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:
e1ftrA2[A:149-296] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN\:TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; X-RAY DIFFRACTION 1.7Å
e2fhjB2[B:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: K,MFN ; X-RAY DIFFRACTION 2.0Å
e2fhjA2[A:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: H4Z,K,MFN,PE4 ; X-RAY DIFFRACTION 2.0Å
e2fhkB2[B:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: K,MFN ; X-RAY DIFFRACTION 2.0Å
e1m5sA2[A:146-297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; X-RAY DIFFRACTION 1.85Å
e1m5sC2[C:2146-2297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; X-RAY DIFFRACTION 1.85Å
e1m5hD2[D:3146-3297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1m5hC2[C:2146-2297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e2fhjC2[C:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: H4Z,K,MFN,PE3,PE4 ; X-RAY DIFFRACTION 2.0Å
e2fhjD2[D:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: K,MFN,PE4 ; X-RAY DIFFRACTION 2.0Å
e1m5hB2[B:1146-1297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1m5sD2[D:3146-3297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; X-RAY DIFFRACTION 1.85Å
e1m5hF2[F:5146-5297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1m5sB2[B:1146-1297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; X-RAY DIFFRACTION 1.85Å
e1m5hA2[A:146-297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1m5hE2[E:4146-4297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e2fhkA2[A:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: K,MFN ; X-RAY DIFFRACTION 2.0Å
e1ftrC2[C:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN\:TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; X-RAY DIFFRACTION 1.7Å
e2fhkD2[D:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: K,MFN ; X-RAY DIFFRACTION 2.0Å
e1m5hG2[G:6146-6297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1m5hH2[H:7146-7297] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1ftrD2[D:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN\:TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; X-RAY DIFFRACTION 1.7Å
e2fhkC2[C:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN--TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; ligands: K ; X-RAY DIFFRACTION 2.0Å
e1ftrB2[B:149-296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLMETHANOFURAN\:TETRAHYDROMETHANOPTERIN FORMYLTRANSFERASE ; X-RAY DIFFRACTION 1.7Å
e6s6yD1[D:153-309] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: GLU,K ; X-RAY DIFFRACTION 3.100Å
e6s6yH1[H:153-309] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: GLU,GOL,K ; X-RAY DIFFRACTION 3.100Å
e6s6yL2[L:153-309] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: CA,GLU,K ; X-RAY DIFFRACTION 3.100Å
e6s6yP1[P:153-309] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran--tetrahydromethanopterin formyltransferase ; ligands: GLU,K ; X-RAY DIFFRACTION 3.100Å
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