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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: dsRBD-like
H: Peptidyl-tRNA hydrolase domain-like
T: Peptidyl-tRNA hydrolase domain-like
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:

e1gqeA4[A:313-365] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RELEASE FACTOR 2 ; X-RAY DIFFRACTION 1.81Å

e5j4dJA3[JA:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.1Å

e5j4dOC3[OC:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.1Å

e2b64Y3[Y:288-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e3mr8V12[V:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e3d5cX8[X:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: MG

e3ms0V8[V:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1zbtA2[A:298-358] Image Pymol Jmol Links: PDB, SCOP, CATH

Peptide chain release factor 1 ; X-RAY DIFFRACTION 2.34Å

e3d5aX8[X:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: MG

e1mi6A4[A:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

peptide chain release factor RF-2 ; ELECTRON MICROSCOPY

e1ml5Z4[Z:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e4v4rAY4[AY:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 5.9Å

e4v63AX4[AX:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.2Å

e4v63CX4[CX:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.2Å

e4v7pAV4[AV:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.514Å

e4v7pDV4[DV:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.514Å

e5j30QY3[QY:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.200Å

e5j30XY1[XY:291-352] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.200Å

e5j3cQY3[QY:291-355] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.040Å

e5j3cXY1[XY:291-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.040Å

e5czpQY4[QY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ligands: MG ; X-RAY DIFFRACTION 3.300Å

e5czpXY4[XY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.300Å

e5dfeQY2[QY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.09997551079Å

e5dfeXY2[XY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.09997551079Å

e5mdv72[7:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e5mdw72[7:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e5mgpz3[z:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e5u4iv1[v:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e5h5u41[4:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e5u9fZ3[Z:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF2 ; ELECTRON MICROSCOPY

e5u9gZ4[Z:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF2 ; ELECTRON MICROSCOPY

e5o2rv1[v:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF1 ; ELECTRON MICROSCOPY

e1rq0A4[A:279-333] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 2.65Å

e7qh7p1[p:38-193] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptidyl-tRNA hydrolase ICT1, mitochondrial ; ELECTRON MICROSCOPY

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