作者:Yadu B. Tewari,、Andrew M. Davis,、Prasad Reddy,、Robert N. Goldberg
DOI:10.1006/jcht.2000.0677
日期:2000.8
performance liquid chromatography were used to conduct a thermodynamic investigation of the biochemical reaction chorismate(aq) = isochorismate(aq). This reaction occurs at the branch point of the chorismate metabolic pathway that leads to the synthesis of enterobactin. Isochorismate synthase, the enzyme that catalyzes this reaction, was prepared for this study by using molecular biology techniques. The equilibrium
摘要 采用微量热法和高效液相色谱法对分支酸(aq) = 异分支酸(aq) 的生化反应进行了热力学研究。该反应发生在导致肠杆菌素合成的分支酸代谢途径的分支点。异分支酸合酶,即催化该反应的酶,是通过使用分子生物学技术为本研究制备的。平衡和量热测量在 T = 298.15 K 和各自的 pH 值 7.34 和 6.93 下进行。对于化学参考反应分支酸2 - (aq) = 异分支酸2 - (aq),平衡常数K = (0.84 ± 0.04) 和标准摩尔反应焓ΔrHmo = - (0.81 ± 0.27)kJ · mol - 1atT = 298.15 K 和离子强度 Im = 0。在近似生理条件下,