synthetic ring fission intermediates were used to investigate the enzymatic reaction catalysed by C-C hydrolase BphD from Pseudomonas LB400. A reduced substrate analogue 2,6-dihydroxy-6-phenylhexa-2,4-dienoic acid was processed enzymatically to benzaldehyde by C-C hydrolase BphD, consistent with a catalytic mechanism involving general base-catalysed attack of water to give a gem-diol intermediate, and not
使用Heck偶联策略,已建立了细菌羟基裂解途径上的2-羟基-6-酮己二-2,4-二烯酸中间体的
化学合成方法。3-溴-2-乙酰氧基
丙烯酸乙酯与1-芳基
乙烯基缩酮或1-芳基烯丙基醇的偶联以70-90%的收率进行。与烷基
乙烯基缩酮的Heck偶联也是成功的,从而允许合成烷基取代的环裂变中间体。合成的环裂变中间体用于研究假单胞菌LB400的CC
水解酶BphD催化的酶促反应。通过CC
水解酶BphD将还原的底物类似物2,6-二羟基-6-苯基六-2,4-二烯酸酶解为
苯甲醛,这与涉及一般碱催化的
水攻击产生宝石
-二醇中间体的催化机理相一致。 ,且与亲核机制不一致。针对BphD测定了一系列对位取代的2-羟基-6-酮-6-苯基六-2,4-二烯酸底物,推导的Hammett图(rho = -0.71)与过渡中离去的碳负离子一致CC裂解状态。