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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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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

X: Immunoglobulin-like beta-sandwich
H: C-terminal Ig-like domain in baseplate protein ORF48
T: C-terminal Ig-like domain in baseplate protein ORF48
F: BppU_IgG

PF18667

Representatives:

e3u6xS1[S:195-299] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; ligands: BR ; X-RAY DIFFRACTION 2.6Å

e5e7tA1[A:193-321] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Minor structural protein 4 ; X-RAY DIFFRACTION 2.9Å

e4v96AA3[AA:193-299] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AB2[AB:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AC2[AC:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AD2[AD:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AE2[AE:193-298] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AF2[AF:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AG2[AG:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AH2[AH:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AI2[AI:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AJ2[AJ:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AK2[AK:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AL2[AL:193-298] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AM2[AM:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AN2[AN:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AO2[AO:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AP2[AP:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AQ2[AQ:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

e4v96AR2[AR:193-299] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ORF48 ; X-RAY DIFFRACTION 3.8Å

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

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