The Osmotically Regulated Locus of Encodes a Periplasmic Betaine-binding Protein Free

Abstract

The locus of encodes an osmotically induced betaine transport system. We have identified a 31 kDa periplasmic protein, encoded by , whose synthesis is induced by osmotic stress. A specific betaine-binding activity with a of about 1 m is also present in the periplasm of osmotically induced cells. This activity is absent in those mutants which lack the 31 kDa periplasmic protein. Thus, ProU is a periplasmic binding-protein-dependent transport system.

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1987-02-01
2024-03-29
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