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dTMP biosynthesis in Archaea

G W Nyce1, R H White

  • 1Department of Biochemistry and Anaerobic Microbiology, Virginia Polytechnic Institute and State University, Blacksburg 24061-0308, USA.

Journal of Bacteriology
|February 1, 1996
PubMed
Summary
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Archaea thymidylate synthases synthesize deoxythymidine monophosphate (dTMP) using modified folates as C1 donors. This study reveals conserved dTMP biosynthesis mechanisms across different archaeal species.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Deoxythymidine monophosphate (dTMP) is essential for DNA synthesis in all domains of life.
  • Thymidylate synthases (TS) catalyze the de novo synthesis of dTMP, a reaction critical for cell proliferation.
  • The C1 donor utilized by TS varies across organisms, with 5,10-methylenetetrahydrofolate being common in Bacteria and Eukarya.

Purpose of the Study:

  • To investigate the biosynthesis of dTMP in two distinct archaeal species: Methanosarcina thermophila and Sulfolobus solfataricus.
  • To elucidate the specific C1 donors and cofactors involved in archaeal dTMP synthesis.
  • To compare archaeal thymidylate synthase mechanisms with those found in other life domains.

Main Methods:

  • Enzymatic assays using cell extracts from M. thermophila and S. solfataricus.

Related Experiment Videos

  • Isotopic labeling studies with deuterated formaldehyde ([methylene-2H2] formaldehyde) to trace carbon flow.
  • Characterization of C1 donor molecules, including tetrahydrosarcinapterin and a sulfopterin derivative.

    • Main Results:

    • In M. thermophila, dTMP biosynthesis involved dUMP and [methylene-2H2]-5,10-methylenetetrahydrosarcinapterin, generated in situ.
    • In S. solfataricus, a 5,10-methylenetetrahydro derivative of a modified folate (sulfopterin) acted as the C1 donor.
    • Both archaeal species utilize modified folates as C1 donors for dTMP synthesis, indicating a conserved core reaction.

    Conclusions:

    • Archaeal thymidylate synthases perform the fundamental dTMP biosynthesis reaction conserved across life.
    • Archaea uniquely employ modified folate derivatives, such as sarcinapterin and sulfopterin, as C1 donors.
    • These findings highlight the diversity in folate cofactor structures while maintaining enzymatic function in Archaea.