A procedure is described for isolation of essentially pure deaminase from Euglena gracilis. Experiments with this enzyme prove (a) that it assembles four intact units of porphobilinogen; (b) the intermediate mono-, di-, tri-, and tetra-pyrroles are covalently bound to deaminase before release as the hydroxymethylbilane; (c) this bilane is built starting with ring-A and ending with ring-D and each of
描述了一种从裸藻(Euglena gracilis)分离基本上纯的脱
氨酶的方法。用这种酶进行的实验证明(a)它组装了四个完整的胆色素原。(b)中间体一
吡咯,二
吡咯,三
吡咯和四
吡咯在脱
氨酶上共价结合,然后以羟甲基胆烷的形式释放;(c)从第A环开始到第D环结束制造该胆烷,并以相同的速率将四环胆色素原中的每一个
胆碱菌素建成;(d)形成了非常活泼的四
吡咯中间体(比羟甲基胆烷的反应活性更高),并且通过诱捕实验提供的证据表明该反应物种是线性四
吡咯氮杂富烯(6)。