Intact incorporation of δ-(α-<scp>L</scp>-aminoadipoyl)-<scp>L</scp>-[3-<sup>13</sup>C]cysteinyl-<scp>D</scp>-[<sup>15</sup>N]valine into isopenicillin N. Observation of one-bond<sup>13</sup>C–<sup>15</sup>N coupling
作者:Robert L. Baxter、Christopher J. McGregor、Gordon A. Thomson、A. Ian Scott
DOI:10.1039/p19850000369
日期:——
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.
Incubation of δ--α-aminoadipoyl--[3-13Ccysteinyl--[3-2H]valine with IsopenicillinNSynthase (IPNS) resulted in the observation of a ‘shuntmetabolite’, which we believe is formed from the collapse of an enzyme bound monocyclic β-lactam intermediate. Chemical studies into the origin of the shuntmetabolite suggest its formation occurred after initial β-lactam ring closure. Further chemical studies