GTP cyclohydrolase

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Guanosine triphosphate (GTP), the substrate of GTP cyclohydrolases Guanosintriphosphat protoniert.svg
Guanosine triphosphate (GTP), the substrate of GTP cyclohydrolases

GTP cyclohydrolases are enzymes that catalyze imidazole ring opening of guanosine triphosphate (GTP). [1] This reaction is the committed step in the biosynthesis of multiple coenzymes (such as riboflavin and folate), tRNA bases, and the phytotoxin toxoflavin. [1] Several GTP cyclohydrolases exist, which sometimes synthesize different products for different purposes:

These enzymes require divalent cations for catalysis. [1]

References

  1. 1 2 3 4 5 6 7 8 Gräwert, Tobias; Fischer, Markus; Bacher, Adelbert (Mar 4, 2013). "Structures and reaction mechanisms of GTP cyclohydrolases". IUBMB Life. 65 (4): 310–322. doi: 10.1002/iub.1153 . PMID   23457054. S2CID   5470658.
  2. Graham, David E.; Xu, Huimin; White, Robert H. (2002-12-01). "A Member of a New Class of GTP Cyclohydrolases Produces Formylaminopyrimidine Nucleotide Monophosphates" . Biochemistry. 41 (50): 15074–15084. doi:10.1021/bi0268798. ISSN   0006-2960. PMID   12475257.
  3. "ENZYME - 3.5.4.29 GTP cyclohydrolase IIa". enzyme.expasy.org. Retrieved 2023-01-23.