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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

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

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

e1rq0B4[B:668,B:679-732] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e1rq0C4[C:1068,C:1079-1132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e2fvoA4[A:268,A:279-332] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ELECTRON MICROSCOPY

e2b3tB6[B:303-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.10Å

e2b9mY4[Y:301-365] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e2ihr17[1:297-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PEPTIDE CHAIN RELEASE FACTOR 2 ; X-RAY DIFFRACTION 2.5Å

e4kfhY11[Y:315-378] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4kfkY7[Y:315-378] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: MG

e3f1eX7[X:316-378] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: MG

e3f1gX11[X:316-378] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e2wh1Y7[Y:302-356] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e2wh3Y7[Y:302-356] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e2x9rY7[Y:302-356] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e2x9tY7[Y:302-356] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4v4sAY3[AY:301-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; X-RAY DIFFRACTION 6.76Å

e4v5jAY3[AY:301-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PEPTIDE CHAIN RELEASE FACTOR 2 ; X-RAY DIFFRACTION 3.10Å

e4v5jCY3[CY:301-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PEPTIDE CHAIN RELEASE FACTOR 2 ; X-RAY DIFFRACTION 3.10Å

e4v9nAY3[AY:315-378] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Bacterial peptide chain release factor 2 (RF-2) ; X-RAY DIFFRACTION 3.400Å

e4v9nCY3[CY:315-378] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Bacterial peptide chain release factor 2 (RF-2) ; ligands: MG ; X-RAY DIFFRACTION 3.400Å

e4v67AX3[AX:316-378] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Bacterial peptide chain release factor 2 (RF-2) ; ligands: MG ; X-RAY DIFFRACTION 3.00Å

e4v67CX3[CX:316-378] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Bacterial peptide chain release factor 2 (RF-2) ; X-RAY DIFFRACTION 3.00Å

e4v5eAY4[AY:302-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PEPTIDE CHAIN RELEASE FACTOR 2 ; X-RAY DIFFRACTION 3.45Å

e4v5eCY4[CY:302-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PEPTIDE CHAIN RELEASE FACTOR 2 ; X-RAY DIFFRACTION 3.45Å

e5mdy72[7:316-369] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6bokGD2[GD:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.55Å

e6b4vJA3[JA:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.4Å

e6b4vNC1[NC:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.4Å

e6c5lAY2[AY:301-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.2Å

e6c5lCY1[CY:301-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.2Å

e6c4iv4[v:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6bokHD2[HD:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.55Å

e6bohKA1[KA:305-359] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.4Å

e6bohPC1[PC:305-359] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.4Å

e6dncMA2[MA:297-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ELECTRON MICROSCOPY

e6gxnv4[v:297-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF1 ; ELECTRON MICROSCOPY

e6gxmv2[v:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF1 ; ELECTRON MICROSCOPY

e6gwtv2[v:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF1 ; ELECTRON MICROSCOPY

e6gxov1[v:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF1 ; ELECTRON MICROSCOPY

e6orlA1[A:291-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ELECTRON MICROSCOPY

e6ost73[7:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6ot3A1[A:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6ouoA3[A:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6oskA2[A:291-355] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ELECTRON MICROSCOPY

e6osqA3[A:291-355] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1 ; ELECTRON MICROSCOPY

e6og783[8:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF2 ; ELECTRON MICROSCOPY

e6ogf82[8:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6ogg84[8:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e6szsz3[z:312-366] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 2 ; ELECTRON MICROSCOPY

e7nqhBL3[BL:283-352] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor 1-like, mitochondrial ; ELECTRON MICROSCOPY

e7o1cB94[B9:315-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF2 ; ELECTRON MICROSCOPY

e7oj084[8:316-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF2 ; ELECTRON MICROSCOPY

e8aknW2[W:297-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Peptide chain release factor RF1 ; ELECTRON MICROSCOPY

e7m5dA1[A:297-360] Image Pymol Jmol Links: PDB, SCOP, CATH

Peptide chain release factor 1 ; ELECTRON MICROSCOPY

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