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. 1982 Mar;149(3):808–815. doi: 10.1128/jb.149.3.808-815.1982

Role of membrane-bound 5'-nucleotidase in nucleotide uptake by the moderate halophile Vibrio costicola.

C Bengis-Garber, D J Kushner
PMCID: PMC216466  PMID: 6277854

Abstract

Intact cells of Vibrio costicola hydrolyzed ATP, ADP, and AMP. The membrane-bound 5'-nucleotidase (C. Bengis-Garber and D. J. Kushner, J. Bacteriol. 146:24-32, 1981) was solely responsible for these activities, as shown by experiments with anti-5'-nucleotidase serum and with the ATP analog, adenosine 5'-(beta gamma-imido)-diphosphate. Fresh cell suspensions rapidly accumulated 8-14C-labeled adenine 5'-nucleotides and adenosine. The uptake of ATP, ADP, and AMP (but not the adenosine uptake) was inhibited by adenosine 5'-(beta gamma-imido)-diphosphate similarly to the inhibition of the 5'-nucleotidase. Furthermore, the uptake of nucleotides had Mg2+ requirements similar to those of the 5'-nucleotidase. The uptake of ATP was competitively inhibited by unlabeled adenosine and vice versa; inhibition of the adenosine uptake by ATP occurred only in the presence of Mg2+. These experiments indicated that nucleotides were dephosphorylated to adenosine before uptake. The hydrolysis of [alpha-32P]ATP as well as the uptake of free adenosine followed Michaelis-Menten kinetics. The kinetics of uptake of ATP, ADP, and AMP also each appeared to be a saturable carrier-mediated transport. The kinetic properties of the uptake of ATP were compared with those of the ATP hydrolysis and the uptake of adenosine. It was concluded that the adenosine moiety of ATP was taken up via a specific adenosine transport system after dephosphorylation by the 5'-nucleotidase.

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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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