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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

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

X: P-loop domains-like
H: P-loop domains-related
T: P-loop containing nucleoside triphosphate hydrolases
F: AAA_11

PF13086 CL0023

Representatives:

e5mznA1[A:1096-1176,A:1288-1470,A:1543-1652] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Helicase SEN1,Helicase SEN1 ; ligands: ADP,EDO,GOL,MG,PEG ; X-RAY DIFFRACTION 1.787Å

e6i59A2[A:1096-1176,A:1288-1652] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Helicase SEN1 ; ligands: ADP,EDO,GOL,MG,PEG ; X-RAY DIFFRACTION 2.95Å

e4pj3A3[A:416-492,A:660-706,A:795-1134] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Intron-binding protein aquarius ; ligands: ANP,MG ; X-RAY DIFFRACTION 2.300Å

e2wjvA3[A:286-322,A:415-699] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REGULATOR OF NONSENSE TRANSCRIPTS 1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.85Å

e5wwpB4[B:231-438] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF1ab ; ligands: SO4 ; X-RAY DIFFRACTION 3.0Å

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.

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