动植物中的血红素降解
Haem degradation in animals and plants.
作者信息
Mantle T J
机构信息
Department of Biochemistry, Trinity College, Dublin 2, Ireland.
出版信息
Biochem Soc Trans. 2002 Aug;30(4):630-3. doi: 10.1042/bst0300630.
Two enzyme systems have evolved for the reduction of linear tetrapyrroles: one family, found in plants, algae and cyanobacteria, uses ferredoxin and catalyses the reduction of the terminal pyrrole rings (A and D) and one of the vinyl side chains to form various light-harvesting and light-sensing chromophores. The other group (biliverdin reductases A and B) utilize NAD(P)H and catalyse reduction at C10 (hydride addition) to form the 'bile' pigments bilirubin-IX alpha and bilirubin-IX.
为还原线性四吡咯，已进化出两种酶系统：一种存在于植物、藻类和蓝细菌中，利用铁氧化还原蛋白，催化末端吡咯环（A环和D环）以及一个乙烯基侧链的还原，以形成各种光捕获和光传感发色团。另一组（胆绿素还原酶A和B）利用NAD(P)H并催化C10位的还原（氢化物加成），以形成“胆汁”色素胆红素-IXα和胆红素-IX。
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