Phosphate transport in arsenate-resistant mutants of Micrococcus lysodeikticus

Author:

Alfasi H,Friedberg D,Froedberg I

Abstract

Two types of arsenate-resistant mutants of Micrococcus lysodeikticus were found: (i) mutants that grow in the presence of 10 mM but not 1 mM phosphate (Pi) with low uptake rate for Pi and arsenate, and (ii) mutants able to grow in the presence of 10 mM and 1 mM Pi, with a near-normal uptake rate for Pi but a low one for arsenate. The Km values for Pi transport and the Ki values for its competitive inhibition by arsenate were similar for the mutants and the wild type. Similar to the wild type, the mutants also accumulated Pi to high concentrations. In all strains, the transport of Pi was subject to repression by Pi. Mutant types showed lower Vmax but unaltered Km values for arsenate as compared to the wild type, and they accumulated arsenate to markedly lower levels. The results suggest a two-component transport system common to Pi and arsenate.

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

Reference17 articles.

1. Arsenate resistant mutants of Escherichia coli and phosphate transport;Bennett R. L;Biochem. Biophys. Res. Commun.,1970

2. Phosphate transport in Micrococcus lysodeikticus;Friedberg I.;Biochim. Biophys. Acta,1977

3. The effect of ionophores on phosphate and arsenate transport in Micrococcus Iysodeikticus;Friedberg I.;FEBS Lett.,1977

4. Structures containing polyphosphate in Micrcoccus Iysodeikticus;Friedberg I.;J. Bacteriol.,1968

5. Fine structure of polyphosphate granules in Micrococcus Iysodeikticus. lar;Friedberg I.;J. Med. Sci.,1970

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