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• W615270 abstract "1. A study was made of the effects of injected l-methionine on the activity of several enzymes of folate metabolism, and on the transport of methotrexate in liver preparations from vitamin B12-deficient ewes and their pair-fed controls receiving vitamin B12. 2. The activities of dihydrofolate reductase (EC 1.5.1.3) and 5-methyltetrahydrofolate–homocysteine transmethylase were significantly decreased in the liver of vitamin B12-deficient animals, but were unaffected by l-methionine. 3. The concentration of S-adenosyl-l-methionine in the liver of deficient animals was about one-half of that in normal animals, and was restored to normal by either vitamin B12 or l-methionine. 4. Methylenetetrahydrofolate reductase (EC 1.1.1.68) from sheep liver was inhibited by S-adenosyl-l-methionine in vitro, but not by concentrations of S-adenosyl-l-methionine found in the liver of vitamin B12-deficient animals after injection of physiological amounts of l-methionine. 5. Pteroylpolyglutamate synthetase activity was significantly increased in the liver of vitamin B12-deficient animals, and was decreased by intravenous injections of l-methionine. 6. l-Methionine injections increased the initial rate of uptake of methotrexate in liver slices from deficient animals and acted synergistically with vitamin B12 to increase the quantity taken up in 40min. The failure of folate metabolism in vitamin B12 deficiency can be satisfactorily explained if l-methionine similarly affects the membrane transport of naturally occurring folates. 7. Further details of the results have been deposited as Supplementary Publication SUP 50028 (4 pages) at the British Library (Lending Division), (formerly the National Lending Library for Science and Technology), Boston Spa, Yorks. LS23 7BQ, U.K., from whom copies may be obtained on the terms given in Biochem. J. (1973) 131, 5." @default.
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• W615270 date "1974-07-01" @default.
• W615270 modified "2023-10-14" @default.
• W615270 title "Folic acid metabolism in vitamin B12-deficient sheep. Effects of injected methionine on liver constituents associated with folate metabolism" @default.
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• W615270 doi "https://doi.org/10.1042/bj1420119" @default.
• W615270 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1168217" @default.
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