Effects of (+)-catechin in vitro and in vivo on disturbances produced in rat liver endoplasmic reticulum by carbon tetrachloride [proceedings].

phosphate, and the possibility that the reaction may also be limited by the stability of other factors, explains the incompleteness of the transcarbamoylation. In conclusion, these results are consistent with the presence in S. clavuligerus of an enzyme which transfers a carbamoyl group from the carbamoyl phosphate to the 3-hydroxymethyl group on the cephalosporin nucleus. This enzyme should be called an 0-carbamoyltransferase. We know of no previous description of such an enzyme.