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. 1976 Oct;128(1):99–104. doi: 10.1128/jb.128.1.99-104.1976

Transport of vitamin B12 in Escherichia coli: energy dependence.

C Bradbeer, M L Woodrow
PMCID: PMC232830  PMID: 135757

Abstract

This paper presents some evidence that the osmotic shock-sensitive, energy-dependent transfer of vitamin B12 from outer membrane receptor sites into the interior of cells of Escherichia coli requires an energized inner membrane, without obligatory intermediation of adenosine 5'-triphosphate (ATP). The experiments measured the effects of glucose, D-lactate, anaerobiosis, arsenate, cyanide, and 2,4-dinitrophenol upon the rates of B12 transport by starved cells of E. coli KBT001, which possesses a functional Ca2+, Mg2+-stimulated adenosine triphosphatase (Ca,MgATPase), and of E. coli AN120, which lacks this enzyme. Both strains were able to utilize glucose and D-lactate aerobically to potentiate B12 transport, indicating that the Ca,MgATPase was not essential for this process. When respiratory electron transport was blocked, either by cyanide or by anaerobic conditions, and the primary source of energy for the cells was presumably ATP from glucose fermentation, the rate of B12 transport was much reduced in E. coli AN120 but not in E.coli KBT001. These results support the view that the CaMgATPase can play a role in B12 transport but only when the energy for this process must be derived from ATP. The results of experiments with arsenate also supported the conclusion that the generation of phosphate bond energy was not absolutely required for B12 transport.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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