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Regulation of hepatic betaine homo cysteine methyl transferase ec 2.1.1.5 by dietary methionine


, : Regulation of hepatic betaine homo cysteine methyl transferase ec 2.1.1.5 by dietary methionine. Biochemical and Biophysical Research Communications 108(1): 344-348

The hepatic activity of betaine-homocysteine methyltransferase is a complex function of the content of methionine in the diet. Enzyme levels are lower in the livers of rats fed a 0.3% methionine diet than in livers of animals maintained on either methionine-free or excessive methionine (1.0%) rations. Because activities are increased at both extremes of the spectrum of dietary methionine intake, the betaine-homocysteine methyltransferase reaction may function both to maintian tissue concentrations of methionine when intake of this amino acid is limited and to remove homocysteine when methionine intake is excessive.

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Sinha, R.K.; Maître, P.; Piccirillo, S.; Chiavarino, B.; Crestoni, M.Elisa.; Fornarini, S., 2010: Cysteine radical cation: A distonic structure probed by gas phase IR spectroscopy. The interest in the radical cations of amino acids is twofold. On the one hand, these species are relevant in enzymatic catalysis and in oxidative damage of proteins. On the other hand, as constituents of peptides and proteins, they aid the mass s...

Lüning, K.; Kadel, P.; Pang, S., 2008: Control Of Reproduction Rhythmicity By Environmental And Endogenous Signals In Ulva Pseudocurvata (Chlorophyta)(1). A field population of Ulva pseudocurvata Koeman et C. Hoek (hereafter termed Ulva) at Sylt Island (North Sea, Germany) exhibited biweekly peaks of gametophytic reproduction during the colder seasons and approximately weekly peaks during summer. Th...

Anonymous, 2012: Glacial-interglacial variations in sediment organic carbon accumulation and benthic foraminiferal assemblages on the Bermuda Rise ODP Site 163 during MIS 13 to. We have determined organic carbon concentrations and isotopic compositions and benthic foraminiferal assemblages in sediments deposited between ?500 and 340 ka at ODP Site 1063 on the northeastern flank of the Bermuda Rise. This time interval incl...