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Effect of HCO3- and carbon dioxide at various concentrations on activity of certain enzymes

Mel'nikhuk, D.A.; Siliunova, N.V.; Shevchenko, M.I.

Ukrainskii Biokhimicheskii Zhurnal 52(2): 164-166

1980

ISSN/ISBN: 0201-8470
PMID: 6770515
Document Number: 164595
The paper deals with the effect of changes in the concentration of carbonic acid in the medium on the reaction rate catalyzed with enzymes of various spectrum of the action. It is shown that the presence of carbonic acid in the medium reaction increases the rate of reactions catalyzed with lactate dehydrogenase of the rabbit liver soluble fraction, with glucose-6-phosphate dehydrogenase from yeast and trypsin. Under the same conditions the reaction rate catalyzed with glucose-6-phosphate dehydrogenase of the rabbit liver soluble fraction and with ATP-citrate (pro-3S)-lyase is considerably decreased. Changes in the carbonic acid concentrations within the physiological limits are found to have no effect on lactate dehydrogenase from the cattle heart and chymotrypsin.

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