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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

H: RIFT-related
T: acid protease

126354, 3-crossover-4

T: double psi

152436, 2-crossover-3, 5-crossover-6

T: AbrB

122'1'344'3', 2-crossover-3, 2'-crossover-3'

T: Bacterial fluorinating enzyme-C

1265437, 2-crossover-3, 6-crossover-7

T: FMN-binding split barrel

123654, 3-crossover-4

T: Surface presentation of antigens (SPOA)

123654, 3-crossover-4, swapping

T: Alanine racemase-C

125436, 2-crossover-3, 5-crossover-6

F: FAD_binding_6

PF00970 CL0105

Representatives:

e1krhA1[A:106-205] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Benzoate 1,2-Dioxygenase Reductase ; ligands: FAD,SO4 ; X-RAY DIFFRACTION 1.5Å

e1fdrA1[A:2-100] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FLAVODOXIN REDUCTASE ; ligands: FAD ; X-RAY DIFFRACTION 1.70Å

e1cqxA1[A:151-261] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FLAVOHEMOPROTEIN ; ligands: FAD ; X-RAY DIFFRACTION 1.75Å

e1umkA1[A:30-153] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-CYTOCHROME B5 REDUCTASE ; ligands: FAD ; X-RAY DIFFRACTION 1.75Å

e7tswA1[A:31-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 ; ligands: FAD ; X-RAY DIFFRACTION 2.4Å

e7tswB1[B:31-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 ; ligands: FAD ; X-RAY DIFFRACTION 2.4Å

e7tswC1[C:31-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 ; ligands: FAD ; X-RAY DIFFRACTION 2.4Å

e7tswD2[D:32-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 ; ligands: FAD ; X-RAY DIFFRACTION 2.4Å

e7tswE1[E:31-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 ; ligands: FAD ; X-RAY DIFFRACTION 2.4Å

e7tswF1[F:31-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 ; ligands: FAD ; X-RAY DIFFRACTION 2.4Å

e7w3oA1[A:4-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-cytochrome b5 reductase 3 soluble form ; ligands: FAD ; X-RAY DIFFRACTION 2.46Å

e7w3oB2[B:4-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-cytochrome b5 reductase 3 soluble form ; ligands: FAD ; X-RAY DIFFRACTION 2.46Å

e7w3oC1[C:4-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-cytochrome b5 reductase 3 soluble form ; ligands: FAD ; X-RAY DIFFRACTION 2.46Å

e7w3oD1[D:6-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-cytochrome b5 reductase 3 soluble form ; ligands: FAD ; X-RAY DIFFRACTION 2.46Å

e7w3oE1[E:5-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NADH-cytochrome b5 reductase 3 soluble form ; X-RAY DIFFRACTION 2.46Å

e7thgA2[A:31-153] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 soluble form ; ligands: FAD ; X-RAY DIFFRACTION 2.9Å

e7tnvA1[A:32-154] Image Pymol Jmol Links: PDB, SCOP, CATH

NADH-cytochrome b5 reductase 3 soluble form ; ligands: FAD ; X-RAY DIFFRACTION 1.93Å

e1a8pA1[A:2-100] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

NADPH\:FERREDOXIN OXIDOREDUCTASE ; ligands: FAD ; X-RAY DIFFRACTION 2.0Å

e1ep3B1[B:2-102] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DIHYDROOROTATE DEHYDROGENASE B (PYRK SUBUNIT) ; ligands: FAD ; X-RAY DIFFRACTION 2.1Å

e1qfjA1[A:1-97] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (FLAVIN REDUCTASE) ; ligands: GOL ; X-RAY DIFFRACTION 2.2Å

e4ylfA1[A:1-97] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Dihydroorotate dehydrogenase B (NAD(+)), electron transfer subunit homolog ; ligands: FAD ; X-RAY DIFFRACTION 2.3Å

e1tvcA1[A:2-110] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

METHANE MONOOXYGENASE COMPONENT C ; ligands: FDA ; SOLUTION NMR

e2piaA1[A:1-103] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

PHTHALATE DIOXYGENASE REDUCTASE ; ligands: FMN ; X-RAY DIFFRACTION

e4p6vF2[F:128-268] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: FAD

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.

T: Aminomethyltransferase beta-barrel domain

143256, 1-crossover-2, 4-crossover-5

T: PUA domain

12543, 2-crossover-3

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

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