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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

X: Anti-LPS factor/recA domain
H: Anti-LPS factor/recA domain
T: Anti-LPS factor/recA domain
F: RecA_C

PF21096

Representatives:

e1u94A1[A:269-328] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RECA PROTEIN ; ligands: CA ; X-RAY DIFFRACTION 1.9Å

e1xp8A1[A:283-341] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RecA protein ; X-RAY DIFFRACTION 2.50Å

e3cmuA10[A:4270-4333] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein recA ; X-RAY DIFFRACTION 4.200Å

e3cmuA12[A:5270-5328] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein recA ; X-RAY DIFFRACTION 4.200Å

e3cmuA2[A:270-328] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein recA ; X-RAY DIFFRACTION 4.200Å

e3cmuA4[A:1270-1333] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein recA ; X-RAY DIFFRACTION 4.200Å

e3cmuA6[A:2270-2333] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein recA ; X-RAY DIFFRACTION 4.200Å

e3cmuA8[A:3270-3333] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein recA ; X-RAY DIFFRACTION 4.200Å

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

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