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Pig liver electron transfer flavoprotein (ETF) is rapidly reduced by sarcosine and dimethylglycine dehydrogenases to the anionic semiquinone form, the subsequent formation of the flavoquinol form being a much slower process. In the presence of tetrahydrofolate the yield of anionic semiquinone at the end of the rapid phase of reduction of ETF is only about 10% less than without tetrahydrofolate, as judged by e.p.r. spectroscopy. Tetrahydrofolate does not alter the rate of reduction of ETF by either sarcosine or dimethylglycine dehydrogenase. Nevertheless, it was clearly demonstrated that tetrahydrofolate is a substrate for both sarcosine and dimethylglycine dehydrogenases and is converted to N5,10-methylenetetrahydrofolate.

The effect of tetrahydrofolate on the reduction of electron transfer flavoprotein by sarcosine and dimethylglycine dehydrogenases