NITRATE ASSIMILATION OF AMYCOLATOPSIS MEDITERRANEl U-32 AND SOME PROPERTIES OF ITS NITRATE REDUCTASE
地中海拟无枝菌酸菌U-32对硝酸盐的同化及其硝酸还原酶特性

Preliminary results indicate that NR of Amycolatopsis mediterranei U-32, like that of plants and fungi, is also an inducible enzyme. Its synthesis is induced by nitrate and repressed by ammonia and other readily usable nitrogen sources. Chloramphenicol inhibitory experiment shows that NR induction involves de novo synthesis of proteins. Competition between molybdate and tungstate in NR synthesis suggested that NR of A. mediterranei U-32 is a molybdenumcontaining enzyme. NR activity in crude extract is inhibited by KCN and NADH. The natural electron donor of NR is still unknown. Beside, NR of A. mediterranei U-32 does correlation between rifamycin SV productivity to specific activity of mycelial nitrate reductase.