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. 1992 Mar 15;89(6):2494–2498. doi: 10.1073/pnas.89.6.2494

Absolute requirement for GTP in activation of human neutrophil NADPH oxidase in a cell-free system: role of ATP in regenerating GTP.

P Peveri 1, P G Heyworth 1, J T Curnutte 1
PMCID: PMC48685  PMID: 1312725

Abstract

Guanine and/or adenine nucleotides appear to be involved in the activation of the superoxide-generating NADPH oxidase of phagocytic cells. Their precise roles, however, are unclear, as much of the evidence for their involvement comes from experiments in which nucleotides have been added to complex systems already rich in both endogenous nucleotides and enzymes capable of interconverting them. To circumvent this problem we have examined the role of nucleotides in neutrophil NADPH oxidase activation by using a cell-free system in which adenine and guanine nucleotide concentrations were carefully controlled and monitored by (i) depletion of endogenous nucleotides by extensive dialysis and charcoal treatment; (ii) reconstitution of the depleted system with reagents analyzed for purity; and (iii) measurement of nucleotide levels in cytosol preparations and in oxidase reaction mixtures by HPLC analysis. In contrast to previous reports that have demonstrated only a several-fold enhancement of oxidase activity by GTP or its analogs, we have shown that oxidase activation was absolutely dependent upon GTP in reactions containing dialyzed cytosol in which the total endogenous nucleotide levels were reduced by greater than 99.5%. Kinetic studies revealed that GTP is required at or before the rate-limiting step in oxidase activation. Two nonhydrolyzable analogs of GTP, guanosine 5'-(gamma-thio)triphosphate and guanylyl imidodiphosphate, were even more active than GTP, suggesting the involvement of one or more GTP-binding proteins. In contrast, ATP was neither necessary nor sufficient for oxidase activation. If reaction mixtures were contaminated with GDP and/or GMP, however, ATP (but not its nonhydrolyzable analog adenylyl imidodiphosphate) could indirectly support oxidase activation by means of endogenous enzymes that catalyze the ATP-dependent conversion of GMP and GDP to GTP.

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Selected References

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