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. 1988 May;170(5):2301–2305. doi: 10.1128/jb.170.5.2301-2305.1988

Metabolism of adenylylated nucleotides in Clostridium acetobutylicum.

I A Balodimos 1, E R Kashket 1, E Rapaport 1
PMCID: PMC211122  PMID: 3360745

Abstract

In response to the stresses imposed by temperature upshift or addition of butanol, Clostridium acetobutylicum cultures accumulated diadenosine-5',5'''-P1,P4-tetraphosphate (Ap4A) and adenosine 5'-P1,P4-tetraphospho-5'-guanosine (Ap4G) to high levels. The two adenylylated nucleotides were also accumulated in batch culture in the absence of imposed stresses when the clostridia switched from the acidogenic phase of growth to the solventogenic phase. Most of the adenylylated nucleotides were extracellular. The intracellular concentrations of these compounds were low throughout batch growth and in cells stressed by added butanol. In contrast to other procaryotes, these clostridia did not possess enzymes to degrade the dinucleotides, as shown with both intact cells and cell-free preparations. Our findings are consistent with the hypothesis that endogenously produced solvents are stressful to the cells, stimulating the synthesis of adenylylated nucleotides. The nucleotides accumulate extracellularly because they cannot be degraded and because the cell membranes are permeabilized by the solvents produced.

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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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