Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices




Representatives:
e2gyqA1[A:1-160]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
ycfI, putative structural protein ; ligands: ACT,EDO,FE,NA,ZN ; X-RAY DIFFRACTION 1.40Å
e2gyqB1[B:3-159] Image Pymol Jmol Links: PDB, SCOP, CATH
ycfI, putative structural protein ; ligands: ACT,EDO,FE,ZN ; X-RAY DIFFRACTION 1.40Å
e1u7jA1[A:1-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Four-helix bundle model ; ligands: ZN ; SOLUTION NMR
e1u7jB1[B:1-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Four-helix bundle model ; ligands: ZN ; SOLUTION NMR
e2gs4B1[B:4-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PROTEIN YCIF ; X-RAY DIFFRACTION 2.0Å
e2gs4A1[A:3-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PROTEIN YCIF ; X-RAY DIFFRACTION 2.0Å
e3oghB1[B:-2-160] Image Pymol Jmol Links: PDB, SCOP, CATH
PROTEIN YCIE ; ligands: CL,FE,MG ; X-RAY DIFFRACTION 1.65Å
e4eruA1[A:0-158] Image Pymol Jmol Links: PDB, SCOP, CATH
YCIF BACTERIAL STRESS RESPONSE PROTEIN ; ligands: MG,MLT ; X-RAY DIFFRACTION 2.1Å
e3hiuB1[B:4-164] Image Pymol Jmol Links: PDB, SCOP, CATH
UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å
e3hiuC1[C:5-166] Image Pymol Jmol Links: PDB, SCOP, CATH
UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å
e3hiuD1[D:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH
UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å
e3oghA1[A:0-162] Image Pymol Jmol Links: PDB, SCOP, CATH
PROTEIN YCIE ; ligands: FE,MG ; X-RAY DIFFRACTION 1.65Å
e4eruB1[B:-2-156] Image Pymol Jmol Links: PDB, SCOP, CATH
YCIF BACTERIAL STRESS RESPONSE PROTEIN ; ligands: MG,MLT ; X-RAY DIFFRACTION 2.1Å
e3hiuA2[A:5-164] Image Pymol Jmol Links: PDB, SCOP, CATH
UNCHARACTERIZED PROTEIN ; ligands: EDO,NA ; X-RAY DIFFRACTION 1.85Å
e7tmvA1[A:11-169] Image Pymol Jmol Links: PDB, SCOP, CATH
Putative structural protein ; ligands: ZN ; X-RAY DIFFRACTION 2.300Å
e7tmvB1[B:10-164] Image Pymol Jmol Links: PDB, SCOP, CATH
Putative structural protein ; ligands: ZN ; X-RAY DIFFRACTION 2.300Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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
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