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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: KS-MAT linker domain in fatty acid synthase
H: KS-MAT linker domain in fatty acid synthase
T: KS-MAT linker domain in fatty acid synthase
F: RhiE-like_linker

PF22336

Representatives:

e4kc5A3[A:3497-3645] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RhiE protein ; X-RAY DIFFRACTION 2.14Å

e4kc5B3[B:3497-3645] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RhiE protein ; X-RAY DIFFRACTION 2.14Å

e4kc5C4[C:3497-3645] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RhiE protein ; X-RAY DIFFRACTION 2.14Å

e4kc5D3[D:3497-3645] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RhiE protein ; X-RAY DIFFRACTION 2.14Å

e4opeA3[A:4658-4802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS ; X-RAY DIFFRACTION 2.590Å

e4opeC3[C:4658-4802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS ; ligands: NO3 ; X-RAY DIFFRACTION 2.590Å

e4opeD2[D:4658-4802] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS ; X-RAY DIFFRACTION 2.590Å

e4opeB2[B:4658-4801] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS ; X-RAY DIFFRACTION 2.590Å

e4na1B3[B:447-615] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYKETIDE SYNTHASE PKSJ ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e4tktA4[A:3589-3754] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AT-less polyketide synthase ; ligands: GOL,MES,SO4 ; X-RAY DIFFRACTION 2.4289Å

e4tl2A3[A:994-1069,A:1099-1180] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: CL,EPE

e4na2B3[B:447-614] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYKETIDE SYNTHASE PKSJ ; X-RAY DIFFRACTION 2.3Å

e4na1A2[A:457-614] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYKETIDE SYNTHASE PKSJ ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e4na2A4[A:457-615] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYKETIDE SYNTHASE PKSJ ; X-RAY DIFFRACTION 2.3Å

e4na3A1[A:457-614] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYKETIDE SYNTHASE PKSJ ; ligands: SO4 ; X-RAY DIFFRACTION 2.89Å

e4na3B1[B:457-615] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYKETIDE SYNTHASE PKSJ ; ligands: SO4 ; X-RAY DIFFRACTION 2.89Å

e4zdnA3[A:984-1069,A:1099-1180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AT-less polyketide synthase ; ligands: CL,EPE ; X-RAY DIFFRACTION 2.509Å

e5e5nA3[A:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 2.00Å

e5e5nB3[B:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 2.00Å

e5e5nC1[C:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 2.00Å

e5e5nD1[D:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 2.00Å

e5e6kA2[A:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; ligands: SO4 ; X-RAY DIFFRACTION 2.16Å

e5e6kB2[B:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 2.16Å

e5erbA1[A:447-615] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase ; X-RAY DIFFRACTION 4.20Å

e5erbB2[B:447-616] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase ; X-RAY DIFFRACTION 4.20Å

e5erbC1[C:447-616] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase ; X-RAY DIFFRACTION 4.20Å

e5erbD1[D:447-616] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase ; X-RAY DIFFRACTION 4.20Å

e5enyA3[A:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5enyC1[C:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5enyE2[E:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5enyG1[G:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5erfA1[A:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 3.1Å

e5erfB1[B:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 3.1Å

e5enyB2[B:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5enyD1[D:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5enyF1[F:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5enyH2[H:437-591] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polyketide synthase PksL ; X-RAY DIFFRACTION 4.00Å

e5elpD1[D:437-528,D:554-600] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS protein ; X-RAY DIFFRACTION 2.93Å

e5elpA3[A:445-528,A:554-599] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS protein ; X-RAY DIFFRACTION 2.93Å

e5elpC3[C:437-600] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS protein ; X-RAY DIFFRACTION 2.93Å

e5elpB3[B:437-600] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NRPS/PKS protein ; X-RAY DIFFRACTION 2.93Å

e4z37A2[A:2761-2933] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative mixed polyketide synthase/non-ribosomal peptide synthetase ; X-RAY DIFFRACTION 1.998Å

e4qyrA2[A:2970-3123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AT-less polyketide synthase ; ligands: CL ; X-RAY DIFFRACTION 2.9Å

e6mhkA1[A:438-588] Image Pymol Jmol Links: PDB, SCOP, CATH

Polyketide synthase ; X-RAY DIFFRACTION 1.93Å

e6mhlA3[A:431-590] Image Pymol Jmol Links: PDB, SCOP, CATH

Hybrid NRPS/PKS ; X-RAY DIFFRACTION 1.82Å

e6mhkB3[B:438-588] Image Pymol Jmol Links: PDB, SCOP, CATH

Polyketide synthase ; X-RAY DIFFRACTION 1.93Å

e6mhlB3[B:431-590] Image Pymol Jmol Links: PDB, SCOP, CATH

Hybrid NRPS/PKS ; X-RAY DIFFRACTION 1.82Å

e7s2xA1[A:434-597] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SalC ; X-RAY DIFFRACTION 2.85Å

e7s2xB2[B:435-597] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SalC ; ligands: K ; X-RAY DIFFRACTION 2.85Å

e7s2xC1[C:435-597] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SalC ; X-RAY DIFFRACTION 2.85Å

e7s2xD3[D:435-597] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SalC ; ligands: EPE ; X-RAY DIFFRACTION 2.85Å

e7zmaA3[A:2031-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zmaB2[B:2030-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskB7[B:961-1129] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskA7[A:961-1129] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskD7[D:961-1129] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskC7[C:961-1129] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zmdA2[A:959-1130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zmdB3[B:959-1130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskB5[B:2031-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskA5[A:2031-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskD5[D:2031-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zskC5[C:2031-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ELECTRON MICROSCOPY

e7zmcB2[B:2031-2200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; X-RAY DIFFRACTION 3.10Å

e7zmcA1[A:2030-2199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; X-RAY DIFFRACTION 3.10Å

e7zm9A3[A:959-1130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative polyketide synthase ; ligands: GOL,PEG ; X-RAY DIFFRACTION 1.62Å

e6iyoB1[B:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Type I modular polyketide synthase ; X-RAY DIFFRACTION 2.200Å

e8g4uA5[A:1916-2015] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EryAIII ; X-RAY DIFFRACTION 2.9Å

e8g4uD2[D:1916-2015] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EryAIII ; X-RAY DIFFRACTION 2.9Å

e8g4uC5[C:1915-2006] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EryAIII ; X-RAY DIFFRACTION 2.9Å

e8g4uB2[B:1918-2013] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EryAIII ; X-RAY DIFFRACTION 2.9Å

e5bp1A3[A:440-537] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mycocerosic acid synthase ; X-RAY DIFFRACTION 2.203Å

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