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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

X: Single-stranded right-handed beta-helix
H: Leucine-rich repeats
T: Leucine-rich repeats
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:

e3dzeA1[A:0-175] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ATP synthase subunit s, mitochondrial ; ligands: CD,MG,TRS ; X-RAY DIFFRACTION 1.100Å

e1io0A1[A:179-344] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TROPOMODULIN ; ligands: ZN ; X-RAY DIFFRACTION 1.45Å

e1ogqA1[A:1-313] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYGALACTURONASE INHIBITING PROTEIN ; ligands: ACT,NAG ; X-RAY DIFFRACTION 1.7Å

e1pgvA1[A:222-388] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

tropomodulin TMD-1 ; X-RAY DIFFRACTION 1.80Å

e3g06A1[A:171-486] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SspH2 (Leucine-rich repeat protein) ; X-RAY DIFFRACTION 1.9Å

e4nuzA2[A:448-636] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Endo-beta-N-acetylglucosaminidase F2 ; X-RAY DIFFRACTION 1.905Å

e2ra8A2[A:79-357] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN Q64V53_BACFR ; X-RAY DIFFRACTION 1.95Å

e1dceA3[A:444-567] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (RAB GERANYLGERANYLTRANSFERASE ALPHA SUBUNIT) ; X-RAY DIFFRACTION 2.0Å

e1jl5A1[A:1034-1386] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER PROTEIN YOPM ; ligands: CA ; X-RAY DIFFRACTION 2.1Å

e2ca6A1[A:2-345] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RAN GTPASE-ACTIVATING PROTEIN 1 ; X-RAY DIFFRACTION 2.200Å

e2astB2[B:2136-2419] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

S-phase kinase-associated protein 2 ; ligands: BEN ; X-RAY DIFFRACTION 2.3Å

e5zb2A1[A:164-544] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA repair protein RAD7 ; ligands: 9FO,GOL,P33,P6G,PG0 ; X-RAY DIFFRACTION 2.300Å

e4j0mB2[B:31-362] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERINE/THREONINE-PROTEIN KINASE BRI1-LIKE 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.5Å

e3rizA1[A:29-351] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN BRASSINOSTEROID INSENSITIVE 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.52Å

e4l3aA1[A:48-229] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Internalin K ; ligands: NA ; X-RAY DIFFRACTION 2.59Å

e3ojaA1[A:23-322] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LEUCINE-RICH IMMUNE MOLECULE 1 ; ligands: NAG ; X-RAY DIFFRACTION 2.7Å

e4nkhA1[A:162-397] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 ubiquitin-protein ligase sspH1 ; X-RAY DIFFRACTION 2.75Å

e4nkhB1[B:162-398] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 ubiquitin-protein ligase sspH1 ; X-RAY DIFFRACTION 2.75Å

e5hzlB2[B:54-204] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Lmo2445 protein ; ligands: CA,PG5 ; X-RAY DIFFRACTION 2.75Å

e3cvrA2[A:25-268] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INVASION PLASMID ANTIGEN ; X-RAY DIFFRACTION 2.8Å

e4nkgA1[A:162-394] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 ubiquitin-protein ligase sspH1 ; ligands: HEZ ; X-RAY DIFFRACTION 2.900Å

e4kxfK5[K:581-1023] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NLR FAMILY CARD DOMAIN-CONTAINING PROTEIN 4 ; X-RAY DIFFRACTION 3.2Å

e4pufA1[A:147-458] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 ubiquitin-protein ligase SlrP ; X-RAY DIFFRACTION 3.296Å

e5hzgF2[F:58-101,F:128-466,F:518-719] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

F-box/LRR-repeat MAX2 homolog ; X-RAY DIFFRACTION 3.3Å

e1kohA2[A:201-362] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TIP ASSOCIATING PROTEIN ; X-RAY DIFFRACTION 3.8Å

e2lz0A1[A:1-100] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ; SOLUTION NMR

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