Download MendeleySolution structure of anti-HIV-1 and anti-tumor protein MAP30: structural insights into its multiple functions.
Wang, Y.X., Neamati, N., Jacob, J., Palmer, I., Stahl, S.J., Kaufman, J.D., Huang, P.L., Huang, P.L., Winslow, H.E., Pommier, Y., Wingfield, P.T., Lee-Huang, S., Bax, A., Torchia, D.A.(1999) Cell 99: 433-435
- PubMed: 10571185
- DOI: https://doi.org/10.1016/s0092-8674(00)81529-9
- Primary Citation of Related Structures:
1D8V - PubMed Abstract:
We present the solution structure of MAP30, a plant protein with anti-HIV and anti-tumor activities. Structural analysis and subsequent biochemical assays lead to several novel discoveries. First, MAP30 acts like a DNA glycosylase/apurinic (ap) lyase, an additional activity distinct from its known RNA N-glycosidase activity toward the 28S rRNA. Glycosylase/ap lyase activity explains MAP30's apparent inhibition of the HIV-1 integrase, MAP30's ability to irreversibly relax supercoiled DNA, and may be an alternative cytotoxic pathway that contributes to MAP30's anti-HIV/anti-tumor activities. Second, two distinct, but contiguous, subsites are responsible for MAP30's glycosylase/ap lyase activity. Third, Mn2+ and Zn2+ interact with negatively charged surfaces next to the catalytic sites, facilitating DNA substrate binding instead of directly participating in catalysis.
Organizational Affiliation:
Molecular Structural Biology Laboratory, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892-4310, USA.
