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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: Alpha-beta plaits
H: Anticodon-binding domain of PheRS
T: Anticodon-binding domain of PheRS
F: FDX-ACB

PF03147

Representatives:

e2rhsB6[B:704-800] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.2Å

e1jjcB5[B:682-785] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE BETA CHAIN ; X-RAY DIFFRACTION 2.6Å

e1pysB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.9Å

e2iy5B5[B:682-781] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE BETA CHAIN ; X-RAY DIFFRACTION 3.100Å

e1eiyB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 3.30Å

e1b70B5[B:682-775] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE ; X-RAY DIFFRACTION 2.7Å

e2amcB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; X-RAY DIFFRACTION 2.7Å

e2alyB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; X-RAY DIFFRACTION 2.6Å

e1b7yB5[B:682-775] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (PHENYLALANYL-TRNA SYNTHETASE) ; X-RAY DIFFRACTION 2.5Å

e2akwB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE BETA CHAIN ; X-RAY DIFFRACTION 2.8Å

e3hfzB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; X-RAY DIFFRACTION 2.899Å

e3pcoB2[B:695-795] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase, beta chain ; X-RAY DIFFRACTION 3.000Å

e3tehB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; X-RAY DIFFRACTION 2.85Å

e3hfvA4[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase, mitochondrial ; X-RAY DIFFRACTION 2.6Å

e2rhsD24[D:694-799] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; ligands: SO4 ; X-RAY DIFFRACTION 2.2Å

e2rhqB12[B:694-799] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase beta chain ; X-RAY DIFFRACTION 2.2Å

e3cmqA4[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase, mitochondrial ; X-RAY DIFFRACTION 2.2Å

e3tegA4[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHENYLALANYL-TRNA SYNTHETASE, MITOCHONDRIAL ; X-RAY DIFFRACTION 2.2Å

e3tupA4[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase, mitochondrial ; X-RAY DIFFRACTION 3.05Å

e3pcoD12[D:689-795] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanyl-tRNA synthetase, beta chain ; X-RAY DIFFRACTION 3.000Å

e4p71A1[A:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.79Å

e4p71B1[B:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.79Å

e4p72A1[A:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.62Å

e4p72B1[B:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.62Å

e4p73A1[A:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.03Å

e4p73B1[B:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.03Å

e4p74A1[A:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.70Å

e4p74B1[B:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.70Å

e4p75A1[A:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.96Å

e4p75B1[B:686-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.96Å

e4tvaB5[B:682-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.59Å

e5mghA1[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase, mitochondrial ; X-RAY DIFFRACTION 1.87Å

e5mguA2[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase, mitochondrial ; X-RAY DIFFRACTION 1.89Å

e5mgvA1[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase, mitochondrial ; X-RAY DIFFRACTION 2.05Å

e5mgwA2[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase, mitochondrial ; X-RAY DIFFRACTION 1.46Å

e6oz5B2[B:689-793] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.5Å

e6oz5D1[D:689-794] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 2.5Å

e6p24B4[B:689-793] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; ligands: EDO,PEG ; X-RAY DIFFRACTION 2.115Å

e6p24D1[D:689-794] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; ligands: EDO,HEZ,MG,PEG,PGE,TRS ; X-RAY DIFFRACTION 2.115Å

e6p26B5[B:689-793] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.16Å

e6p26D4[D:689-794] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.16Å

e6p8tA6[A:686-792] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.150Å

e6p8tB1[B:686-793] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.150Å

e6p8tE5[E:686-793] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.150Å

e6p8tF2[F:684-791] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; X-RAY DIFFRACTION 3.150Å

e7n8yB4[B:695-795] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; ELECTRON MICROSCOPY

e7n8yD4[D:695-795] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phenylalanine--tRNA ligase beta subunit ; ELECTRON MICROSCOPY

e8p8xA2[A:317-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 1.46Å

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

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