The conformations of trimethoprim/E. coli dihydrofolate reductase complexes A 15N and 31P NMR study

Fu yung Huang, Qing Yang, Tai huang Huang, Leslie Gelbaum, Lee F. Kuyper

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Abstract

We have employed 15N and 31P NMR techniques to characterize the conformations of trimethoprim (TMP)/E. coli dihydrofolate reductase (DHFR) complexes in the presence and absence of NADPH and NADP+. A single conformation was observed for TMP/DHFR, NADP+/DHFR, NADPH/ DHFR and TMP/NADPH/DHFR complexes. In the ternary complex of TMP/NADP+/DHFR both the 15N and 31P spectra revealed the presence of two conformations. However, the conformations of TMP and NADP+ in the ternary complex may not be correlated, resulting in the possible existence of four conformations for the protein ternary complex.

Original languageEnglish (US)
Pages (from-to)44-46
Number of pages3
JournalFEBS Letters
Volume283
Issue number1
DOIs
StatePublished - May 20 1991

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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