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:
e3pq1A3[A:62-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Poly(A) RNA polymerase ; X-RAY DIFFRACTION 3.100Å
e3pq1B3[B:62-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Poly(A) RNA polymerase ; X-RAY DIFFRACTION 3.100Å
e5a2xB3[B:50-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 3.10Å
e5a2vA2[A:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 1.82Å
e5a2vB2[B:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; ligands: CL ; X-RAY DIFFRACTION 1.82Å
e5a2wA1[A:51-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.50Å
e5a2wB1[B:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.50Å
e5a2xA2[A:51-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 3.10Å
e5a2yA3[A:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.75Å
e5a2yB3[B:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.75Å
e5a2zA3[A:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.45Å
e5a2zB2[B:52-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.45Å
e5a30A2[A:51-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.75Å
e5a30B3[B:51-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
MITOCHONDRIAL PROTEIN ; X-RAY DIFFRACTION 2.75Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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