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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

X: 4Fe-4S ferredoxin
H: 4Fe-4S ferredoxin
T: 4Fe-4S ferredoxin
F: Nqo3_Fer4

PF22117

Representatives:

e2fug33[3:162-246] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-quinone oxidoreductase chain 3 ; ligands: SF4 ; X-RAY DIFFRACTION 3.300Å

e5ldwG2[G:136-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-ubiquinone oxidoreductase 75 kDa subunit, mitochondrial,NADH-ubiquinone oxidoreductase 75 kDa subunit, mitochondrial ; ligands: SF4 ; ELECTRON MICROSCOPY

e4heaD12[D:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: SF4 ; X-RAY DIFFRACTION 3.3Å

e2ybb37[3:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,MG,SF4 ; ELECTRON MICROSCOPY

e3m9s37[3:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: SF4 ; X-RAY DIFFRACTION 4.5Å

e3i9vC7[C:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,MN,SF4 ; X-RAY DIFFRACTION 3.1Å

e3iam37[3:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,MG,SF4 ; X-RAY DIFFRACTION 3.1Å

e3iamC7[C:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,MG,SF4 ; X-RAY DIFFRACTION 3.1Å

e3m9sC7[C:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: SF4 ; X-RAY DIFFRACTION 4.5Å

e4hea37[3:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: SF4 ; X-RAY DIFFRACTION 3.3Å

e3ias37[3:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,SF4 ; X-RAY DIFFRACTION 3.15Å

e3iasC7[C:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,SF4 ; X-RAY DIFFRACTION 3.15Å

e3iasL7[L:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,SF4 ; X-RAY DIFFRACTION 3.15Å

e3iasU7[U:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-QUINONE OXIDOREDUCTASE SUBUNIT 3 ; ligands: CA,SF4 ; X-RAY DIFFRACTION 3.15Å

e2fugC7[C:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-quinone oxidoreductase chain 3 ; ligands: SF4 ; X-RAY DIFFRACTION 3.300Å

e2fugL2[L:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-quinone oxidoreductase chain 3 ; ligands: SF4 ; X-RAY DIFFRACTION 3.300Å

e2fugU6[U:162-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-quinone oxidoreductase chain 3 ; ligands: SF4 ; X-RAY DIFFRACTION 3.300Å

e5lnk33[3:137-217] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mitochondrial complex I, 75 kDa subunit ; ligands: SF4 ; ELECTRON MICROSCOPY

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.

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

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

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