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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

X: MinE-like

both are dimers, but slightly different dimerization mode

X: YefM-like
H: YefM-like
T: YefM-like
F: PhdYeFM_antitox

PF02604 CL0136

Representatives:

Domain assembly:

e2odkA1[A:1-51] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN , X-RAY DIFFRACTION 1.4Å

e2odkB1[B:2-51] Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN , X-RAY DIFFRACTION 1.4Å

Domain assembly:

e2odkB1[B:2-51] Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN , X-RAY DIFFRACTION 1.4Å

e2odkA1[A:1-51] Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN , X-RAY DIFFRACTION 1.4Å

e7v5yA1[A:1-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin ; X-RAY DIFFRACTION 2.25Å

e7v5yC1[C:1-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin ; X-RAY DIFFRACTION 2.25Å

e7v6wC1[C:1-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin ; X-RAY DIFFRACTION 2.55Å

e7v6wA1[A:1-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin ; X-RAY DIFFRACTION 2.55Å

e7v6wI1[I:1-56] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin ; X-RAY DIFFRACTION 2.55Å

e7v6wK1[K:1-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin ; X-RAY DIFFRACTION 2.55Å

e2odkC1[C:1-51] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.4Å

Domain assembly:

e2a6qA1[A:10-92] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin yefM , X-RAY DIFFRACTION 2.03Å

e2a6qB1[B:10-64] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin yefM , X-RAY DIFFRACTION 2.03Å

e2a6qD1[D:10-64] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin yefM ; X-RAY DIFFRACTION 2.03Å

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