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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

X: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment
H: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment
T: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment
F: Topoisom_I_N

PF02919

Representatives:

e2b9sA2[A:60-145] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

topoisomerase I-like protein ; X-RAY DIFFRACTION 2.27Å

e1oisA2[A:159-251] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA TOPOISOMERASE I ; X-RAY DIFFRACTION

e1rrjA4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 2.3Å

e1k4sA4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA TOPOISOMERASE I ; X-RAY DIFFRACTION 3.2Å

e1seuA4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 3Å

e1r49A4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 3.13Å

e1t8iA4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 3Å

e1tl8A4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA TOPOISOMERASE I ; X-RAY DIFFRACTION 3.1Å

e1lpqA4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 3.14Å

e1a36A4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TOPOISOMERASE I ; X-RAY DIFFRACTION 2.800Å

e1a35A4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (DNA TOPOISOMERASE I) ; X-RAY DIFFRACTION 2.500Å

e1ej9A4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA TOPOISOMERASE I ; X-RAY DIFFRACTION 2.6Å

e1k4tA4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA TOPOISOMERASE I ; X-RAY DIFFRACTION 2.1Å

e1nh3A4[A:230-318] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 3.1Å

e1rr8C7[C:231-319] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 2.6Å

e1a31A7[A:215-319] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (TOPOISOMERASE I) ; X-RAY DIFFRACTION 2.1Å

e1sc7A1[A:230-319] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA TOPOISOMERASE I ; X-RAY DIFFRACTION 3.0Å

e6z03A4[A:17-108] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 2.197Å

e6z01A4[A:17-108] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 1.9Å

e6z01B2[B:17-108] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; ligands: CL ; X-RAY DIFFRACTION 1.9Å

e6z03B5[B:17-108] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA topoisomerase I ; X-RAY DIFFRACTION 2.197Å

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