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
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
looks like an elaborated ferredoxin
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