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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

X: Four-helical up-and-down bundle
H: FAD-dependent thiol oxidase
T: FAD-dependent thiol oxidase
F: Evr1_Alr

PF04777

Representatives:

e1jr8A1[A:7-111] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ERV2 PROTEIN, MITOCHONDRIAL ; ligands: FAD ; X-RAY DIFFRACTION 1.5Å

e1oqcA1[A:13-124] nonrep Image Pymol Jmol Links: PDB, SCOP, CATHDOI

AUGMENTER OF LIVER REGENERATION ; ligands: FAD ; X-RAY DIFFRACTION 1.8Å

e3td7A1[A:32-174] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FAD-linked sulfhydryl oxidase R596 ; ligands: FAD ; X-RAY DIFFRACTION 2.21Å

e3qcpA3[A:304-446] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

QSOX FROM TRYPANOSOMA BRUCEI (TBQSOX) ; ligands: FAD ; X-RAY DIFFRACTION 2.3Å

e4p2lA4[A:395-547] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Sulfhydryl oxidase 1 ; ligands: FAD ; X-RAY DIFFRACTION 2.9Å

e4e0iA1[A:14-47,A:71-188] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MITOCHONDRIAL FAD-LINKED SULFHYDRYL OXIDASE ERV1 ; ligands: FAD ; X-RAY DIFFRACTION 3.0Å

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

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