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Autoregulation of the rho gene of Escherichia coli K-12

✍ Scribed by Kung, Hsiang-fu ;Bekesi, Eva ;Guterman, Sonia K. ;Gray, John E. ;Traub, Lisa ;Calhoun, David H.

Publisher: Springer
Year: 1984
Tongue: English
Weight: 407 KB
Volume: 193
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00330669

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✦ Synopsis

It has previously been proposed, based on indirect evidence, that the Rho protein may control the expression of the rho gene. Using an in vitro system for the transcription and translation of the rho gene cloned into plasmid pBR322, we tested this hypothesis directly by monitoring the effect in vitro of excess or limiting Rho protein. The addition of purified Rho protein suppresses Rho synthesis in vitro. The addition of antibody to Rho specifically stimulates Rho synthesis in vitro. The stimulation of Rho factor synthesis by antibody to Rho is reversed by Rho protein. Rho factor purified from a strain with a mutationally altered rho gene (rho-115) does not suppress Rho synthesis in vitro. These results provide convincing evidence that the rho gene is subject to autoregulation.

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