底物与丙酰辅酶a羧化酶结合的结构要求

C.S. Hegre, M.Daniel Lane
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引用次数: 7

摘要

进一步从牛肝线粒体中纯化丙酰辅酶a羧化酶(EC 6.4.1.3)。根据目前和早期的研究,可以得出结论,羧化酶通过辅酶a片段结合酰基辅酶a底物。丙酰辅酶a、丙酰去磷酸辅酶a和丙酰泛氨酸羧化反应的相对最大速度分别为1.0、0.29和0.014;相同基质的Km值分别为2.6·10−4、2.8·10−3和2.4·10−2 M。不能证明丙炔- n -乙酰半胱胺的酶羧化作用。辅酶A和3′-AMP对丙酰辅酶A的羧化反应具有竞争性抑制作用,而2′-AMP和5′-AMP的抑制作用为混合型。酰基辅酶a底物与羧化酶的结合似乎涉及底物的3 ' -磷酸、腺嘌呤和泛酰基部分。丙烯酰辅酶a羧化酶不受丙烯酰辅酶a对氯脲苯甲酸盐的抑制,而ATP-MgCl2促进了这种抑制。
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Structural requirements for substrate binding to propionyl-CoA carboxylase

Further purification of propionyl-CoA carboxylase (EC 6.4.1.3) from bovine-liver mitochondria is reported. On the basis of the present and earlier investigations it is concluded that binding of acyl-CoA substrates by the carboxylase occurs through the CoA moiety. The relative maximum velocities of propionyl-CoA, propionyl-dephospho-CoA, and propionyl-pantetheine carboxylation were 1.0, 0.29, and 0.014, respectively; the Km values for the same substrates were 2.6·10−4, 2.8·10−3, and 2.4·10−2 M, respectively. Enzymatic carboxylation of propionyl-N-acetylcysteamine could not be demonstrated. Coenzyme A and 3′-AMP were found to inhibit the carboxylation reaction competitively with respect to propionyl-CoA, whereas, inhibition by 2′-AMP and 5′-AMP was of a mixed type. The binding of acyl-CoA substrate to the carboxylase appears to involve the 3′-phosphate, adenine, and pantoyl moieties of the subsrate. Propionyl-CoA carboxylase is protected from p-chloromercuribenzoate inhibition by propionyl-CoA, whereas, ATP-MgCl2 facilitates this inhibition.

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