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PMID: 11248021 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Assembly of the neutrophil respiratory burst oxidase: a direct interaction between p67PHOX and cytochrome b558.

Dang PM, Cross AR, Babior BM

Abstract

Activation of the phagocyte NADPH oxidase complex requires the assembly of the cytosolic factors p47(PHOX), p67(PHOX), p40(PHOX), and Rac1 or Rac2, with the membrane-bound cytochrome b(558). Whereas the interaction of p47(PHOX) with cytochrome b(558) is well established, an interaction between p67(PHOX) and cytochrome b(558) has never been investigated. We report here a direct interaction between p67(PHOX) and cytochrome b(558). First, labeled p67(PHOX) recognizes a 91-kDa band in specific granules from a normal patient but not from a cytochrome b(558)-deficient patient. Second, p67(PHOX) binds to cytochrome b(558) that has been bound to nitrocellulose. Third, GTP-p67(PHOX) bound to glutathione agarose is able to pull down cytochrome b(558.) Rac1-GTP or Rac1-GDP increased the binding of p67(PHOX) to cytochrome b(558), suggesting that at least one of the oxidase-related functions of Rac1 is to promote the interaction between p67(PHOX) and cytochrome b(558).

MeSH Terms
Cytochrome b Group/metabolism Guanosine 5'-O-(3-Thiotriphosphate)/metabolism Humans Membrane Glycoproteins/metabolism NADH, NADPH Oxidoreductases/metabolism NADPH Oxidase 2 NADPH Oxidases/genetics,metabolism Neutrophils/enzymology Phosphoproteins/genetics,metabolism Recombinant Fusion Proteins/genetics,metabolism Respiratory Burst rac1 GTP-Binding Protein/metabolism
Chemicals
Cytochrome b Group Membrane Glycoproteins Phosphoproteins Recombinant Fusion Proteins neutrophil cytosol factor 67K Guanosine 5'-O-(3-Thiotriphosphate) cytochrome b558 NADH, NADPH Oxidoreductases CYBB protein, human NADPH Oxidase 2 NADPH Oxidases superoxide-forming enzyme rac1 GTP-Binding Protein
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Dang P M
Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
Cross A R
Babior B M
References (22)
22 references, click to expand
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
2001-03-13
Pages
3001-5
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC30596
Subset
IM
Grants
NIAID NIH HHS · R01 AI024838 · United States
NIAID NIH HHS · R01 AI024227 · United States
NIAID NIH HHS · AI-24838 · United States
NIAID NIH HHS · AI-28479 · United States
NIAID NIH HHS · AI-24227 · United States
NIAID NIH HHS · R01 AI028479 · United States
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