Kinetic and thermodynamic characterization of adenylyl cyclase from Euglena gracilis.

Kinetic and thermodynamic characterization of adenylyl cyclase from Euglena gracilis.
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纤细眼虫腺苷酸环化酶的动力学和热力学特征。

DOI:
10.1016/s0003-9861(02)00235-7
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发表时间:
2002
影响因子:
3.9
通讯作者:
M. Eugenia Torres
M. Eugenia Torres
中科院分区:
生物学3区
文献类型:
--
作者:
R. Jasso‐Chávez;A. Vega;M. El;R. Moreno;M. Eugenia Torres

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研究了纤细裸藻质膜腺苷酸环化酶(AC)的动力学和热力学性质。Mg-ATP的AC动力学为双曲线型,Km值为0.33-0.43mM,而2′,5 ′-二脱氧腺苷的AC动力学为混合型,Ki值为80-147μM。Vm值(0.9或1.8nmol(mg蛋白质)-1min-1)的变化取决于生长培养基中的碳源(乳酸或谷氨酸加苹果酸)。乳酸膜AC的热不稳定性略高(28 - 40°C),活化能较高(15-25°C)。在乳酸的情况下,质膜中总脂肪酸和饱和脂肪酸的百分比含量显著高于谷氨酸加苹果酸,而多不饱和(n−3)脂肪酸的百分比含量较低。这些数据表明,脂肪酸组成,改变了碳源在生长培养基中,可以调节在裸藻AC活性。
Some kinetic and thermodynamic properties of the plasma membrane adenylyl cyclase (AC) from the protist Euglena gracilis were examined. The AC kinetics for Mg-ATP was hyperbolic with a Kmvalue of 0.33–0.43mM, whereas the inhibition exerted by 2′,5′-dideoxyadenosine was of the mixed type with a Kiof 80–147μM. The Vmvalue (0.9 or 1.8nmol(mg protein)−1min−1) changed, depending upon the carbon source in the growth medium (lactic acid or glutamate plus malate). Lactic acid membrane AC was slightly more thermolabile (from 28 to 40°C) and showed higher activation energy (range 15–25°C). With lactate, the total and saturated fatty acid percentage content in the plasma membrane was significantly greater than with glutamate plus malate, whereas the percentage content of polyunsaturated (n−3) fatty acids was lower. The data suggest that the fatty acid composition, as changed by the carbon source in the growth medium, may modulate the AC activity in Euglena.
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发表时间: 2000-11
期刊: Biochemistry
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DOI: --
发表时间: 1990
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