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Paulela JA, Gomes F, Camandona VDL, Alegria TGP, Netto LES, Bleicher L, Barros MH, Ferreira-Junior JR. Coq3p relevant residues for protein activity and stability. FEMS Yeast Res 2021; 21:6424906. [PMID: 34755843 DOI: 10.1093/femsyr/foab055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 11/03/2021] [Indexed: 11/14/2022] Open
Abstract
Coenzyme Q (CoQ) is an essential molecule that consists of a highly substituted benzene ring attached to a polyprenyl tail anchored in the inner mitochondrial membrane. CoQ transfers electrons from NADH dehydrogenase and succinate dehydrogenase complexes toward ubiquinol-cytochrome c reductase, and that allows aerobic growth of cells. In Saccharomyces cerevisiae, the synthesis of CoQ depends on fourteen proteins Coq1p-Co11p, Yah1p, Arh1p, and Hfd1p. Some of these proteins are components of CoQ synthome. Using ab initio molecular modeling and site-directed mutagenesis, we identified the functional residues of the O-methyltransferase Coq3p, which depends on S-adenosylmethionine for catalysis and is necessary for two O-methylation steps required for CoQ maturation. Conserved residues as well as those that coevolved in the protein structure were found to have important roles in respiratory growth, CoQ biosynthesis, and also in the stability of CoQ synthome proteins. Finally, a multiple sequence alignment showed that S. cerevisiae Coq3p has a 45 amino acid residues insertion that is poorly conserved or absent in oleaginous yeast, cells that can store up to 20% of their dry weight as lipids. These results point to the Coq3p structural determinants of its biological and catalytic function and could contribute to the development of lipid-producing yeast for biotechnology.
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Affiliation(s)
- Janaina A Paulela
- Departamento de Microbiologia - Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes, 1374 - Butantã - São Paulo-SP - CEP 05508-000, Brazil
| | - Fernando Gomes
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, travessa 14, número 321, Cidade Universitária, São Paulo-SP, CEP 05508-090, Brazil
| | - Vittoria de Lima Camandona
- Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, Rua Arlindo Bettio, 1000 - Vila Guaraciaba - São Paulo-SP - CEP 03828-000, Brazil
| | - Thiago G P Alegria
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, travessa 14, número 321, Cidade Universitária, São Paulo-SP, CEP 05508-090, Brazil
| | - Luis E S Netto
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, travessa 14, número 321, Cidade Universitária, São Paulo-SP, CEP 05508-090, Brazil
| | - Lucas Bleicher
- Departamento de Bioquímica e Imunologia - Instituto de Ciências Biológicas - Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627 - Campus Pampulha - Belo Horizonte-MG CEP 31270-901, Brazil
| | - Mario H Barros
- Departamento de Microbiologia - Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes, 1374 - Butantã - São Paulo-SP - CEP 05508-000, Brazil
| | - Jose Ribamar Ferreira-Junior
- Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, Rua Arlindo Bettio, 1000 - Vila Guaraciaba - São Paulo-SP - CEP 03828-000, Brazil
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Busso C, Ferreira-Júnior JR, Paulela JA, Bleicher L, Demasi M, Barros MH. Coq7p relevant residues for protein activity and stability. Biochimie 2015; 119:92-102. [DOI: 10.1016/j.biochi.2015.10.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 10/19/2015] [Indexed: 11/27/2022]
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Barros MH, Rak M, Paulela JA, Tzagoloff A. Characterization of Gtf1p, the connector subunit of yeast mitochondrial tRNA-dependent amidotransferase. J Biol Chem 2011; 286:32937-47. [PMID: 21799017 DOI: 10.1074/jbc.m111.265371] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The bacterial GatCAB operon for tRNA-dependent amidotransferase (AdT) catalyzes the transamidation of mischarged glutamyl-tRNA(Gln) to glutaminyl-tRNA(Gln). Here we describe the phenotype of temperature-sensitive (ts) mutants of GTF1, a gene proposed to code for subunit F of mitochondrial AdT in Saccharomyces cerevisiae. The ts gtf1 mutants accumulate an electrophoretic variant of the mitochondrially encoded Cox2p subunit of cytochrome oxidase and an unstable form of the Atp8p subunit of the F(1)-F(0) ATP synthase that is degraded, thereby preventing assembly of the F(0) sector. Allotopic expression of recoded ATP8 and COX2 did not significantly improve growth of gtf1 mutants on respiratory substrates. However, ts gft1 mutants are partially rescued by overexpression of PET112 and HER2 that code for the yeast homologues of the catalytic subunits of bacterial AdT. Additionally, B66, a her2 point mutant has a phenotype similar to that of gtf1 mutants. These results provide genetic support for the essentiality, in vivo, of the GatF subunit of the heterotrimeric AdT that catalyzes formation of glutaminyl-tRNA(Gln) (Frechin, M., Senger, B., Brayé, M., Kern, D., Martin, R. P., and Becker, H. D. (2009) Genes Dev. 23, 1119-1130).
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Affiliation(s)
- Mario H Barros
- Department of Microbiology, University of São Paulo, 05508-900 São Paulo, Brazil
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