p47phox, the phagocyte NADPH oxidase/NOX2 organizer: structure, phosphorylation and implication in diseases.
10.3858/emm.2009.41.4.058
- Author:
Jamel EL-BENNA
1
,
2
;
Pham My Chan DANG
;
Marie Anne GOUGEROT-POCIDALO
;
Jean Claude MARIE
;
Francoise BRAUT-BOUCHER
Author Information
1. INSERM, U773, CRB3
2. Universite Paris 7 Denis Diderot Faculte de Medecine, site Bichat Paris, F-75018, France. jamel.elbenna@inserm.fr
- Publication Type:Review ; Research Support, Non-U.S. Gov't
- Keywords:
CYBB protein, human;
NADPH oxidase;
neutrophil cytosolic factor 1;
neutrophils;
phosphorylation;
reactive oxygen species;
review
- MeSH:
*Disease;
Enzyme Activation;
Humans;
Membrane Glycoproteins/chemistry/*metabolism;
NADPH Oxidase/chemistry/genetics/*metabolism;
Phagocytes/cytology/*metabolism;
Phosphorylation;
Protein Conformation
- From:Experimental & Molecular Medicine
2009;41(4):217-225
- CountryRepublic of Korea
- Language:English
-
Abstract:
Phagocytes such as neutrophils play a vital role in host defense against microbial pathogens. The anti-microbial function of neutrophils is based on the production of superoxide anion (O2(.-)), which generates other microbicidal reactive oxygen species (ROS) and release of antimicrobial peptides and proteins. The enzyme responsible for O2(.-) production is called the NADPH oxidase or respiratory burst oxidase. This multicomponent enzyme system is composed of two transmembrane proteins (p22phox and gp91phox, also called NOX2, which together form the cytochrome b(558)) and four cytosolic proteins (p47phox, p67phox, p40phox and a GTPase Rac1 or Rac2), which assemble at membrane sites upon cell activation. NADPH oxidase activation in phagocytes can be induced by a large number of soluble and particulate agents. This process is dependent on the phosphorylation of the cytosolic protein p47phox. p47phox is a 390 amino acids protein with several functional domains: one phox homology (PX) domain, two src homology 3 (SH3) domains, an auto-inhibitory region (AIR), a proline rich domain (PRR) and has several phosphorylated sites located between Ser303 and Ser379. In this review, we will describe the structure of p47phox, its phosphorylation and discuss how these events regulate NADPH oxidase activation.
