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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: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

X: Thioesterase/thiol ester dehydrase-isomerase-like
H: Thioesterase/thiol ester dehydrase-isomerase
T: Thioesterase/thiol ester dehydrase-isomerase
F: PS-DH

PF14765 CL0050

Representatives:

e3hrqA2[A:1454-1636] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aflatoxin biosynthesis polyketide synthase ; ligands: PLM ; X-RAY DIFFRACTION 1.800Å

e3kg6A2[A:1818-1967] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurF ; ligands: CA ; X-RAY DIFFRACTION 2.700Å

e3kg7A2[A:1061-1223] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurH ; X-RAY DIFFRACTION 2.770Å

e3kg7B2[B:1061-1223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurH ; X-RAY DIFFRACTION 2.770Å

e3kg7C2[C:1061-1223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurH ; X-RAY DIFFRACTION 2.770Å

e3kg7D2[D:1061-1223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurH ; X-RAY DIFFRACTION 2.770Å

e3kg8B2[B:1071-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurJ ; X-RAY DIFFRACTION 2.450Å

e4oocA1[A:1033-1219] Image Pymol Jmol Links: PDB, SCOP, CATH

Phthiocerol synthesis polyketide synthase type I PpsC ; ligands: PO4 ; X-RAY DIFFRACTION 2.620Å

e4u3vA1[A:108-257] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksR ; X-RAY DIFFRACTION 1.73Å

e5tz6A2[A:1076-1244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurJ ; ligands: 7OD ; X-RAY DIFFRACTION 2.4Å

e5tz6B2[B:1076-1244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CurJ ; X-RAY DIFFRACTION 2.4Å

e5hqwB1[B:2332-2495] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide synthase ; X-RAY DIFFRACTION 2.390Å

e5hqwA1[A:2332-2500] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide synthase ; X-RAY DIFFRACTION 2.390Å

e5hu7A2[A:2965-3137] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide synthase ; X-RAY DIFFRACTION 2.40Å

e5hu7B1[B:2965-3138] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide synthase ; X-RAY DIFFRACTION 2.40Å

e5hstA1[A:121-292] Image Pymol Jmol Links: PDB, SCOP, CATH

Polyketide synthase type I ; X-RAY DIFFRACTION 2.1Å

e5hstB1[B:121-289] Image Pymol Jmol Links: PDB, SCOP, CATH

Polyketide synthase type I ; X-RAY DIFFRACTION 2.1Å

e5il6A1[A:4486-4644] Image Pymol Jmol Links: PDB, SCOP, CATH

Polyketide synthase/nonribosomal peptide synthetase hybrid RzxB ; X-RAY DIFFRACTION 1.9Å

e5il6B2[B:4486-4646] Image Pymol Jmol Links: PDB, SCOP, CATH

Polyketide synthase/nonribosomal peptide synthetase hybrid RzxB ; X-RAY DIFFRACTION 1.9Å

e5j6oA1[A:2045-2222] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide synthase ; X-RAY DIFFRACTION 3.195Å

e5l84A1[A:1033-1218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phthiocerol synthesis polyketide synthase type I PpsC ; X-RAY DIFFRACTION 2.9Å

e4ln9B5[B:134-293] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIFAMYCIN POLYKETIDE SYNTHASE ; X-RAY DIFFRACTION 1.82Å

e4ln9A5[A:134-294] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIFAMYCIN POLYKETIDE SYNTHASE ; X-RAY DIFFRACTION 1.82Å

e6b2vA2[A:100-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SorB ; X-RAY DIFFRACTION 1.55Å

e5o15A2[A:138-306] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AmbC ; ligands: GOL ; X-RAY DIFFRACTION 1.174Å

e5o15B1[B:138-306] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AmbC ; X-RAY DIFFRACTION 1.174Å

e5o16A2[A:137-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AmbC ; ligands: SO4 ; X-RAY DIFFRACTION 2.745Å

e5o16B2[B:137-293] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AmbC ; X-RAY DIFFRACTION 2.745Å

e6mbhA1[A:1817-1985] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GphF Dehydratase 1 ; X-RAY DIFFRACTION 1.700Å

e6mbfA2[A:1817-1980] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GphF Dehydratase 1 ; ligands: MG ; X-RAY DIFFRACTION 1.540Å

e6mbgA1[A:1817-1979] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GphF ; ligands: BU1,MG ; X-RAY DIFFRACTION 1.850Å

e6obtA1[A:159-359] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Borrelidin polyketide synthase, type I ; X-RAY DIFFRACTION 1.800Å

e6obvA1[A:152-312] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

fluvirucin B1 DH domain from module 1 ; X-RAY DIFFRACTION 2.01Å

e6obvB1[B:152-300,B:307-311] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

fluvirucin B1 DH domain from module 1 ; X-RAY DIFFRACTION 2.01Å

e6obvC1[C:152-311] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

fluvirucin B1 DH domain from module 1 ; X-RAY DIFFRACTION 2.01Å

e6obvD1[D:152-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

fluvirucin B1 DH domain from module 1 ; X-RAY DIFFRACTION 2.01Å

e6k97A2[A:132-133,A:174-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fusion DH ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å

e6k97B1[B:132-133,B:178-319] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fusion DH ; X-RAY DIFFRACTION 2.5Å

e7zskB6[B:1260-1432] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskA6[A:1260-1431] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskD6[D:1260-1431] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskC6[C:1260-1432] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zmfA2[A:1261-1432] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; X-RAY DIFFRACTION 2.21Å

e7zmfB2[B:1261-1431] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; X-RAY DIFFRACTION 2.21Å

e7tzlA1[A:126-292] Image Pymol Jmol Links: PDB, SCOP, CATH

3-oxoacyl-[acyl-carrier-protein] reductase ; X-RAY DIFFRACTION 2.35Å

e7tzlB1[B:126-292] Image Pymol Jmol Links: PDB, SCOP, CATH

3-oxoacyl-[acyl-carrier-protein] reductase ; X-RAY DIFFRACTION 2.35Å

e5bp4A2[A:1022-1178] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mycocerosic acid synthase ; X-RAY DIFFRACTION 3.75Å

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 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