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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: Restriction endonuclease-like
H: Restriction endonuclease-like
T: Restriction endonuclease-like
F: ERCC4

PF02732 CL0236

Representatives:

e1j23A1[A:5-135] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent RNA helicase, putative ; X-RAY DIFFRACTION 1.78Å

e2zixB3[B:247-367,B:404-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CROSSOVER JUNCTION ENDONUCLEASE EME1 ; X-RAY DIFFRACTION 3.5Å

e7f6lB1[B:63-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable crossover junction endonuclease EME2 ; X-RAY DIFFRACTION 3.199Å

e4p0pB2[B:239-370,B:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 2.75Å

e1j24A1[A:5-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent RNA helicase, putative ; ligands: CA ; X-RAY DIFFRACTION 1.78Å

e4p0qB2[B:233-370,B:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 2.85Å

e1j25A1[A:5-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent RNA helicase, putative ; ligands: MN ; X-RAY DIFFRACTION 1.78Å

e1j22A1[A:5-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP-dependent RNA helicase, putative ; X-RAY DIFFRACTION 1.8Å

e4p0rB2[B:233-370,B:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 6.46Å

e4p0rD2[D:233-370,D:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 6.46Å

e2bhnB2[B:19-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XPF ENDONUCLEASE ; X-RAY DIFFRACTION 3.200Å

e4p0sB2[B:233-370,B:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 5.92Å

e2bgwB2[B:18-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XPF ENDONUCLEASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.800Å

e2bhnA2[A:19-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XPF ENDONUCLEASE ; X-RAY DIFFRACTION 3.200Å

e4p0sD2[D:233-370,D:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 5.92Å

e2bhnD2[D:19-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XPF ENDONUCLEASE ; X-RAY DIFFRACTION 3.200Å

e4p0sF2[F:233-370,F:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 5.92Å

e4m6wA1[A:1815-1960] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fanconi anemia group M protein ; ligands: SO4 ; X-RAY DIFFRACTION 2.90Å

e4p0sH2[H:233-370,H:403-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 5.92Å

e2ziuB2[B:247-367,B:404-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 2.7Å

e2zivA3[A:311-366,A:388-526] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mus81 protein ; X-RAY DIFFRACTION 2.6Å

e4bxoA3[A:1818-1972] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FANCONI ANEMIA GROUP M PROTEIN ; ligands: CA ; X-RAY DIFFRACTION 2.15Å

e2ziwB2[B:250-319,B:349-368,B:404-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CROSSOVER JUNCTION ENDONUCLEASE EME1 ; X-RAY DIFFRACTION 2.8Å

e2zivB4[B:247-367,B:404-447] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease EME1 ; X-RAY DIFFRACTION 2.6Å

e2ziuA7[A:311-366,A:388-536] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mus81 protein ; X-RAY DIFFRACTION 2.7Å

e2zixA1[A:259-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CROSSOVER JUNCTION ENDONUCLEASE MUS81 ; X-RAY DIFFRACTION 3.5Å

e2bhnC3[C:20-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XPF ENDONUCLEASE ; X-RAY DIFFRACTION 3.200Å

e4p0pA2[A:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; ligands: MG ; X-RAY DIFFRACTION 2.75Å

e4p0qA2[A:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 2.85Å

e4p0rA2[A:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 6.46Å

e4p0rC2[C:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 6.46Å

e4p0sA2[A:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 5.92Å

e4p0sC2[C:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 5.92Å

e4p0sE2[E:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 5.92Å

e4p0sG2[G:256-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 5.92Å

e2ziwA2[A:312-505] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MUS81 PROTEIN ; X-RAY DIFFRACTION 2.8Å

e7f6lA2[A:259-452] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crossover junction endonuclease MUS81 ; X-RAY DIFFRACTION 3.199Å

e2bgwA2[A:16-148] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

XPF ENDONUCLEASE ; ligands: MG,SO4 ; X-RAY DIFFRACTION 2.800Å

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