1887

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Volume 139, Issue 8

Molybdenum uptake in K12 Free

Abstract

SUMMARY: Molybdenum uptake was examined in K12 using the radionuclide Mo. The molybdenum uptake system was characterized in an unusual strain, which appeared to be normal in uptake of the MoO% ion but altered in subsequent molybdenum processing. As a consequence, molybdenum could be chased from cells in the strain, while it was irreversibly assimilated in the wild-type strain. Molybdenum uptake showed a biphasic kinetic curve, with a very rapid binding followed by a slow uptake phase. The uptake appeared to involve an active transport system. Molybdenum, probably in the form of molybdate, accumulated by a factor of about 30 in the cells. An energy source was necessary and uptake was inhibited by arsenate, but not by CCCP (carbonyl cyanide -chlorophenylhydrazone). The uptake system saturated with a K of 2·5·2·7 × 10 M. Uptake seemed to depend on a periplasmic binding protein, since cold shock treatment and arsenate abolished uptake. A molybdate binding protein activity was detected in the periplasmic fluid with a K of 9 nM. Sulphate inhibited uptake and the uptake activity was pH dependent, with an apparent p of 6·7. These results imply that molybdate transport belongs to the family of energy-dependent periplasmic binding protein systems. An explanation for the peculiar behaviour of the strain used in this work is proposed.

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  • Published Online:
© Society for General Microbiology, 1993
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1993-08-01
2024-04-26
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Molybdenum uptake in Escherichia coli K12
Microbiology 139, 1869 (1993); https://doi.org/10.1099/00221287-139-8-1869
/content/journal/micro/10.1099/00221287-139-8-1869
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