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Identification of Coq11, a New Coenzyme Q Biosynthetic Protein in the CoQ-Synthome in Saccharomyces cerevisiae

Journal Article · · Journal of Biological Chemistry
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [2]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. Molecular Biology Inst.; DOE Office of Scientific and Technical Information (OSTI)
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. Molecular Biology Inst.
  3. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. Molecular Biology Inst. UCLA/DOE Inst. for Genomics and Proteomics
  4. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. Molecular Biology Inst. UCLA/DOE Inst. for Genomics and Proteomics. Dept. of Biological Chemistry
Coenzyme Q (Q or ubiquinone) is a redox active lipid composed of a fully substituted benzoquinone ring and a polyisoprenoid tail and is required for mitochondrial electron transport. In the yeast Saccharomyces cerevisiae, Q is synthesized by the products of 11 known genes, COQ1–COQ9, YAH1, and ARH1. The function of some of the Coq proteins remains unknown, and several steps in the Q biosynthetic pathway are not fully characterized. Several of the Coq proteins are associated in a macromolecular complex on the matrix face of the inner mitochondrial membrane, and this complex is required for efficient Q synthesis. In this paper, we further characterize this complex via immunoblotting and proteomic analysis of tandem affinity-purified tagged Coq proteins. We show that Coq8, a putative kinase required for the stability of the Q biosynthetic complex, is associated with a Coq6-containing complex. Additionally Q6 and late stage Q biosynthetic intermediates were also found to co-purify with the complex. A mitochondrial protein of unknown function, encoded by the YLR290C open reading frame, is also identified as a constituent of the complex and is shown to be required for efficient de novo Q biosynthesis. Finally, given its effect on Q synthesis and its association with the biosynthetic complex, we propose that the open reading frame YLR290C be designated COQ11.
Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
National Inst. of Health (NIH) (United States); National Science Foundation (NSF) (United States); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
FC02-02ER63421
OSTI ID:
1348353
Journal Information:
Journal of Biological Chemistry, Journal Name: Journal of Biological Chemistry Journal Issue: 12 Vol. 290; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

Coenzyme Q biosynthetic proteins assemble in a substrate-dependent manner into domains at ER–mitochondria contacts journal January 2019
The Endoplasmic Reticulum-Mitochondria Encounter Structure Complex Coordinates Coenzyme Q Biosynthesis journal January 2019
Coenzyme Q Biosynthesis: Evidence for a Substrate Access Channel in the FAD-Dependent Monooxygenase Coq6 journal January 2016
Investigation of candidate genes involved in the rhodoquinone biosynthetic pathway in Rhodospirillum rubrum journal May 2019
Human COQ9 Rescues a coq9 Yeast Mutant by Enhancing Coenzyme Q Biosynthesis from 4-Hydroxybenzoic Acid and Stabilizing the CoQ-Synthome journal July 2017
CoQ10 production in Schizosaccharomyces pombe is increased by reduction of glucose levels or deletion of pka1 journal April 2019
Reduction in the levels of CoQ biosynthetic proteins is related to an increase in lifespan without evidence of hepatic mitohormesis journal September 2018
Biosynthesis of coenzyme Q in eukaryotes journal July 2015
Schizosaccharomyces japonicus has low levels of CoQ 10 synthesis, respiration deficiency, and efficient ethanol production journal December 2017
Biosynthesis and applications of prenylquinones journal February 2018
Coenzyme Q10 Supplementation in Aging and Disease journal February 2018
Schizosaccharomyces japonicus has low levels of CoQ10 synthesis, respiration deficiency, and efficient ethanol production text January 2017

Figures / Tables (16)


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