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Multiple SH3 domain interactions regulate NADPH oxidase assembly in whole cells
I de Mendez1, A G Adams, R A Sokolic
1Laboratory of Host Defenses, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20892, USA.
The EMBO Journal
|March 15, 1996
Summary
Src homology 3 (SH3) domains are key for NADPH oxidase assembly. p47phox utilizes its SH3 domains to mediate interactions, enabling the formation of an active microbicidal oxidase crucial for phagocyte function.
Area of Science:
- Cellular Biology
- Immunology
- Biochemistry
Background:
- Src homology 3 (SH3) domains mediate critical protein-protein interactions for signal transduction and localization.
- The NADPH oxidase complex, involving p47phox and p67phox, is essential for microbicidal activity in phagocytes.
Purpose of the Study:
- To elucidate the role of SH3 domains in the assembly of the NADPH oxidase complex.
- To identify specific SH3-mediated interactions between p47phox, p67phox, and flavocytochrome b558.
Main Methods:
- Deletion analysis of p47phox and p67phox in transfected K562 cells.
- Investigated protein-protein interactions using functional assays in whole cells.
Main Results:
- Multiple SH3-mediated interactions were identified between p47phox, p67phox, and flavocytochrome b558.
- The core region of p47phox (residues 151-284) containing SH3 domains is essential for flavocytochrome-dependent translocation and oxidase activity.
- p67phox translocation is mediated by interactions with p47phox SH3 domains and involves its N-terminal domain (residues 1-246) and C-termini.
Conclusions:
- p47phox plays a central regulatory role in NADPH oxidase assembly through multiple SH3 domain interactions.
- SH3 domain interactions are crucial for the recruitment and activation of the NADPH oxidase complex during phagocyte stimulation.