期刊
BIOCHEMISTRY
卷 43, 期 38, 页码 12189-12197出版社
AMER CHEMICAL SOC
DOI: 10.1021/bi0487241
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资金
- NIAID NIH HHS [AI51438] Funding Source: Medline
- NIGMS NIH HHS [GM30301] Funding Source: Medline
Escherichia coli 2-C-methyl-D-erythritol-4-phosphate cytidyltransferase (YgbP or IspD) catalyzes the conversion of 2-C-methyl-D-erythritol 4-phosphate (MEP) and cytidine triphosphate (CTP) to 4-diphosphocytidyl-2-C-methylerythritol (CDPME). Pulse chase experiments established that the reaction involves an ordered sequential mechanism with mandatory initial binding of CTP. On the basis of analysis of the previously reported crystal structures of apo-YgbP as well as YgbP complexed with both CTP. Mg2+ and CDPME.Mg2+ [Richard, S. B., Bowman, M. E., Kwiatkowski, W., Kang I., Chow, C., Lillo, A. M., Cane, D. E., and Noel, J. P. (2001) Nat. Struct. Biol. 8, 641-648], a group of active site residues were selected for site-directed mutagenesis and steady-state kinetic analysis. Both Lys27 and Lys213 were shown to be essential to catalytic activity, consistent with their proposed role in stabilization of a pentacoordinate phosphate transition state resulting from in-line attack of the MEP phosphate on the a-phosphate of CTP. In addition, Thr140, Arg109, Asp 106, and Thr165 were all shown to play critical roles in the binding and proper orientation of the MEP substrate.
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