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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

X: beta-Trefoil
H: beta-Trefoil
T: beta-Trefoil
F: Ricin_B_lectin

PF00652 CL0066

Representatives:

e1knmA1[A:2-130] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-XYLANASE A ; ligands: GOL,LAT ; X-RAY DIFFRACTION 1.2Å

e1v6vB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1v6xB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1isyB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: BGC ; X-RAY DIFFRACTION 2.1Å

e1v6wA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.0Å

e1iswB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1isyA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: BGC ; X-RAY DIFFRACTION 2.1Å

e1isxB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

endo-1,4-beta-D-xylanase ; ligands: XYP ; X-RAY DIFFRACTION 2.00Å

e1isvB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1v6uB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1v6xA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1iswA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1v6uA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP,XYS ; X-RAY DIFFRACTION 2.1Å

e1isvA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1knlA1[A:4-129] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-XYLANASE A ; ligands: GOL ; X-RAY DIFFRACTION 1.2Å

e1v6wB1[B:808-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.0Å

e1mc9A1[A:4-129] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-XYLANASE A ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.7Å

e1v6vA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: XYP ; X-RAY DIFFRACTION 2.1Å

e1isxA1[A:308-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

endo-1,4-beta-D-xylanase ; ligands: XYP ; X-RAY DIFFRACTION 2.00Å

e2d1zA1[A:302-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.6Å

e2d1zB1[B:802-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.6Å

e2d20A1[A:302-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.85Å

e2d20B1[B:802-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.85Å

e2d22A1[A:302-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.7Å

e2d22B1[B:802-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å

e2d23A1[A:302-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.95Å

e2d23B1[B:802-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.95Å

e2d24A1[A:302-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.85Å

e2d24B1[B:802-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GOL ; X-RAY DIFFRACTION 1.85Å

e3a21A5[A:527-658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE SECRETED ALPHA-GALACTOSIDASE ; ligands: 1PG,GOL ; X-RAY DIFFRACTION 1.51Å

e3a22A9[A:527-658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE SECRETED ALPHA-GALACTOSIDASE ; ligands: ARA,GOL ; X-RAY DIFFRACTION 1.9Å

e3a22B9[B:527-658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE SECRETED ALPHA-GALACTOSIDASE ; ligands: 1PG,ARA,GOL ; X-RAY DIFFRACTION 1.9Å

e3a23A9[A:527-658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE SECRETED ALPHA-GALACTOSIDASE ; ligands: GOL ; X-RAY DIFFRACTION 1.9Å

e3a21B9[B:527-658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE SECRETED ALPHA-GALACTOSIDASE ; ligands: 1PG,GOL ; X-RAY DIFFRACTION 1.51Å

e3a23B9[B:527-658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE SECRETED ALPHA-GALACTOSIDASE ; ligands: GAL,GOL ; X-RAY DIFFRACTION 1.9Å

e1xyfA1[A:313-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-XYLANASE ; X-RAY DIFFRACTION 1.9Å

e1xyfB1[B:813-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-XYLANASE ; X-RAY DIFFRACTION 1.9Å

e1it0A1[A:313-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: LAT ; X-RAY DIFFRACTION 2.0Å

e1it0B1[B:813-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: LAT ; X-RAY DIFFRACTION 2.0Å

e1iszA1[A:313-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GAL ; X-RAY DIFFRACTION 2.0Å

e1iszB1[B:813-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENDO-1,4-BETA-D-XYLANASE ; ligands: GAL ; X-RAY DIFFRACTION 2.0Å

e3a07A1[A:45-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Actinohivin ; ligands: NA ; X-RAY DIFFRACTION 1.190Å

e3a07B1[B:43-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Actinohivin ; ligands: NA ; X-RAY DIFFRACTION 1.190Å

e4denA1[A:49-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ACTINOHIVIN ; ligands: 2M4,K ; X-RAY DIFFRACTION 1.6Å

e4endA1[A:1-114] Image Pymol Jmol Links: PDB, SCOP, CATH

ACTINOHIVIN ; ligands: 2M4,CCN ; X-RAY DIFFRACTION 1.9Å

e4g1rA1[A:1-114] Image Pymol Jmol Links: PDB, SCOP, CATH

ACTINOHIVIN ; ligands: 2M4 ; X-RAY DIFFRACTION 1.57Å

e4g1rC1[C:1-114] Image Pymol Jmol Links: PDB, SCOP, CATH

ACTINOHIVIN ; ligands: 2M4 ; X-RAY DIFFRACTION 1.57Å

e4g1sA1[A:1-114] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: 2M4

e4p6aA1[A:1-114] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Actinohivin ; X-RAY DIFFRACTION 1.398Å

e5gqdA2[A:302-427] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-xylanase ; ligands: GOL ; X-RAY DIFFRACTION 1.80Å

e5gqdB1[B:802-927] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-xylanase ; ligands: GOL ; X-RAY DIFFRACTION 1.80Å

e5gqeA1[A:302-436] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-xylanase ; ligands: XYP ; X-RAY DIFFRACTION 2.50Å

e5gqeB1[B:802-936] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-xylanase ; ligands: XYP ; X-RAY DIFFRACTION 2.50Å

e1dqgA1[A:2-135] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MANNOSE RECEPTOR ; ligands: SO4 ; X-RAY DIFFRACTION 1.7Å

e1vclA1[A:1-150] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemolytic lectin CEL-III ; ligands: BTB,CA,MG ; X-RAY DIFFRACTION 1.7Å

e1m2tB1[B:249-384] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

mistletoe lectin I B chain ; ligands: GOL,NAG ; X-RAY DIFFRACTION 1.89Å

e1m2tB2[B:385-510] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

mistletoe lectin I B chain ; ligands: GOL,NAG ; X-RAY DIFFRACTION 1.89Å

e2zqnA1[A:131-260] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

29-KDA GALACTOSE-BINDING LECTIN ; ligands: IMD,PO4 ; X-RAY DIFFRACTION 1.9Å

e1xhbA1[A:423-553] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polypeptide N-acetylgalactosaminyltransferase 1 ; ligands: CA ; X-RAY DIFFRACTION 2.5Å

e1ggpB1[B:141-267] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN (LECTIN 1 B CHAIN) ; X-RAY DIFFRACTION 2.7Å

e1hwmB2[B:136-266] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EBULIN ; X-RAY DIFFRACTION 2.8Å

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 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