of Alcaligenes eutrophus. the acetyl coenzyme A synthetase gene (acoE)

Mycobacterium avium complex (MAC) is resistant to trimethoprim, an inhibitor of bacterial dihydrofolate reductase (DHFR). A previously identified selective inhibitor of MAC DHFR, SRI-8858, was shown to have synergistic activity in combination with dapsone and sulfamethoxazole, two drugs that inhibit bacterial dihydropteroate synthase.

The major cyclic peptide cyanopeptolin 1138, produced by Planktothrix strain NIVA CYA 116, was characterized and shown to be structurally very close to the earlier-characterized oscillapeptin E. A cyanopeptolin gene cluster likely to encode the corresponding peptide synthetase was sequenced from the same strain. The 30-kb oci gene cluster contains two novel domains previously not detected in no...

The activities of 28 6-substituted 2,4-diaminoquinazolines, 2,4-diamino-5,6,7,8-tetrahydroquinazolines, and 2,4-diaminopteridines against Plasmodium falciparum were tested. The 50% inhibitory concentrations (IC(50)s) of six compounds were <50 nM, and the most potent compound was 2,4-diamino-5-chloro-6-[N-(2,5-dimethoxybenzyl)amino]quinazoline (compound 1), with an IC(50) of 9 nM. The activity o...

A total of 252 children were enrolled in a drug trial to assess the effect of minimal doses of sulfadoxine (Sdx) and pyrimethamine (Pyr). Parasite samples isolated from these patients were analyzed before and after treatment to investigate the level of drug-resistant strains. The parasite genes encoding dihydrofolate reductase (DHFR) and dihydropteroate synthase (DHPS) were assayed for point mu...

For monitoring efficacy of sulfadoxine/pyrimethamine intermittent preventive treatment for malaria during pregnancy, data obtained from studies of children seemed inadequate. High prevalence of triple and quadruple mutants in the dihydropteroate synthase and dihydrofolate reductase genes of Plasmodium falciparum parasites contrasts with the efficacy of sulfadoxine/pyrimethamine in reducing low ...