Synthesis of an R Plasmid Protein Associated with Tetracycline Resistance is Negatively Regulated

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1976 May 1

PMID 775491

Citations 49

Authors

H L Yang

G Zubay

S B Levy

Affiliations

Soon will be listed here.

Abstract

Synthesis of proteins encoded by the R222 plasmid was observed in a DNA-directed cell-free system and the products were compared to those plasmid proteins synthesized in Escherichia coli minicells. A greater number of plasmid-specified proteins was detected in the in vitro system than in the minicell, suggesting the presence of control factors for plasmid gene expression in the minicell. Synthesis of a newly detected plasmid protein (TET protein) is induced by tetracycline in minicells containing tetracycline-resistant plasmids, including R222, and this induced synthesis correlates with induced host resistance to the drug. This TET protein was synthesized in vitro from R222 DNA in the absence of tetracycline, indicating that no positive regulatory role for tetracycline is required for the protein's synthesis. TET proteon synthesis was inhibited in vitro when cell-free extracts prepared from cells containing the R222 plasmid were used.

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