Ferre J, Jacobson KB. Formation of beta,gamma-methylene-7,8-dihydroneopterin 3'-triphosphate from beta,gamma-methyleneguanosine 5'-triphosphate by GTP cyclohydrolase I of Escherichia coli.
Arch Biochem Biophys 1984;
233:475-80. [PMID:
6385856 DOI:
10.1016/0003-9861(84)90470-3]
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Abstract
GTP cyclohydrolase I of Escherichia coli converts [beta,gamma-methylene] GTP to a fluorescent product that is characterized as [beta,gamma-methylene]dihydroneopterin triphosphate. Interaction between the GTP analog and the enzyme gave a Ki of 3.0 microM, which may be compared to the Km of 0.1 microM for GTP. This new analog of dihydroneopterin triphosphate may, in turn, be converted to the same greenish-yellow pteridines (compounds X, X1, and X2) that are obtained from dihydroneopterin triphosphate. Because of its stability to phosphatase action, this analog may be useful for studies in pteridine metabolism.
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