• 作者： 潘福; 白壽雄
• 作者服務機構： Contribution from the Institute of Biochemistry and the Kohlberg Laboratory, National Defense Medical Center
• 中文摘要： Hepatic cystathionase activity, but not methionine adenosyl-transferase and cystathionine synthetase, was markedly decreases in weanling female rats fed a vitamin B5-deficient diet, compared to that of the control animals fed ad libitum or pair-fed. The depressed enzyme activity was restored rapidly to normal by administering pyridoxine to the deficient rats. Excess pyridoxal phosphate added to enzyme reaction mixtures stimulated cystathionase in liver extracts from both control and deficient animals, but it did not raise activity of deficients to normal level. The data indicate that the amount of apocystathionase in rat liver is regulated by the availability of its coenzyme vitamin.
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