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
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
X: Molybdenum cofactor biosynthesis proteins
H: Molybdenum cofactor biosynthesis proteins
T: Molybdenum cofactor biosynthesis proteins
F: MoCF_biosynth
Representatives:
e1di6A1[A:2-191]
nonrep
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Pymol
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MOLYBDENUM COFACTOR BIOSYNTHETIC ENZYME ; ligands: SO4 ; X-RAY DIFFRACTION 1.45Å
e1uuyA1[A:3-163]
nonrep
Image
Pymol
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MOLYBDOPTERIN BIOSYNTHESIS CNX1 ; ligands: AMP,FMT,IMD,MTE,PPI ; X-RAY DIFFRACTION 1.45Å
e2g2cA1[A:1-163]
nonrep
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Pymol
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PUTATIVE MOLYBDENUM COFACTOR BIOSYNTHESIS PROTEIN ; ligands: NA ; X-RAY DIFFRACTION 1.5Å
e1mkzA1[A:3-172]
nonrep
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Pymol
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Molybdenum cofactor biosynthesis protein B ; ligands: ACY,SO4 ; X-RAY DIFFRACTION 1.60Å
e1y5eA1[A:12-166]
nonrep
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Pymol
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MOLYBDENUM COFACTOR BIOSYNTHESIS PROTEIN B ; X-RAY DIFFRACTION 1.9Å
e1uz5A4[A:181-328]
nonrep
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402AA LONG HYPOTHETICAL MOLYBDOPTERIN BIOSYNTHESIS MOEA PROTEIN ; ligands: SO4 ; X-RAY DIFFRACTION 2.05Å
e4ct8A1[A:1-172]
nonrep
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Pymol
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CINA-LIKE PROTEIN ; X-RAY DIFFRACTION 2.16Å
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