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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: Nucleic acid-binding proteins
T: Nucleic acid-binding proteins

54123, 3-crossover-4

F: TIP49

PF06068 CL0023

Representatives:

e4ww4B2[B:131-239] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; X-RAY DIFFRACTION 2.940Å

e4wvyA2[A:126-236] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; X-RAY DIFFRACTION 3.640Å

e2cqaA1[A:8-89] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

RuvB-like 2 ; SOLUTION NMR

e8oo7A3[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oo7B1[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oocA3[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oocB3[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oopA1[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oopB2[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oopC1[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oorA2[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oorB1[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oorC1[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oo7D1[D:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oocD1[D:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oopD3[D:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oorD2[D:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oo7F3[F:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oocF2[F:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oopE3[E:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oopF2[F:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oorE2[E:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oorF1[F:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etsW1[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etsY1[Y:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etuU3[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etuW2[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etuY2[Y:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etwU3[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etwW1[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etwY1[Y:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eu9W2[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eu9Y2[Y:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eufU3[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eufW3[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eufY2[Y:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etsV1[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etsX2[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etuT2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etuV3[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etuX2[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etwT2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etwV2[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etwX1[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eu9V1[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eu9X1[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eufT2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eufV3[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eufX3[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e2c9oB3[B:125-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RUVB-LIKE 1 ; X-RAY DIFFRACTION 2.200Å

e6fhsC2[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e6etxB2[B:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH

e6fhsA3[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e6fhsB3[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e6fmlA2[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e6fmlB2[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e6fmlC2[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e6etxD3[D:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH

e6etxF2[F:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH

e6etxA3[A:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH

e6etxC3[C:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH

e6etxE3[E:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH

e5oafA2[A:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e5oafC1[C:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e5oafE2[E:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e5oafB3[B:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e5oafD1[D:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e5ounA1[A:128-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 2 ; SOLUTION NMR

e5n7rA3[A:131-201,A:227-240] Image Pymol Jmol Links: PDB, SCOP, CATH

e6h7xA2[A:131-202,A:228-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; X-RAY DIFFRACTION 2.892Å

e6gejT2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 1 ; ELECTRON MICROSCOPY

e6htsB1[B:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e6gejU1[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 2 ; ELECTRON MICROSCOPY

e6gejW2[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 2 ; ELECTRON MICROSCOPY

e6genU2[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 2 ; ELECTRON MICROSCOPY

e6genW3[W:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 2 ; ELECTRON MICROSCOPY

e6genY3[Y:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 2 ; ELECTRON MICROSCOPY

e6gejV2[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 1 ; ELECTRON MICROSCOPY

e6gejX1[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 1 ; ELECTRON MICROSCOPY

e6genT2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 1 ; ELECTRON MICROSCOPY

e6genV1[V:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 1 ; ELECTRON MICROSCOPY

e6genX2[X:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like protein 1 ; ELECTRON MICROSCOPY

e6htsD1[D:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e6htsF1[F:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e6igmA3[A:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e6igmE3[E:125-194,E:219-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e6igmB1[B:131-202,B:226-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e6igmD3[D:131-210,D:232-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e6igmC3[C:125-136,C:157-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e6igmF2[F:131-197,F:232-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e7oleA3[A:223-333] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e7oleC3[C:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e7oleE2[E:125-235] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 1 ; ELECTRON MICROSCOPY

e7oleB1[B:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e7oleD2[D:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e7oleF2[F:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like 2 ; ELECTRON MICROSCOPY

e8av6D2[D:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e8av6E1[E:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e8av6F2[F:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e8av6A1[A:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e8av6B2[B:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e8av6C1[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RuvB-like helicase ; ELECTRON MICROSCOPY

e7zi4B2[B:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH

RuvB-like 2 ; ELECTRON MICROSCOPY

e7zi4D1[D:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH

RuvB-like 2 ; ELECTRON MICROSCOPY

e7zi4F1[F:131-240] Image Pymol Jmol Links: PDB, SCOP, CATH

RuvB-like 2 ; ELECTRON MICROSCOPY

e8oo7C2[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oocC1[C:126-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oo7E3[E:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8oocE3[E:131-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eu9U1[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etsU2[U:129-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eu9T2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8etsT2[T:134-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

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