Cited by 455Neutrophil, Myeloperoxidase and Oxidative MechanismsLipid Membrane Structure and BehaviorEnzyme Structure and Function

Purified cytochrome b from human granulocyte plasma membrane is comprised of two polypeptides with relative molecular weights of 91,000 and 22,000

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Parkos, C A, Allen, R A, Cochrane, C G, Jesaitis, A J·1987·Journal of Clinical Investigation

Abstract

A new method has been developed for purification of cytochrome b from stimulated human granulocytes offering the advantage of high yields from practical quantities of whole blood. Polymorphonuclear leukocytes were treated with diisopropylfluorophosphate, degranulated and disrupted by nitrogen cavitation. Membranes enriched in cytochrome b were prepared by differential centrifugation. Complete solubilization of the cytochrome from the membranes was achieved in octylglucoside after a 1-M salt wash. Wheat germ agglutinin-conjugated Sepharose 4B specifically bound the solubilized cytochrome b and afforded a threefold purification. Eluate from the immobilized wheat germ agglutinin was further enriched by chromatography on immobilized heparin. The final 260-fold purification of the b-type cytochrome with a 20-30% yield was achieved by velocity sedimentation in sucrose density gradients. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) of the purified preparation revealed two polypeptides of Mr 91,000 and Mr 22,000. Treatment of the 125I-labeled, purified preparation with peptide:N-glycosidase F, which removes N-linked sugars, decreased relative molecular weight of the larger species to approximately 50,000, whereas beta-elimination, which removes O-linked sugars, had little or no effect on the mobility of the Mr-91,000 polypeptide. Neither of the deglycosylation conditions had any effect on electrophoretic mobility of the Mr-22,000 polypeptide. Disuccinimidyl suberate cross-linked the two polypeptides to a new Mr of 120,000-135,000 by SDS-PAGE. Antibody raised to the purified preparation immunoprecipitated spectral activity and, on Western blots, bound to the Mr-22,000 polypeptide but not the Mr-91,000 polypeptide. Western blot analysis of granulocytes from patients with X-linked chronic granulomatous disease revealed a complete absence of the Mr-22,000 polypeptide. These results (a) suggest that the two polypeptides are in close association and are part of the cytochrome b, (b) provide explanation for the molecular weight discrepancies previously reported for the protein, and (c) further support the involvement of the cytochrome in superoxide production in human neutrophils.

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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 [16]

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Authors
Parkos, C. A., Allen, R. A., Cochrane, C. G., & Jesaitis, A. J.
Affiliations
Scripps Research Institute (US)
Venue
Journal of Clinical Investigation
Published
1987-09-01
Volume
80
Issue
3
Pages
732-742
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2143908574
Cited by
455
References
51
Citations by year
2026: 4 · 2025: 3 · 2024: 5 · 2023: 5 · 2022: 2 · 2021: 4 · 2020: 2 · 2019: 4 · 2018: 4 · 2017: 6 · 2016: 3 · 2015: 5 · 2014: 12 · 2013: 12 · 2012: 6
FWCI
12.61
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • U.S. Public Health Service (RR 00833)
  • National Institute of Allergy and Infectious Diseases (AI17354, R0I AI 22735)
  • National Center for Research Resources (RR-00833)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
human granulocytes, polymorphonuclear leukocytes, plasma membrane, N-glycosylation, X-linked chronic granulomatous disease, diisopropylfluorophosphate, wheat germ agglutinin affinity chromatography, leukocyte membrane
MeSH terms
Antibodies, Cell Membrane, Cross-Linking Reagents, Cytochrome b Group, Glycosylation, Granulocytes, Humans, Immunologic Techniques, Molecular Weight, Peptides

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