Cited by 318Neutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stressProtein Kinase Regulation and GTPase Signaling

Molecular basis for Rac2 regulation of phagocyte NADPH oxidase

Diebold, Becky A., Bokoch, Gary M.·2001·Nature Immunology

Abstract

A Rac GTPase-regulated multiprotein NADPH oxidase is critical for the formation of reactive oxygen species (ROS) in phagocytic leukocytes and other nonphagocytic cells. NADPH oxidase reduces molecular oxygen to form superoxide anion in a two-step process. Electrons are initially transferred from NADPH to cytochrome b-associated FAD, then to cytochrome b heme and finally to molecular oxygen. We show here that Rac is required for both electron-transfer reactions. Mutational and biophysical analysis shows that Rac and p67phox independently regulate cytochrome b to catalyze the transfer of electrons from NADPH to FAD. However, they must interact with each other to induce the subsequent transfer of electrons from FAD to cytochrome b heme and molecular oxygen. This two-step model of regulation by Rac GTPase may provide a means of more effectively controlling the inflammatory responses of phagocytic leukocytes.

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Crossref · 10.1038/85259

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Authors
Diebold, B. A., & Bokoch, G. M.
Affiliations
Scripps Research Institute (US)
Corresponding author
Bokoch, Gary M.
Venue
Nature Immunology
Published
2001-03
Volume
2
Issue
3
Pages
211-215
ISSN
  • 1529-2908 (ISSN-L)
  • 1529-2916
OpenAlex
W1598564250
Cited by
318
References
35
Citations by year
2026: 5 · 2025: 6 · 2024: 4 · 2023: 18 · 2022: 9 · 2021: 13 · 2020: 5 · 2019: 4 · 2018: 8 · 2017: 5 · 2016: 11 · 2015: 8 · 2014: 11 · 2013: 15 · 2012: 10
FWCI
7.57
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL-48008, R01HL048008)
  • National Center for Research Resources (M01RR000833, M0-1RR00833)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
NADPH oxidase, phagocytes, reactive oxygen species, superoxide, cytochrome b, p67phox, electron transfer, FAD, superoxide dismutase, inflammation, GTPase regulation
MeSH terms
RAC2 GTP-Binding Protein, Animals, Cytochrome b Group, Electron Transport, Flavin-Adenine Dinucleotide, NADP, Phagocytes, Phosphoproteins, Mutagenesis, Site-Directed, Reactive Oxygen Species, Protein Structure, Tertiary, NADPH Oxidases, rac GTP-Binding Proteins

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