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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

X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4
H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4
T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4
F: NIR_SIR

PF01077

Representatives:

e1aopA3[A:149-183,A:210-345] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

SULFITE REDUCTASE HEMOPROTEIN ; ligands: PO4,SRM ; X-RAY DIFFRACTION 1.6Å

e3mmcA3[A:167-238,A:305-417] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SULFITE REDUCTASE, DISSIMILATORY-TYPE SUBUNIT ALPHA ; ligands: GOL,SF4,SRM ; X-RAY DIFFRACTION 2.04Å

e3mmcB3[B:123-196,B:262-366] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SULFITE REDUCTASE, DISSIMILATORY-TYPE SUBUNIT BETA ; ligands: SF4,SRM ; X-RAY DIFFRACTION 2.04Å

e1zj8A3[A:407-555] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable ferredoxin-dependent nitrite reductase NirA ; ligands: SF4,SRM ; X-RAY DIFFRACTION 2.8Å

e1zj8A4[A:162-326] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Probable ferredoxin-dependent nitrite reductase NirA ; ligands: CL,SRM ; X-RAY DIFFRACTION 2.8Å

e2akjA3[A:431-556] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ferredoxin--nitrite reductase, chloroplast ; ligands: SF4,SRM ; X-RAY DIFFRACTION 2.80Å

e2akjA4[A:175-345] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ferredoxin--nitrite reductase, chloroplast ; ligands: SRM ; X-RAY DIFFRACTION 2.80Å

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.

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