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

X: Tautomerase/MIF-like

X: Uncharacterized protein BTH I2711

X: Peptidase inhibitors family I69

X: Asparaginal-tRNA synthetase N-terminal domain

X: Flagellar hook protein FlgE D0 domain

X: Curli production assembly/transport component CsgF

X: Anti-LPS factor/recA domain

X: Obg GTP-binding protein C-terminal domain-like

X: Ribosomal protein L9 C-domain

X: Urease, gamma-subunit

X: C-terminal domain of nonstructural protein nsp4

X: Putative heterocyst differentiation inhibitor NpR1517

X: Head-to-tail joining protein W, gpW

X: XkdW-like

X: Hypothetical protein MTH677

X: GTF2I-like repeat

X: Ribosomal protein L35p

X: Archaea-specific ribosomal protein L46a

X: PB2 C-terminal domain-like

X: Peptidoglycan deacetylase N-terminal noncatalytic region

X: ERH-like

X: ssDNA binding protein VirE2

X: N-terminal a+b domain in urocanase (Pfam 01175)

X: CbiD-like (Pfam 01888) N-terminal domain

X: Prion-like

X: gp120 inner domain

X: Ribosomal protein L31e-like

X: SSHS domain

X: MTH1598-like

X: Reverse ferredoxin

X: Tetrapyrrole methylase C-terminal domain-like

X: ImmE5-like

X: Polycystin-mucolipin domain

X: UvrB-binding domain of UvrA

X: FAM3 superfamily

X: a+b domain in Ribosomal protein L1

X: Photosystem I subunit PsaD

X: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase

X: uncharacterized protein YP_926445.1

X: Insertion domain in phosphocholine transferase AnkX

X: HPr-like

X: EcoKMcrA modification binding domain

X: Allophycocyanin linker chain (domain)

X: Small outer capsid protein (Soc)

H: Small outer capsid protein (Soc)

T: Small outer capsid protein (Soc)

F: Soc

PF16855

Representatives:

e3ig9A1[A:2-76] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Soc small outer capsid protein ; ligands: IMD ; X-RAY DIFFRACTION 1.9Å

e3ig9B1[B:1-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Soc small outer capsid protein ; ligands: IMD ; X-RAY DIFFRACTION 1.9Å

e3ig9C1[C:2-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Soc small outer capsid protein ; ligands: IMD ; X-RAY DIFFRACTION 1.9Å

e3ig9D1[D:2-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Soc small outer capsid protein ; ligands: IMD ; X-RAY DIFFRACTION 1.9Å

e3igeA1[A:2-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Soc small outer capsid protein ; ligands: IMD ; X-RAY DIFFRACTION 2.54Å

e3igeB1[B:2-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Soc small outer capsid protein ; ligands: IMD ; X-RAY DIFFRACTION 2.54Å

e5vf3O1[O:2-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI