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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

H: LuxS, MPP, ThrRS/AlaRS common domain
T: ThrRS/AlaRS editing domain
F: tRNA_bind_4

PF18490 CL0094

Representatives:

e2cj9A2[A:-2-164] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.300Å

e2cimB2[B:-3-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.500Å

e2cj9B1[B:-3-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.300Å

e2cjaB2[B:-3-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.2Å

e2cjbB1[B:-3-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.700Å

e2cjaA2[A:-2-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.2Å

e2cimA2[A:1-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.500Å

e2cjbA4[A:-2-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.700Å

e3w3sA2[A:1-167] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TYPE-2 SERINE--TRNA LIGASE ; ligands: PT,SO4 ; X-RAY DIFFRACTION 3.1Å

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.

X: ClpS-like

contains a HTH motif

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