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Folate metabolism in filariae: enzymes associated with 5,10-methylenetetrahydrofolate.

Adult Brugia pahangi and Dirofilaria immitis were found to possess the following four enzymes that are associated with the cofactor 5,10-methylenetetrahydrofolate (CH2FH4): serine hydroxymethyltransferase, thymidylate synthetase, CH2FH4 dehydrogenase, and CH2FH4 reductase. The properties of the isoenzymes from the two filariae were virtually indistinguishable, except that diethylcarbamazine inhibited CH2FH4 reductase from B. pahangi 50% at 10 muM, but did not not affect the isoenzyme from D. immitis at 100 muM. The properties of these four filarial enzymes generally were similar to their counterparts from mosquitoes and mammalian sources, but several notable differences were identified.