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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: Alkaline phosphatase-like
H: Alkaline phosphatase-like
T: Alkaline phosphatase-like
F: Metalloenzyme

PF01676 CL0088

Representatives:

e1o98A1[A:2-76,A:311-510] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2,3-BISPHOSPHOGLYCERATE-INDEPENDENT PHOSPHOGLYCERATE MUTASE ; ligands: 2PG,MN,SO4 ; X-RAY DIFFRACTION 1.4Å

e3m7vA1[A:3-107,A:227-403] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Phosphopentomutase ; ligands: GOL,MN ; X-RAY DIFFRACTION 2.0Å

e3iddA1[A:3-88,A:230-397] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

2,3-BISPHOSPHOGLYCERATE-INDEPENDENT PHOSPHOGLYCERATE MUTASE ; X-RAY DIFFRACTION 2.8Å

e3iddB3[B:2-88,B:230-397] Image Pymol Jmol Links: PDB, SCOP, CATH

2,3-BISPHOSPHOGLYCERATE-INDEPENDENT PHOSPHOGLYCERATE MUTASE ; X-RAY DIFFRACTION 2.8Å

e3kd8A2[A:1-87,A:229-396] Image Pymol Jmol Links: PDB, SCOP, CATH

2,3-BISPHOSPHOGLYCERATE-INDEPENDENT PHOSPHOGLYCERATE MUTASE ; X-RAY DIFFRACTION 2.6Å

e3kd8B1[B:1-87,B:229-396] Image Pymol Jmol Links: PDB, SCOP, CATH

2,3-BISPHOSPHOGLYCERATE-INDEPENDENT PHOSPHOGLYCERATE MUTASE ; X-RAY DIFFRACTION 2.6Å

e2zktA1[A:1-90,A:234-412] Image Pymol Jmol Links: PDB, SCOP, CATH

2,3-bisphosphoglycerate-independent phosphoglycerate mutase ; ligands: CA,ZN ; X-RAY DIFFRACTION 2.40Å

e2zktB2[B:2-90,B:234-412] Image Pymol Jmol Links: PDB, SCOP, CATH

2,3-bisphosphoglycerate-independent phosphoglycerate mutase ; ligands: CA,ZN ; X-RAY DIFFRACTION 2.40Å

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