Feedback Regulation of Ribosomal Protein Gene Expression in Escherichia Coli

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1980 Jun 1

PMID 6251471

Citations 44

Authors

D Dean

M Nomura

Affiliations

Soon will be listed here.

Abstract

The structural genes for Escherichia coli ribosomal protein (r-protein) genes L1, S4, and S11 were inserted into a plasmid vector containing the lac operator and promoter such that the synthesis of L1, S4, and S11 was controlled by lac regulatory elements. Synthesis of L1, S4, and S11 was stimulated by addition of an inducer of the lac operon (isopropyl thiogalactoside) to exponentially growing cells. Elevated synthesis of L1 caused a specific decrease in L11 synthesis, whereas overproduction of S4 resulted in lowered synthesis of S13 and L17. Stimulation of L1 or S4 synthesis also inhibited cell growth. Overproduction of S11 did not affect synthesis of other r-proteins or alter growth. These results confirm previous in vitro studies [Yates, J. L., Arfsten, A. E. & Nomura, M. (1980) Proc. Natl. Acad. Sci. USA 77, 1837-1841] and support the hypothesis that certain r-proteins have the capacity to selectively inhibit synthesis of r-proteins whose genes are in the same operon as their own.

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