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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

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

X: HUP domain-like
H: HUP domains
T: HUP domains
F: tRNA-synt_1

PF00133 CL0039

Representatives:

e1h3nA3[A:1-148,A:497-575] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LEUCYL-TRNA SYNTHETASE ; ligands: LEU,LMS ; X-RAY DIFFRACTION 2.0Å

e3ziuA1[A:1-151,A:319-402] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LEUCYL-TRNA SYNTHETASE ; ligands: GOL,LSS ; X-RAY DIFFRACTION 2.07Å

e1ffyA6[A:1-175,A:524-585] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ISOLEUCYL-TRNA SYNTHETASE ; ligands: MRC ; X-RAY DIFFRACTION 2.2Å

e1qu2A7[A:1-175,A:524-585] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ISOLEUCYL-TRNA SYNTHETASE ; ligands: MRC ; X-RAY DIFFRACTION 2.2Å

e1qu3A2[A:2-175,A:524-585] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ISOLEUCYL-TRNA SYNTHETASE ; ligands: MRC ; X-RAY DIFFRACTION 2.9Å

e3zjtA6[A:1-148,A:491-566] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LEUCYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.2Å

e1ileA3[A:1-170,A:515-583] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ISOLEUCYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.5Å

e4aq7A1[A:1-147,A:490-568] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LEUCINE--TRNA LIGASE ; ligands: LEU,LMS ; X-RAY DIFFRACTION 2.5Å

e1ivsA6[A:1-165,A:453-520] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VALYL-TRNA SYNTHETASE ; ligands: VAA ; X-RAY DIFFRACTION 2.9Å

e1wz2A1[A:4-174,A:510-643] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Leucyl-tRNA synthetase ; X-RAY DIFFRACTION

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.

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