The NADPH oxidase of neutrophils and other bone-marrow-derived phagocytic cells is a multi-component system consisting of a flavocytochrome b in the plasma membrane and at least four cytosolic proteins. Three of the cytosolic proteins contain src homology 3 (SH3) domains, two each in p47phox and p67phox, and one in p40phox. All three translocate from the cytosol to the flavocytochrome in the membrane upon stimulation of the cells. A small G-protein, p21rac, is also involved in activation of the oxidase. The three cytosolic phox proteins occur as a complex in the cytosol and the strongest interaction appeared to be between p67phox and p40phox. We have investigated the interaction between p40phox and the other two cytosolic phox proteins by in vitro binding assays. An affinity-bead approach was used as well as a biosensor technique (surface plasmon resonance). We observed the strongest attachment between p40phox and p67phox where the binding was between the N-terminal half of p67phox and the C-terminal half of p40phox, and did not appear to involve SH3 domains and proline-rich sequences. p40phox also bound p47phox but more weakly than it did p67phox.
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Research Article|
August 01 1996
Interactions between cytosolic components of the NADPH oxidase: p40phox interacts with both p67phox and p47phox
Frans B. WIENTJES;
Frans B. WIENTJES
‡
*Department of Medicine, University College London, 5 University Street, London WC1E 6JJ
‡To whom correspondence should be addressed.
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George PANAYOTOU;
George PANAYOTOU
†Ludwig Institute for Cancer Research, 91 Riding House Street, London, U.K.
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Emer REEVES;
Emer REEVES
*Department of Medicine, University College London, 5 University Street, London WC1E 6JJ
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Anthony W. SEGAL
Anthony W. SEGAL
*Department of Medicine, University College London, 5 University Street, London WC1E 6JJ
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Publisher: Portland Press Ltd
Received:
January 25 1996
Revision Received:
April 02 1996
Accepted:
April 18 1996
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London © 1996
1996
Biochem J (1996) 317 (3): 919–924.
Article history
Received:
January 25 1996
Revision Received:
April 02 1996
Accepted:
April 18 1996
Citation
Frans B. WIENTJES, George PANAYOTOU, Emer REEVES, Anthony W. SEGAL; Interactions between cytosolic components of the NADPH oxidase: p40phox interacts with both p67phox and p47phox. Biochem J 1 August 1996; 317 (3): 919–924. doi: https://doi.org/10.1042/bj3170919
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