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: Sterol carrier protein-like
H: LytR-Cps2A-Psr (LCP) enzymes
T: LytR-Cps2A-Psr (LCP) enzymes
F: LytR_cpsA_psr
Representatives:
e2xxpA2[A:214-484]
nonrep
Image
Pymol
Jmol Links:
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CATH, PubMed,
DOI
CPS2A ; ligands: DSL,PEG ; X-RAY DIFFRACTION 1.69Å
e3mejA1[A:51-323]
nonrep
Image
Pymol
Jmol Links:
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CATH
transcriptional regulator ywtF ; ligands: CL ; X-RAY DIFFRACTION 2.35Å
e3pe5A1[A:101-378]
nonrep
Image
Pymol
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CATH
UNCHARACTERIZED PROTEIN ; X-RAY DIFFRACTION 2.38Å
e3nxhA1[A:72-331]
nonrep
Image
Pymol
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CATH
transcriptional regulator yvhJ ; X-RAY DIFFRACTION 2.584Å
e3owqA1[A:70-320]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
LIN1025 PROTEIN ; X-RAY DIFFRACTION 2.61Å
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