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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

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

X: alpha/beta-Hammerhead/Barrel-sandwich hybrid
H: alpha/beta-Hammerhead/Barrel-sandwich hybrid
T: Single hybrid motif
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.

Representatives:

e2xhaA1[A:42-81,A:201-234] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTION ANTITERMINATION PROTEIN NUSG ; X-RAY DIFFRACTION 1.91Å

e2qj8A3[A:253-331] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Mlr6093 protein ; X-RAY DIFFRACTION 2.00Å

e3cdxF3[F:267-343] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Succinylglutamatedesuccinylase/aspartoacylase ; X-RAY DIFFRACTION 2.100Å

e2aukA1[A:1-83] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase beta' chain ; X-RAY DIFFRACTION 2.19Å

e2aukA2[A:84-189] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase beta' chain ; X-RAY DIFFRACTION 2.19Å

e1vf7A3[A:39-72,A:135-169] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MULTIDRUG RESISTANCE PROTEIN MEXA ; X-RAY DIFFRACTION 2.4Å

e2a69D10[D:1270-1330] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å

e2a69D2[D:166-217,D:387-394] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å

e2a69D3[D:395-448] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.5Å

e2o5iD10[D:1270-1330] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; ligands: ZN ; X-RAY DIFFRACTION 2.5Å

e2o5iD2[D:166-207,D:391-396] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; X-RAY DIFFRACTION 2.5Å

e2o5iD3[D:397-448] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA' CHAIN ; X-RAY DIFFRACTION 2.5Å

e1smyC6[C:592-662] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE BETA CHAIN ; ligands: MG ; X-RAY DIFFRACTION 2.7Å

e4tkoB2[B:42-76,B:244-278] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EmrA ; ligands: IPA ; X-RAY DIFFRACTION 2.85Å

e3ne5B1[B:119-156,B:206-241] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cation efflux system protein cusB ; X-RAY DIFFRACTION 2.898Å

e3dxjN5[N:1270-1330] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BACTRIAL RNA POLYMERASE BETA-PRIME SUBUNIT ; X-RAY DIFFRACTION 3.0Å

e3dxjN6[N:166-207,N:390-395] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BACTRIAL RNA POLYMERASE BETA-PRIME SUBUNIT ; X-RAY DIFFRACTION 3.0Å

e3dxjN7[N:208-215,N:341-389] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BACTRIAL RNA POLYMERASE BETA-PRIME SUBUNIT ; X-RAY DIFFRACTION 3.0Å

e3dxjN8[N:396-448] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BACTRIAL RNA POLYMERASE BETA-PRIME SUBUNIT ; X-RAY DIFFRACTION 3.0Å

e4ljzD8[D:1152-1215] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.5871Å

e3wodD1[D:396-447] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.6Å

e3wodD12[D:1270-1330] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.6Å

e3wodD3[D:209-216,D:341-388] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.6Å

e3wodD4[D:166-208,D:389-395] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.6Å

e5uh5D4[D:209-249] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.750Å

e5uh5D7[D:148-208] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.750Å

e5nwtD7[D:1133-1215] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 3.76Å

e3h94A3[A:119-156,A:206-240] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cation efflux system protein cusB ; X-RAY DIFFRACTION 3.84Å

e1l9uD8[D:1270-1330] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RNA POLYMERASE, BETA-PRIME SUBUNIT ; X-RAY DIFFRACTION 4Å

e4jkrD10[D:1136-1215] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-DIRECTED RNA POLYMERASE SUBUNIT BETA' ; X-RAY DIFFRACTION 4.20Å

e4wqtI4[I:395-448] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 4.400Å

e4wqtN4[N:166-216,N:364-394] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA-directed RNA polymerase subunit beta' ; X-RAY DIFFRACTION 4.400Å

e2k33A1[A:1-108] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AcrA ; SOLUTION NMR

e5byhD10[D:1134-1215] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

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