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ToxR-Independent Expression of Cholera Toxin from the Replicative Form of CTXφ

机译:CTXφ复制形式的霍乱毒素的ToxR独立表达

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The ctxAB operon, which encodes cholera toxin, resides in the genome of CTXφ, a filamentous bacteriophage. WithinVibrio cholerae cells, the CTXφ genome can exist either as a replicating plasmid or as a prophage integrated into the chromosome. Previous work established that ToxR is required for chromosomal ctxAB expression. We have learned that strains harboring the CTXφ replicative form produce cholera toxin under all conditions tested, independently of ToxR. During passage of CTXφ lysogens through the infant mouse intestine, transduction of CTXφ to a recipient strain can be detected, indicating that phage excision and replication occur in vivo. These results suggest that phage induction might provide a novel mechanism for the regulation of cholera toxin production.
机译:编码霍乱毒素的 ctxAB 操纵子位于丝状噬菌体CTXφ的基因组中。在霍乱弧菌细胞中,CTXφ基因组可以作为复制质粒存在,也可以作为整合到染色体中的原噬菌体存在。先前的工作确定了ToxR是染色体 ctxAB 表达所必需的。我们已经知道,带有CTXφ复制形式的菌株在所有测试条件下均会产生霍乱毒素,而与ToxR无关。在CTXφ溶原原通过婴儿小鼠肠道的过程中,可以检测到CTXφ向受体菌株的转导,表明在体内发生了噬菌体切除和复制。这些结果表明噬菌体诱导可能提供了一种新的机制来调节霍乱毒素的生产。

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