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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: Heme iron utilization protein-like
H: Heme iron utilization protein-like
T: Heme iron utilization protein-like
F: ChuX_HutX

PF06228 CL0312

Representatives:

e2hqvA2[A:61-186] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AGR_C_4470P ; X-RAY DIFFRACTION 2.0Å

e2ph0A3[A:38-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Uncharacterized protein ; X-RAY DIFFRACTION 1.85Å

e2oviB3[B:4-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein chuX ; X-RAY DIFFRACTION 2.050Å

e2oviD3[D:5-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein chuX ; X-RAY DIFFRACTION 2.050Å

e2oviC3[C:5-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein chuX ; X-RAY DIFFRACTION 2.050Å

e2ph0B2[B:38-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Uncharacterized protein ; X-RAY DIFFRACTION 1.85Å

e2oviA1[A:4-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein chuX ; X-RAY DIFFRACTION 2.050Å

e5exvD1[D:2-166] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemin-degrading HemS.ChuX domain protein ; X-RAY DIFFRACTION 2.9Å

e5exvB1[B:1-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemin-degrading HemS.ChuX domain protein ; X-RAY DIFFRACTION 2.9Å

e5exvC1[C:1-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemin-degrading HemS.ChuX domain protein ; X-RAY DIFFRACTION 2.9Å

e5exvE1[E:1-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemin-degrading HemS.ChuX domain protein ; X-RAY DIFFRACTION 2.9Å

e5exvF1[F:1-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemin-degrading HemS.ChuX domain protein ; X-RAY DIFFRACTION 2.9Å

e5exvA1[A:3-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemin-degrading HemS.ChuX domain protein ; X-RAY DIFFRACTION 2.9Å

e6u9jA1[A:4-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heme utilization carrier protein ; ligands: PO4 ; X-RAY DIFFRACTION 1.5Å

e6u9jB1[B:4-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heme utilization carrier protein ; ligands: IMD,NA ; X-RAY DIFFRACTION 1.5Å

e6u9jC1[C:4-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heme utilization carrier protein ; X-RAY DIFFRACTION 1.5Å

e6u9jD1[D:4-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Heme utilization carrier protein ; ligands: NA ; X-RAY DIFFRACTION 1.5Å

e3fm2A1[A:1-134] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein, distantly related to a heme binding/degrading HemS (PF05171) family ; ligands: ACT,ZN ; X-RAY DIFFRACTION 1.80Å

e3fm2B1[B:1-134] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein, distantly related to a heme binding/degrading HemS (PF05171) family ; ligands: ACT,ZN ; X-RAY DIFFRACTION 1.80Å

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