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. 1992 Jul 15;285(Pt 2):635–639. doi: 10.1042/bj2850635

Involvement of GTP in cell-free activation of neutrophil NADPH oxidase. Studies with GTP analogues.

E Klinger 1, I Aviram 1
PMCID: PMC1132836  PMID: 1637353

Abstract

Activation of superoxide-producing NADPH oxidase of neutrophils requires the presence of cell membranes, cytosolic components and arachidonate and is markedly enhanced by non-hydrolysable analogues of guanine nucleotides, i.e. guanosine 5'-[gamma-thio]triphosphate and guanosine 5'[beta gamma-imido]triphosphate (p[NH]ppG). Gel filtration and ultrafiltration of the cytosol decreased the basal activity of NADPH oxidase. Activity could be restored by GTP, suggesting participation of the nucleotide in basal activation. Preincubation of neutrophil cytosol with periodate-oxidized p[NH]ppG (ox-p[NH]ppG) followed by gel filtration resulted in a time-dependent enhancement of basal oxidase activity. The presence of GDP or GTP, but not ATP, during the incubation with ox-p[NH]ppG abolished this enhancement. These data are consistent with a stable association of ox-p[NH]ppG with an oxidase-linked cytosolic protein. SDS/PAGE of neutrophil cytosol preincubated with [3H]ox-p[NH]ppG revealed radioactivity in bands migrating as 100, 70, 47, 34 and 22 kDa proteins. Evidence for covalent labelling of the cytosolic protein p47-phox with [3H]ox-p[NH]ppG is presented. Heterogeneity of cytosolic GTP-binding sites and possible participation of protein p47-phox in functional interaction with GTP analogues during cell-free activation are suggested.

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Selected References

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