Association of human origin recognition complex 1 with chromatin DNA and nuclease-resistant nuclear structures

Yasutoshi Tatsumi, Toshiki Tsurimoto, Katsuhiko Shirahige, Hiroshi Yoshikawa, Chikashi Obuse

研究成果: ジャーナルへの寄稿学術誌査読

43 被引用数 (Scopus)


An origin recognition complex (ORC) consisting of six polypeptides has been identified as a DNA replication origin-binding factor in Saccharomyces cerevisiae. Homologues of ORC subunits have been discovered among eukaryotes, and we have prepared monoclonal antibodies against a human homologue of ORC1 (hORC1) to study its localization in human cells. It was thus found to associate with nuclei throughout the cell cycle and to be resistant to nonionic detergent treatment, in contrast to MCM proteins, which are other replication factors, the association of which with nuclei is clearly dependent on the phase of the cell cycle. A characteristic feature of hORC1 is dissociation by NaCl in a narrow concentration range around 0.25 M, suggesting interaction with some specific partner(s) in nuclei. Nuclease treatment experiments and UV cross-linking experiments further indicated interaction with both nuclease-resistant nuclear structures and chromatin DNA. Although its DNA binding was unaffected, some variation in the cell cycle was apparent, the association with nuclear structures being less stable in the M phase. Interestingly, the less stable association occurred concomitantly with hyperphosphorylation of hORC1, suggesting that this hyperphosphorylation may be involved in M phase changes.

ジャーナルJournal of Biological Chemistry
出版ステータス出版済み - 2月 25 2000

!!!All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学
  • 細胞生物学


「Association of human origin recognition complex 1 with chromatin DNA and nuclease-resistant nuclear structures」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。