The biochemical inhibition mode of bredinin-5'-monophosphate on DNA polymerase beta.
We reported previously [T. Horie, Y. Mizushina, M. Takemura, F. Sugawara, A. Matsukage, S. Yoshida, K. Sakaguchi, Int. J. Mol. Med., 1 (1998) 83-90.] that a 5'-monophosphate form (breMP) of bredinin, which has been used clinically as an immunosuppressive drug, selectively suppressed the activities of mammalian DNA polymerase alpha (pol. alpha) and beta (pol. beta). In a preliminary study of the action mode, for pol. beta, breMP acted by competing with, unexpectedly, not only the substrate but also with the template-primer. The mode might be attributable to the structure and function of pol. beta itself. We therefore investigated the biochemical inhibition mode of pol. beta in more detail by using two pol. beta fragments which were proteolytically separated into the template-primer-binding domain and the catalytic domain. BreMP inhibited only the catalytic activity of the catalytic domain fragment, and could not bind to the template-primer-binding domain fragment, suggesting that it directly competes with the substrate at its binding site of the catalytic domain, and indirectly, but simultaneously and competitively disturbs the template-primer incorporation into the template-primer-binding domain.[1]References
- The biochemical inhibition mode of bredinin-5'-monophosphate on DNA polymerase beta. Mizushina, Y., Matsukage, A., Sakaguchi, K. Biochim. Biophys. Acta (1998) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
