Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
X: HTH
H: HTH
T: tri-helical
F: Homeodomain
Representatives:
e1pufA1[A:193-269]
nonrep
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HOMEOBOX PROTEIN HOX-A9 ; X-RAY DIFFRACTION 1.9Å
e1e3oC1[C:104-160]
nonrep
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OCTAMER-BINDING TRANSCRIPTION FACTOR 1 ; X-RAY DIFFRACTION 1.900Å
e1k61A1[A:132-191]
nonrep
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MATING-TYPE PROTEIN ALPHA-2 ; X-RAY DIFFRACTION 2.1Å
e1p7iA1[A:3-55]
nonrep
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Segmentation polarity homeobox protein engrailed ; ligands: NHE ; X-RAY DIFFRACTION 2.1Å
e1le8A1[A:74-126]
nonrep
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MATING-TYPE PROTEIN A-1 ; X-RAY DIFFRACTION 2.3Å
e1bw5A1[A:1-66]
nonrep
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INSULIN GENE ENHANCER PROTEIN ISL-1 ; SOLUTION NMR
e1fjlA1[A:0-64]
nonrep
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PAIRED PROTEIN ; X-RAY DIFFRACTION
e1s7eA1[A:103-152]
nonrep
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Hepatocyte nuclear factor 6 ; SOLUTION NMR
e1uhsA1[A:1-72]
nonrep
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Pymol
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homeodomain only protein ; SOLUTION NMR
e1vndA1[A:1-77]
nonrep
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VND/NK-2 PROTEIN ; SOLUTION NMR
e1x2mA1[A:8-59]
nonrep
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Pymol
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LAG1 longevity assurance homolog 6 ; SOLUTION NMR
F: Unmapped domains
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
T: DNA-binding domain of intron-encoded endonucleases
lacks the N-terminal helix, circularly permuted wing
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
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