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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: Periplasmic binding protein-like II
H: Periplasmic binding protein-like II
T: Periplasmic binding protein-like II
F: PBP_like_2

PF12849 CL0177

Representatives:

e1ixhA2[A:1-76,A:255-321] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHOSPHATE-BINDING PROTEIN ; ligands: PO4 ; X-RAY DIFFRACTION 0.98Å

e1ixhA3[A:77-254] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHOSPHATE-BINDING PROTEIN ; ligands: PO4 ; X-RAY DIFFRACTION 0.98Å

e4jwoA1[A:55-137,A:283-338] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PHOSPHATE BINDING PROTEIN ; ligands: PEG,SO4 ; X-RAY DIFFRACTION 1.6Å

e4jwoA2[A:138-282] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PHOSPHATE BINDING PROTEIN ; ligands: EDO,FMT,PEG,SO4 ; X-RAY DIFFRACTION 1.6Å

e1twyA2[A:103-237] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

ABC transporter, periplasmic substrate-binding protein ; ligands: MG,PO4 ; X-RAY DIFFRACTION 1.65Å

e1twyA3[A:28-102,A:238-276] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

ABC transporter, periplasmic substrate-binding protein ; ligands: PO4 ; X-RAY DIFFRACTION 1.65Å

e2v3qA3[A:91-297] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HUMAN PHOSPHATE BINDING PROTEIN ; ligands: EDO,GOL,PO4 ; X-RAY DIFFRACTION 1.90Å

e3muqA1[A:27-105,A:219-259] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED CONSERVED PROTEIN ; X-RAY DIFFRACTION 2.05Å

e3muqA2[A:106-218] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED CONSERVED PROTEIN ; X-RAY DIFFRACTION 2.05Å

e1pc3A3[A:19-104,A:291-351] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHOSPHATE-BINDING PROTEIN 1 ; ligands: PO4 ; X-RAY DIFFRACTION 2.16Å

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