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
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
X: Head and neck region of the ectodomain of paramyxoviruses fusion glycoprotein
H: Head and neck region of the ectodomain of paramyxoviruses fusion glycoprotein
T: Head and neck region of the ectodomain of paramyxoviruses fusion glycoprotein
F: Fusion_gly
Representatives:
e2b9bB1[B:20-362,B:432-477]
nonrep
Image
Pymol
Jmol Links:
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SCOP,
CATH, PubMed,
DOI
FUSION GLYCOPROTEIN F0 ; ligands: NAG ; X-RAY DIFFRACTION 2.85Å
e4mmr.1[A:26-103,B:137-400,B:463-513]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain & Fusion glycoprotein F2 ; X-RAY DIFFRACTION 3.1Å
e1g5gA1[A:33-105,A:171-381,A:438-454]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Fusion glycoprotein F0 ; ligands: NAG ; X-RAY DIFFRACTION 3.30Å
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