大肠杆菌棉子糖操纵子

Raffinose Operon of Escherichia coli

大肠杆菌 (Escherichiacoli)棉子糖 (raf)操纵子位于质粒 ,它编码能够使大肠杆菌吸收和利用三糖棉子糖的蛋白 ,即一个主动运输系统 (Raf透性酶 ) ,α 半乳糖苷酶和蔗糖水解酶。raf操纵子包括启动子rafP ,调节基因rafR ,操纵基因rafO以及rafA ,rafB ,rafD三个结构基因。这个操纵子由一个阻遏蛋白RafR负控制 ,同时以环腺苷 代谢降解物基因激活蛋白 (cAMP CAP)为中介的正调控也参与调节。

The plasmid\|borne raf operon encodes functions required for inducible uptake and utilization of raffinose by Escherichia coli.Raf functions include active transport (Raf permease),α\|galactosidase,and sucrose hydrolase,which are negatively controlled by the Raf repressor,and positively controlled by the cAMP\|binding protein,CAP.\;