Cited by 76Protein Kinase Regulation and GTPase SignalingNeutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stress

Characterization of the Effector-specifying Domain of Rac Involved in NADPH Oxidase Activation

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Kwong, Cheung H., Adams, Anthony G., Leto, Thomas L.·1995·Journal of Biological Chemistry

Abstract

Production of microbicidal oxidants by phagocytic leukocytes requires activation of a latent NADPH oxidase by the coordinated assembly of a membrane-associated flavocytochrome b558, with three cytosolic components, p47phox, p67phox, and the low molecular weight GTP-binding protein Rac. Rac1 and Rac2 have 92% sequence identity and are both active in supporting the oxidase, while CDC42Hs, the closest relative to Rac with 70% sequence identity, only weakly supports oxidase activation in vitro. We have used CDC42Hs as a foil to identify residues in Rac that are critical for oxidase activation. Most of the divergent sequences of CDC42Hs could be incorporated into Rac-CDC42Hs chimeric proteins without affecting cell-free NADPH oxidase activity. However, incorporation of the amino-terminal segment of CDC42Hs (residues 1-40), which differs from Rac1 by only four residues (positions 3, 27, 30, and 33), resulted in a marked loss of oxidase activation capacity. Point mutagenesis studies showed that this was due to changes at residues 27 and 30, but not residues 3 and 33. Conversely, incorporation of the amino terminus of Rac1 (residues 1-40) into CDC42Hs increased its activity to that of Rac1, indicating that this terminus contains the effector-specifying domain of Rac. Taken together, these studies show that the difference in the activity between CDC42Hs and Rac1 is due entirely to differences in amino acids at position 27 and 30.

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Crossref · 10.1074/jbc.270.34.19868

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  • Previous structural and biochemical studies indicated that divergent amino acids at positions 27 and 30 in the switch 1 region of Rac are important for specific recognition and recruitment of its downstream effector p67phox.

    “Moreover, previous structural and biochemical studies indicated that divergent amino acids at positions 27 and 30 in the switch 1 region of Rac are important for specific recognition and recruitment of its downstream effector p67 phox , a component of the NADPH oxidase (49,50).”
  • p67phox is not a downstream effector of wildtype Cdc42, but Cdc42-to-Rac substitutions at positions 27 and 30 (K27A and S30G) in Cdc42 allow p67phox to serve as an effector of the resulting mutant Cdc42.

    “p67 phox is not a downstream effector of wildtype Cdc42, however, Cdc42-to-Rac substitutions at positions 27 and 30 (K27A and S30G) in Cdc42 allows p67 phox to serve as an effector of the resulting mutant Cdc42 (49,50).”

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Authors
Kwong, C. H., Adams, A. G., & Leto, T. L.
Affiliations
National Institutes of Health (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1995-08
Volume
270
Issue
34
Pages
19868-19872
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2038894510
Cited by
76
References
42
Citations by year
2026: 2 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 5 · 2020: 3 · 2019: 1 · 2014: 2
FWCI
1.49
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • 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
Keywords
Rac, NADPH oxidase activation, Cdc42, Rac1, Rac2, p47phox, p67phox, flavocytochrome b558, fusion protein, point mutagenesis, phagocytic leukocytes, G proteins
MeSH terms
Amino Acid Sequence, Animals, Binding Sites, Enzyme Activation, Humans, Molecular Sequence Data, Mutation, NADH, NADPH Oxidoreductases, Neutrophils, Oxidation-Reduction, Recombinant Fusion Proteins, Structure-Activity Relationship, Sequence Homology, Amino Acid, Cell Cycle Proteins, GTP-Binding Proteins, NADPH Oxidases, rac GTP-Binding Proteins, cdc42 GTP-Binding Protein, In Vitro Techniques

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