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
Representatives:
e3n5lA1[A:26-112,A:228-331] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Binding protein component of ABC phosphonate transporter ; ligands: CL,EDO,SO4,UNL ; X-RAY DIFFRACTION 1.97Å
e3n5lA2[A:113-227] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Binding protein component of ABC phosphonate transporter ; ligands: EDO,SO4,UNL ; X-RAY DIFFRACTION 1.97Å
e8ed5A2[A:129-234] Image Pymol Jmol Links: PDB, SCOP, CATH
; X-RAY DIFFRACTION 1.79Å
e8ed5A1[A:41-137,A:235-301] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: GOL ; X-RAY DIFFRACTION 1.79Å
e3n5lB1[B:113-233] Image Pymol Jmol Links: PDB, SCOP, CATH
Binding protein component of ABC phosphonate transporter ; ligands: EDO,SO4,UNL ; X-RAY DIFFRACTION 1.97Å
e5jvbB2[B:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphonate ABC transporter, periplasmic phosphonate-binding protein ; ligands: 2PO ; X-RAY DIFFRACTION 1.95Å
e5jvbA1[A:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphonate ABC transporter, periplasmic phosphonate-binding protein ; ligands: 2PO ; X-RAY DIFFRACTION 1.95Å
e5lq1A2[A:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphonate ABC transporter, periplasmic phosphonate-binding protein ; ligands: GB ; X-RAY DIFFRACTION 1.41Å
e5lq5A2[A:91-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative phosphonate binding protein for ABC transporter ; ligands: PO3 ; X-RAY DIFFRACTION 1.46Å
e5lv1A2[A:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PtxB ; ligands: 78T ; X-RAY DIFFRACTION 2.12Å
e5o2kA1[A:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; X-RAY DIFFRACTION 2.1Å
e5lq1B2[B:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphonate ABC transporter, periplasmic phosphonate-binding protein ; ligands: GB ; X-RAY DIFFRACTION 1.41Å
e5lq8A2[A:91-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative phosphonate binding protein for ABC transporter ; ligands: GB ; X-RAY DIFFRACTION 1.52Å
e5lv1C2[C:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PtxB ; ligands: 78T ; X-RAY DIFFRACTION 2.12Å
e5lv1B1[B:101-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PtxB ; ligands: 78T ; X-RAY DIFFRACTION 2.12Å
e5o2jA1[A:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; ligands: 2PO ; X-RAY DIFFRACTION 1.52Å
e5o2kD1[D:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; X-RAY DIFFRACTION 2.1Å
e5o2kB2[B:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; X-RAY DIFFRACTION 2.1Å
e5o2kC2[C:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; X-RAY DIFFRACTION 2.1Å
e5o2kE2[E:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; X-RAY DIFFRACTION 2.1Å
e5o2kF1[F:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; X-RAY DIFFRACTION 2.1Å
e5o37A2[A:95-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein PtxB ; ligands: GB ; X-RAY DIFFRACTION 1.37Å
e5ub3A2[A:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: CL ; X-RAY DIFFRACTION 1.9Å
e5ub4A1[A:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: PO4 ; X-RAY DIFFRACTION 2.09Å
e5ub4B1[B:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: CL,PO4 ; X-RAY DIFFRACTION 2.09Å
e5ub6A1[A:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: POP ; X-RAY DIFFRACTION 2.2Å
e5ub6B1[B:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: POP ; X-RAY DIFFRACTION 2.2Å
e5ub7A1[A:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: ATP ; X-RAY DIFFRACTION 2.48Å
e5ub7B2[B:115-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphate-binding protein ; ligands: ATP ; X-RAY DIFFRACTION 2.48Å
e5me4A2[A:111-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein HtxB ; ligands: HP4 ; X-RAY DIFFRACTION 1.52Å
e6eskA1[A:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 1.75Å
e6esvA1[A:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; ligands: PO4 ; X-RAY DIFFRACTION 1.78Å
e6eu7A1[A:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7B1[B:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7C1[C:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7D2[D:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7E2[E:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7F1[F:132-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6emnA1[A:111-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein HtxB ; ligands: 78T,EDO ; X-RAY DIFFRACTION 1.25Å
e6ghqA2[A:111-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein HtxB ; ligands: BTB,EDO,SO4 ; X-RAY DIFFRACTION 1.53Å
e6ghtA2[A:111-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphite transport system-binding protein HtxB ; ligands: ACY,HP4 ; X-RAY DIFFRACTION 1.12Å
e6xabA2[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: ACT ; X-RAY DIFFRACTION 1.78Å
e6xadA1[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: FMT ; X-RAY DIFFRACTION 1.89Å
e6x8wA1[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: SO4 ; X-RAY DIFFRACTION 1.97Å
e6x9gA2[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: MLI ; X-RAY DIFFRACTION 1.68Å
e6xl2A1[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: ART ; X-RAY DIFFRACTION 1.74Å
e7l22A2[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: SO4 ; X-RAY DIFFRACTION 1.92Å
e6x6bA2[A:139-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ArrX ; ligands: PG4,SO4 ; X-RAY DIFFRACTION 1.67Å
e7s6gA2[A:101-201] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphonate ABC type transporter/ substrate binding component ; ligands: CL,EDO,PO4 ; X-RAY DIFFRACTION 1.80Å
e7zckC1[C:89-201] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphonate ABC type transporter/ substrate binding component ; ligands: CL,PO4 ; X-RAY DIFFRACTION 1.80Å
e6eskA2[A:41-140,A:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; ligands: GOL ; X-RAY DIFFRACTION 1.75Å
e6esvA2[A:42-140,A:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; ligands: PO4 ; X-RAY DIFFRACTION 1.78Å
e6eu7A2[A:45-140,A:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7B2[B:44-140,B:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7C2[C:45-140,C:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7D1[D:48-140,D:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7E1[E:48-140,E:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
e6eu7F2[F:48-140,F:238-304] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative periplasmic phosphite-binding-like protein (Pbl) PtxB-like protein designated AioX ; X-RAY DIFFRACTION 3.0Å
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