作者: H.L. Callahan , S.M. Beverley
DOI: 10.1016/S0021-9258(18)35743-0
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摘要: Methotrexate (MTX)-resistant mutants of the parasitic protozoan Leishmania have been used as models for mechanism and genetic basis drug resistance in trypanosomatids other cells. Three mechanisms to MTX, a dihydrofolate reductase inhibitor, described Leishmania: decreased uptake accumulation MTX via folate/MTX transporter, amplification overexpression reductase-thymidylate synthase gene, extrachromosomal H region DNA. We now identified hmtxr gene conferring using transfection-based approach. Data base searches show that predicted HMTXr protein is related members polyol dehydrogenase/carbonyl family aldoketo reductases, whose substrates include polyols, quinones, steroids, prostaglandins, fatty acids, pterins. therefore propose also an oxidoreductase suggest several biochemical could be exploited design parasite-specific inhibitors.