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PMID: 7068540 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S.

Cadmium and manganese transport in Staphylococcus aureus membrane vesicles.

Journal of bacteriology ·Vol. 150 ·No. 2 ·1982-05-00 ·Pages 973-6

Perry RD, Silver S

Abstract

The presence of plasmid gene cadB did not affect Cd2+ accumulation, whereas plasmid gene cadA reduced Cd2+ accumulation by whole cells but not by membrane vesicles. Membrane vesicle studies indicated that Cd2+ uptake occurred via the Mn2+ transport system which was energized by the membrane electrical potential. Mn2+ and Cd2+ were competitive inhibitors of each other's transport, with Km's of 0.95 microM Mn2+ and 0.2 microM Cd2+. The kinetic parameters were nearly identical with vesicles prepared from sensitive and resistant cells, indicating that the cadA-encoded Cd2+ efflux system was inoperative in membrane vesicle preparations. Experiments with energy-inhibited cells indicated that the cadB gene product may bind Cd2+.

MeSH Terms
Biological Transport, Active Cadmium/metabolism,pharmacology Cell Fractionation Cell Membrane/metabolism Kinetics Manganese/metabolism R Factors Staphylococcus aureus/drug effects,metabolism
Chemicals
Cadmium Manganese
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Perry R D
Silver S
References (19)
19 references, click to expand
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Article Info
Journal
Journal of bacteriology
Abbr.
J Bacteriol
ISSN
0021-9193
Published
1982-05-00
Pages
973-6
Language
English
Region
United States
NLM ID
2985120R
PMCID
PMC216454
Subset
IM
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