Proline Transport and Osmotic Stress Response in Escherichia Coli K-12

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1986 Apr 1

PMID 3514577

Citations 54

Authors

S Grothe

R L Krogsrud

D J McClellan

J L Milner

J M Wood

Affiliations

Soon will be listed here.

Abstract

Proline is accumulated in Escherichia coli via two active transport systems, proline porter I (PPI) and PPII. In our experiments, PPI was insensitive to catabolite repression and was reduced in activity twofold when bacteria were subjected to amino acid-limited growth. PPII, which has a lower affinity for proline than PPI, was induced by tryptophan-limited growth. PPII activity was elevated in bacteria that were subjected to osmotic stress during growth or the transport measurement. Neither PPI nor uptake of serine or glutamine was affected by osmotic stress. Mutation proU205, which was similar in genetic map location and phenotype to other proU mutations isolated in E. coli and Salmonella typhimurium, influenced the sensitivity of the bacteria to the toxic proline analogs azetidine-2-carboxylate and 3,4-dehydroproline, the proline requirements of auxotrophs, and the osmoprotective effect of proline. This mutation did not influence proline uptake via PPI or PPII. A very low uptake activity (6% of the PPII activity) observed in osmotically stressed bacteria lacking PPI and PPII was not observed when the proU205 lesion was introduced.

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