Conformationally-restricted arginine analogues as alternative substrates and inhibitors of nitric oxide synthases

Younghee Lee, Michael A. Marletta, Pavel Martasek, Linda J. Roman, Bettie Sue Siler Masters, Richard B. Silverman

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27 Scopus citations


Conformationally restricted arginine analogues (1-5) were synthesized and found to be alternative substrates or inhibitors of the three isozymes of nitric oxide synthase (NOS). A comparison of k(cat)/K(m) values shows that (E)-3,4-didehydro-d,l-arginine (1) is a much better substrate than the corresponding (Z)-isomer (2) and 3-guanidino-d,l-phenylglycine (3), although none is as good a substrate as is arginine; 5-keto-d,l-arginine (4) is not a substrate, but is an inhibitor of the three isozymes. Therefore, it appears that arginine binds to all of the NOS isozymes in an extended (E-like) conformation. None of the compounds exhibits time-dependent inhibition of NOS, but they are competitive reversible inhibitors. Based on the earlier report that N(ω)-propyl-l-arginine is a highly selective nNOS inhibitor (Zhang, H. Q.; Fast, W.; Marletta, M.; Martasek, P.; Silverman, R. B. J. Med. Chem. 1997, 40, 3869), (E)-N(ω)-propyl-3,4-didehydro-d,l-arginine (5) was synthesized, but it was shown to be weakly potent and only a mildly selective inhibitor of NOS. Imposing conformational rigidity on an arginine backbone does not appear to be a favorable approach for selective NOS inhibition. Copyright (C) 1999 Elsevier Science Ltd.

Original languageEnglish (US)
Pages (from-to)1097-1104
Number of pages8
JournalBioorganic and Medicinal Chemistry
Issue number6
StatePublished - Jun 1999


  • Arginine analogues
  • Conformationally-restricted
  • Enzyme inhibition
  • Nitric oxide synthase

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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