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| Subject | Predicate | Object |
|---|---|---|
| http://purl.uniprot.org/citations/10841763 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/10841763 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/10841763 | http://www.w3.org/2000/01/rdf-schema#comment | "Human topoisomerase I helps to control the level of DNA supercoiling in cells and is vital for numerous DNA metabolic events, including replication, transcription, and recombination. The 2.6 A crystal structure of human topoisomerase I in noncovalent complex with a DNA duplex containing a cytosine at the -1 position of the scissile strand rather than the favored thymine is reported. The hydrogen bond between the O2 position of this -1 base and the epsilon-amino of the conserved Lys-532 residue, the only base-specific contact observed previously in the human topoisomerase I-DNA interaction, is maintained in this complex. Several unique features of this structure, however, have implications for the DNA-binding and active-site mechanisms of the enzyme. First, the ends of the DNA duplex were observed to shift by up to 5.4 A perpendicular to the DNA helical axis relative to structures reported previously, suggesting a novel degree of plasticity in the interaction between human topoisomerase I and its DNA substrate. Second, 12 additional residues at the NH(2) terminus of the protein (Trp-203-Gly-214) could be built in this structure, and they were found to pack against the putative hinge region implicated in the clamping of the enzyme around duplex DNA. Third, a water molecule was observed adjacent to the scissile phosphate and the active-site residues; the potential specific base character of this solvent molecule in the active-site mechanism of the enzyme is discussed. Fourth, the scissile phosphate group was found to be rotated by 75 degrees, bringing Lys-532 into hydrogen-bonding distance of one of the nonbridging phosphate oxygens. This orientation of the scissile phosphate group implicates Lys-532 as a fifth active-site residue, and also mimics the orientation observed for the 3'-phosphotyrosine linkage in the covalent human topoisomerase I-DNA complex structure. The implications of these structural features for the mechanism of the enzyme are discussed, including the potential requirement for a rotation of the scissile phosphate group during DNA strand cleavage and covalent attachment."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.org/dc/terms/identifier | "doi:10.1021/bi992690t"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.org/dc/terms/identifier | "doi:10.1021/bi992690t"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/author | "Hol W.G.J."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/author | "Hol W.G.J."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/author | "Redinbo M.R."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/author | "Redinbo M.R."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/author | "Champoux J.J."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/author | "Champoux J.J."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/date | "2000"xsd:gYear |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/date | "2000"xsd:gYear |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/name | "Biochemistry"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/name | "Biochemistry"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/pages | "6832-6840"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/pages | "6832-6840"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/title | "Novel insights into catalytic mechanism from a crystal structure of human topoisomerase I in complex with DNA."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/title | "Novel insights into catalytic mechanism from a crystal structure of human topoisomerase I in complex with DNA."xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/volume | "39"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://purl.uniprot.org/core/volume | "39"xsd:string |
| http://purl.uniprot.org/citations/10841763 | http://www.w3.org/2004/02/skos/core#exactMatch | http://purl.uniprot.org/pubmed/10841763 |
| http://purl.uniprot.org/citations/10841763 | http://www.w3.org/2004/02/skos/core#exactMatch | http://purl.uniprot.org/pubmed/10841763 |
| http://purl.uniprot.org/citations/10841763 | http://xmlns.com/foaf/0.1/primaryTopicOf | https://pubmed.ncbi.nlm.nih.gov/10841763 |
| http://purl.uniprot.org/citations/10841763 | http://xmlns.com/foaf/0.1/primaryTopicOf | https://pubmed.ncbi.nlm.nih.gov/10841763 |