Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
X: HTH
H: HTH
T: tetra-helical, lambda repressor-like
F: HTH_3
Representatives:
e2r1jL1[L:3-68]
nonrep
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Repressor protein C2 ; X-RAY DIFFRACTION 1.53Å
e2b5aA1[A:1-77]
nonrep
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C.BclI ; ligands: ACY ; X-RAY DIFFRACTION 1.54Å
e2ictA1[A:8-94]
nonrep
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antitoxin higa ; X-RAY DIFFRACTION 1.630Å
e2bnmA2[A:6-76]
nonrep
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EPOXIDASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.7Å
e1lmb31[3:6-92]
nonrep
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PROTEIN (LAMBDA REPRESSOR) ; X-RAY DIFFRACTION 1.800Å
e1y9qA2[A:4-82]
nonrep
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transcriptional regulator, HTH_3 family ; ligands: MED ; X-RAY DIFFRACTION 1.9Å
e1b0nA1[A:1-68]
nonrep
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PROTEIN (SINR PROTEIN) ; ligands: ZN ; X-RAY DIFFRACTION 1.900Å
e1utxA1[A:1-66]
nonrep
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CYLR2 ; ligands: IOD,NA ; X-RAY DIFFRACTION 1.900Å
e2ppxA1[A:30-91]
nonrep
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UNCHARACTERIZED PROTEIN ATU1735 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.0Å
e3ivpA1[A:3-76]
nonrep
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PUTATIVE TRANSPOSON-RELATED DNA-BINDING PROTEIN ; X-RAY DIFFRACTION 2.02Å
e4rykA1[A:2-70]
nonrep
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Lmo0325 protein ; ligands: SUC ; X-RAY DIFFRACTION 2.09Å
e2awiA1[A:2-66]
nonrep
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PrgX ; X-RAY DIFFRACTION 2.25Å
e4jcxB1[B:1-95]
nonrep
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Csp231I C protein ; X-RAY DIFFRACTION 2.30Å
e4jqdE1[E:1-97]
nonrep
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Csp231I C protein ; X-RAY DIFFRACTION 2.75Å
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