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- W1444792258 abstract "Publisher Summary This chapter focuses on S-Adenosylmethionine. S-Adenosylmethionine:homocysteine methyltransferase was first isolated from cell-free extracts of Aerobacter aerogenes and Saccharomyces cerevisiae . Subsequently, this enzyme was found in extracts of various microorganisms, plant seeds, and rat liver. Commercial bakers yeast has been used as the source material for the purification and characterization of the enzyme. Methionine formed by the methyltransferase reaction is measured by separating the radioactive product from the radioactive substrate with column chromatography, and counting the radioactivity of the eluted product in a liquid scintillation spectrometer. One unit of activity is defined as the amount of enzyme that catalyzes the synthesis of 1.0 micromole of methionine per hour under standard assay conditions. Crude extracts of various bacteria catalyze the enzymatic decomposition of S-adenosylmethionine, as well as methyl transfer from S-adenosylmethionine to homocysteine. The radioactive decomposition products of S-adenosylmethionine are eluted with water from Dowex 50-Li + columns, so that control values of reactions without homocysteine must be subtracted from the values of complete reaction mixtures." @default.
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- W1444792258 date "1971-01-01" @default.
- W1444792258 modified "2023-10-02" @default.
- W1444792258 title "[192] S-adenosylmethionine: l-homocysteine S-methyltransferase (Saccharomyces cerevisiae)" @default.
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- W1444792258 doi "https://doi.org/10.1016/0076-6879(71)17069-3" @default.
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