Further evidence for the involvement of a monocyclic β-lactam in the enzymatic conversion of δ-L-α-aminoadipoyl-L-cysteinyl-D-valine into isopenicillin N.
作者:J.E. Baldwin、M. Bradley、R.M. Adlington、W.J. Norris、N.J. Turner
DOI:10.1016/s0040-4020(01)90503-4
日期:1991.1
Incubation of δ--α-aminoadipoyl--[3-13Ccysteinyl--[3-2H]valine with Isopenicillin N Synthase (IPNS) resulted in the observation of a ‘shunt metabolite’, which we believe is formed from the collapse of an enzyme bound monocyclic β-lactam intermediate. Chemical studies into the origin of the shunt metabolite suggest its formation occurred after initial β-lactam ring closure. Further chemical studies
δ -- α-氨基己二酰基-[3- 13C半胱氨酰-[3- 2 H]缬氨酸与异戊西林N合酶(IPNS)的孵育导致观察到“分流代谢产物”,我们认为它是由塌陷形成的酶结合的单环β-内酰胺中间体。对分流代谢产物起源的化学研究表明,其形成是在最初的β-内酰胺环闭合后发生的。对游离硫醇单环β-内酰胺分解途径的进一步化学研究表明,它不是分路代谢产物的来源,因为分解后形成的主要产物以烯硫醇脱氢半胱氨酸的形式保留了硫。