New PDF release: Citric Acid Cycle

By John M. Lowenstein

ISBN-10: 0121818705

ISBN-13: 9780121818708

The severely acclaimed laboratory commonplace, Methods in Enzymology, is likely one of the such a lot hugely revered guides within the box of biochemistry. on account that 1955, every one quantity has been eagerly awaited, often consulted, and praised by way of researchers and reviewers alike. The sequence includes a lot fabric nonetheless correct this day - really a vital e-book for researchers in all fields of lifestyles sciences

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Method A The reagents required and full details of the procedure are described elsewhere in this volume [56]. 0 Acetyl-S-CoA, 8 mM, prepared as described by Stadtman:' Sodium oxaloacetate, l0 mM DTNB, 10 mM 1p. D. J. Weitzman, Biochem. J. 99, 18P (1966) ; this volume [56]. " P. A. Srere, It. Brazil, and L. Gonen, Acta Chem. Scand. 17, S129 (1963), ~E. R. Stadtman, "Col. I I I [137]. 22 REACTIONS ON THE CYCLE [5] at 30,000 g for 20 minutes. 0, containing 1 mM cysteine for 2 hours at 2-4 °. The dialyzing solution is changed once, after 1 hour.

The assay is run at 24 °. 1 mM c/s-aconitate. The reaction rate is considerably below maximum under these conditions. 0 ml. The reaction is started by adding the enzyme, and the decrease in absorbance at 240 m~ is followed with time. it is also possible to assay the enzyme in the presence of 2 mM cisaconitate using a light path of 1 em by increasing the wavelength of the light. Units. The disappearance of cis-aconitate is proportional to the time 28 REACTIONS ON THE CYCLE [6] over a wide variety of conditions.

The K,~ value for acetyl-CoA is 2-4/~M and that of oxaloacetate is 1-3 ~M. Effectors. The enzyme activity is inhibited by ATP > ADP > PP AMP in the order given, when each compound is tested at 5 mM. Mg ÷÷ above 5 mM also inhibits enzyme activity. Inhibition by ATP and pyrophosphate is competitive with respect to acetyl-CoA. pH Optimum. 5. cj. A. Hathaway and D. E. Atkinson, Biochem. Biophys. Res. Commzm. 20, 661 (1965). 7R. Parvin and D. E. Atkinson, unpublished observations. O ~ citrate + CoASH Assay Method 1 Principle.

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Citric Acid Cycle by John M. Lowenstein

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