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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: Single-stranded right-handed beta-helix
H: Pectin lyase-like
T: Pectin lyase-like
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.

Representatives:

e3n6zA1[A:29-381] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

putative immunoglobulin A1 protease ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.30Å

e4tyvA1[A:293-605] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative secreted protein ; ligands: EDO ; X-RAY DIFFRACTION 1.660Å

e4tyvA2[A:58-292] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative secreted protein ; ligands: EDO ; X-RAY DIFFRACTION 1.660Å

e4tyvB1[B:55-605] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative secreted protein ; ligands: EDO,GLC ; X-RAY DIFFRACTION 1.660Å

e6eu4A1[A:16-466] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tail spike protein ; ligands: ZN ; X-RAY DIFFRACTION 1.79Å

e4oj6C2[C:172-768] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tailspike protein ; X-RAY DIFFRACTION 1.8Å

e6beaA1[A:40-472] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Autotransporter protein UpaB ; ligands: CA,CL,GOL,NA,P6G,SO4 ; X-RAY DIFFRACTION 1.970Å

e2vbeA1[A:113-549] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TAILSPIKE-PROTEIN ; ligands: CA,EDO,MN,PO4 ; X-RAY DIFFRACTION 1.98Å

e5gzt.1[A:214-282,B:283-459] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase ; ligands: FMT,NA ; X-RAY DIFFRACTION 2.10Å

e5w6fB2[B:207-261] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

tailspike protein 3 ; X-RAY DIFFRACTION 2.18Å

e5w6hA3[A:498-873] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

tailspike protein 4 ; ligands: ACT,SO4,ZN ; X-RAY DIFFRACTION 2.289Å

e5w6pF2[F:331-680] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

tailspike protein 2 ; ligands: EDO,K,ZN ; X-RAY DIFFRACTION 2.33Å

e5gqcD1[D:45-627] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Lacto-N-biosidase ; ligands: CA ; X-RAY DIFFRACTION 2.36Å

e5w5pA2[A:98-445] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tail fiber protein ; ligands: ZN ; X-RAY DIFFRACTION 2.429Å

e7v6iA1[A:45-641] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Lacto-N-biosidase ; X-RAY DIFFRACTION 2.51Å

e6e1rA2[A:271-624] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Tailspike protein ; X-RAY DIFFRACTION 2.69Å

e2kzwA2[A:1-44] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; SOLUTION NMR

e4rmxA1[A:201-670] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: CL,NA,SR

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