 ; X-RAY DIFFRACTION 1.40Å

e4fnfG1[G:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fo2O1[O:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fo2M1[M:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT,NA ; X-RAY DIFFRACTION 1.5Å

e4fnfB1[B:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fo2Q1[Q:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT,NA ; X-RAY DIFFRACTION 1.5Å

e4fo2K1[K:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fnfE1[E:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fo2S1[S:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fp5H1[H:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIB, B chain ; X-RAY DIFFRACTION 1.40Å

e4fo2A1[A:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fo2G1[G:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fo2I1[I:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fo2C1[C:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e4fnfA1[A:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fo2E1[E:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e4fnfJ1[J:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fnfH1[H:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fp5D1[D:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIB, B chain ; X-RAY DIFFRACTION 1.40Å

e4fo2T1[T:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fo2R1[R:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e4fnfF1[F:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fnfC1[C:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fp5F1[F:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIB, B chain ; ligands: SO4 ; X-RAY DIFFRACTION 1.40Å

e4fo2B1[B:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e4fo2D1[D:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fnfI1[I:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.75Å

e4fo2P1[P:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.5Å

e4fo2F1[F:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e4fo2J1[J:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; X-RAY DIFFRACTION 1.5Å

e4fo2N1[N:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: ACT ; X-RAY DIFFRACTION 1.5Å

e4fp5E1[E:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIB, B chain ; X-RAY DIFFRACTION 1.40Å

e4fo2L1[L:1-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e5g3lD1[D:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA,SIA ; X-RAY DIFFRACTION 1.72Å

e5g3lE1[E:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA,SIA ; X-RAY DIFFRACTION 1.72Å

e5g3lH1[H:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA,SIA ; X-RAY DIFFRACTION 1.72Å

e5g3lF1[F:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: SIA ; X-RAY DIFFRACTION 1.72Å

e5g3lG1[G:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEAT-LABILE ENTEROTOXIN IIB, B CHAIN ; ligands: NA,SIA ; X-RAY DIFFRACTION 1.72Å

e7prpDDD1[DDD:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: NA ; X-RAY DIFFRACTION 2.3Å

e7prpEEE1[EEE:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: FMT,NA ; X-RAY DIFFRACTION 2.3Å

e7prpFFF1[FFF:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: NA ; X-RAY DIFFRACTION 2.3Å

e7prpGGG1[GGG:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: NA ; X-RAY DIFFRACTION 2.3Å

e7prpHHH1[HHH:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: NA ; X-RAY DIFFRACTION 2.3Å

e7prsDDD1[DDD:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e7prsEEE1[EEE:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e7prsFFF1[FFF:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SO4 ; X-RAY DIFFRACTION 2Å

e7prsGGG1[GGG:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e7prsHHH1[HHH:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e7prsIII1[III:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e7prsJJJ1[JJJ:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e7prsKKK1[KKK:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA ; X-RAY DIFFRACTION 2Å

e7prsLLL1[LLL:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA ; X-RAY DIFFRACTION 2Å

e7prsMMM1[MMM:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heat-labile enterotoxin IIA, B chain ; ligands: SIA,SO4 ; X-RAY DIFFRACTION 2Å

e8gufB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.99Å

e8gw2D1[D:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 2.71Å

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