2-thiouracil is a selective inhibitor of neuronal nitric oxide synthase antagonising tetrahydrobiopterin-dependent enzyme activation and dimerisation.

Abstract:

:2-thiouracil (TU), an established antithyroid drug and melanoma-seeker, was found to selectively inhibit neuronal nitric oxide synthase (nNOS) in a competitive manner (K(i)=20 microM), being inactive on the other NOS isoforms. The drug apparently interfered with the substrate- and tetrahydrobiopterin (BH(4))-binding to the enzyme. It caused a 60% inhibition of H(2)O(2) production in the absence of L-arginine and BH(4), and antagonised BH(4)-induced dimerisation of nNOS, but did not affect cytochrome c reduction. These results open new perspectives in the understanding of the antithyroid action of TU and provide a new lead structure for the development of selective nNOS inhibitors to elucidate the interdependence of the substrate and pteridine sites and to modulate pathologically aberrant NO formation.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Palumbo A,d'Ischia M,Cioffi FA

doi

10.1016/s0014-5793(00)02194-3

keywords:

subject

Has Abstract

pub_date

2000-11-24 00:00:00

pages

109-12

issue

2-3

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(00)02194-3

journal_volume

485

pub_type

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