Cited by 79Neutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stressNitric Oxide and Endothelin Effects

Purification and characterization of a third cytosolic component of the superoxide-generating NADPH oxidase of macrophages

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Abo, A., Pick, E.·1991·Journal of Biological Chemistry

Abstract

Activation of the superoxide (O2-)-generating NADPH oxidase of phagocytes in a cell-free system by anionic amphiphiles requires the participation of both membrane and cytosolic components. We reported that ammonium sulfate fractionation (Pick, E., Kroizman, T., and Abo, A. (1989) J. Immunol. 143, 4180-4187) and affinity chromatography on 2',5'-ADP-agarose (Shaag, D., and Pick, E. (1990) Biochim. Biophys. Acta 1037, 405-412) permit separation of cytosol in two fractions (sigma 1 and sigma 2) that support O2- production by solubilized membrane synergistically. We now describe the purification of sigma 1 to near homogeneity and demonstrate that it represents a cytosolic component distinct from p47-phox and p67-phox, that are both found in fraction sigma 2. Sigma 1 was absolutely required for the full expression of amphiphile-activated NADPH-oxidase activity. This requirement was evident whether sigma 1 was added to cell-free systems composed of: (a) solubilized membrane and a sigma 2-enriched cytosolic fraction, or (b) purified cytochrome b559, incorporated in liposomes, and purified sigma 2. Sigma 1 was purified by a sequence comprising ammonium sulfate fractionation, hydrophobic chromatography on phenyl-Superose, absorption with CM-Sepharose, anion exchange chromatography on DEAE-Sepharose, and gel filtration on Superose 12. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis of sigma 1 of maximal purity, under both reducing and nonreducing conditions, demonstrated the presence of two proteins, of 24 and 22 kDa. On gel filtration, sigma 1 was eluted as a symmetrical peak of 46 kDa that by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis revealed the presence of both 24- and 22-kDa bands. We suggest that, in its native form, sigma 1 might represent a complex of the 24- and 22-kDa proteins. The specific roles of each molecule in NADPH oxidase function remain to be determined.

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Crossref · 10.1016/s0021-9258(18)54322-2

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  • H2O2 can modulate gene expression by epigenetic modification and activate transcription factors such as AP-1, NRF2, CREB, HSF1, HIF-1, TP53, NF-κβ, NOTCH, SP1, SCREB-1 and FOXO family.

    “For example, H2O2 can also modulate genes expression by epigenetic modification and activate transcription factors such as AP-1, NRF2, CREB, HSF1, HIF-1, TP53, NF-κβ, NOTCH, SP1, SCREB-1 and FOXO family [14,15,16,17,18,19,20,21,22].”

    From The Role of Reactive Species on Innate Immunity (2022) · cites this paper as [21]

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Authors
Abo, A., & Pick, E.
Affiliations
Tel Aviv University (IL)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1991-12
Volume
266
Issue
35
Pages
23577-23585
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1595823827
Cited by
79
References
48
Citations by year
2026: 1 · 2025: 1 · 2023: 6 · 2022: 1 · 2021: 2 · 2017: 1 · 2014: 1
FWCI
4.86
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
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
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
Keywords
NADPH oxidase, superoxide production, macrophages, p47phox, p67phox, cytochrome b559, anionic amphiphiles, phagocyte activation, protein complexes, protein purification, cell-free system, liposomes, 24 kDa protein, 22 kDa protein
MeSH terms
Animals, Cell Membrane, Cell-Free System, Chromatography, Ion Exchange, Cytochrome b Group, Cytosol, Guinea Pigs, Macrophages, Molecular Weight, NADH, NADPH Oxidoreductases, Superoxides, NADPH Oxidases, Photosystem II Protein Complex, Macromolecular Substances

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