3'-(1,2,3-Triazol-1-yl)-3'-deoxythymidine analogs as substrates for human and Ureaplasma parvum thymidine kinase for structure-activity investigations

Bioorg Med Chem. 2010 May 1;18(9):3261-9. doi: 10.1016/j.bmc.2010.03.023. Epub 2010 Mar 15.

Abstract

The pathogenic mycoplasma Ureaplasma parvum (Up) causes opportunistic infections and relies on salvage of nucleosides for DNA synthesis and Up thymidine kinase (UpTK) provides the necessary thymidine nucleotides. The anti-HIV compound 3 -azido-3'-deoxythymidine (AZT) is a good substrate for TK. Methods for a rapid and efficient synthesis of new 3'-alpha-[1,2,3]triazol-3'-deoxythymidine analogs from AZT under Huisgen conditions are described. Thirteen 3'-analogues were tested with human cytosolic thymidine kinase (hTK1) and UpTK. The new analogs showed higher efficiencies (K(m)/V(max) values) in all cases with UpTK than with hTK1. Still, hTK1 was preferentially inhibited by 9 out of 10 tested analogs. Structural models of UpTK and hTK1 were constructed and used to explain the kinetic results. Two different binding modes of the nucleosides within the active sites of both enzymes were suggested with one predominating in the bacterial enzyme and the other in hTK1. These results will aid future development of anti-mycoplasma nucleosides.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Anti-Infective Agents* / chemical synthesis
  • Anti-Infective Agents* / chemistry
  • Anti-Infective Agents* / pharmacology
  • Enzyme Inhibitors* / chemical synthesis
  • Enzyme Inhibitors* / chemistry
  • Enzyme Inhibitors* / pharmacology
  • Humans
  • Inhibitory Concentration 50
  • Molecular Sequence Data
  • Molecular Structure
  • Sequence Alignment
  • Structure-Activity Relationship
  • Substrate Specificity
  • Thymidine Kinase / chemistry*
  • Thymidine Kinase / metabolism
  • Thymidine* / chemical synthesis
  • Thymidine* / chemistry
  • Thymidine* / pharmacology
  • Triazoles / chemical synthesis
  • Triazoles / chemistry
  • Triazoles / pharmacology
  • Ureaplasma* / drug effects
  • Ureaplasma* / enzymology
  • Zidovudine / chemical synthesis
  • Zidovudine / chemistry

Substances

  • Anti-Infective Agents
  • Enzyme Inhibitors
  • Triazoles
  • Zidovudine
  • Thymidine Kinase
  • Thymidine