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Islam MD, Harrison BD, Li JJY, McLoughlin AG, Court DA. Do mitochondria use efflux pumps to protect their ribosomes from antibiotics? MICROBIOLOGY (READING, ENGLAND) 2023; 169:001272. [PMID: 36748523 PMCID: PMC9993110 DOI: 10.1099/mic.0.001272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Fungal environments are rich in natural and engineered antimicrobials, and this, combined with the fact that fungal genomes are rich in coding sequences for transporters, suggests that fungi are an intriguing group in which to search for evidence of antimicrobial efflux pumps in mitochondria. Herein, the range of protective mechanisms used by fungi against antimicrobials is introduced, and it is hypothesized, based on the susceptibility of mitochondrial and bacterial ribosomes to the same antibiotics, that mitochondria might also contain pumps that efflux antibiotics from these organelles. Preliminary evidence of ethidium bromide efflux is presented and several candidate efflux pumps are identified in fungal mitochondrial proteomes.
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Affiliation(s)
- Md Deen Islam
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | - Brian D Harrison
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | - Judy J-Y Li
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | - Austein G McLoughlin
- Department of Microbiology, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
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Yang G, Zhao T, Lu S, Weng J, Zeng X. T1121G Point Mutation in the Mitochondrial Gene COX1 Suppresses a Null Mutation in ATP23 Required for the Assembly of Yeast Mitochondrial ATP Synthase. Int J Mol Sci 2022; 23:ijms23042327. [PMID: 35216443 PMCID: PMC8877559 DOI: 10.3390/ijms23042327] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/10/2022] [Accepted: 02/16/2022] [Indexed: 02/04/2023] Open
Abstract
Nuclear-encoded Atp23 was previously shown to have dual functions, including processing the yeast Atp6 precursor and assisting the assembly of yeast mitochondrial ATP synthase. However, it remains unknown whether there are genes functionally complementary to ATP23 to rescue atp23 null mutant. In the present paper, we screen and characterize three revertants of atp23 null mutant and reveal a T1121G point mutation in the mitochondrial gene COX1 coding sequence, which leads to Val374Gly mutation in Cox1, the suppressor in the revertants. This was verified further by the partial restoration of mitochondrial ATP synthase assembly in atp23 null mutant transformed with exogenous hybrid COX1 T1121G mutant plasmid. The predicted tertiary structure of the Cox1 p.Val374Gly mutation showed no obvious difference from wild-type Cox1. By further chase labeling with isotope [35S]-methionine, we found that the stability of Atp6 of ATP synthase increased in the revertants compared with the atp23 null mutant. Taking all the data together, we revealed that the T1121G point mutation of mitochondrial gene COX1 could partially restore the unassembly of mitochondrial ATP synthase in atp23 null mutant by increasing the stability of Atp6. Therefore, this study uncovers a gene that is partially functionally complementary to ATP23 to rescue ATP23 deficiency, broadening our understanding of the relationship between yeast the cytochrome c oxidase complex and mitochondrial ATP synthase complex.
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Woo DK, Jung YW, O'Brien KM, Poyton RO. Molecular characterization of a mitochondrial mutant carrying point mutations in the 3′ untranslated region of theCOX3mRNA fromSaccharomyces cerevisiae. Anim Cells Syst (Seoul) 2013. [DOI: 10.1080/19768354.2013.782898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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4
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Chen W, Islas-Osuna MA, Dieckmann CL. Suppressor analysis of mutations in the 5'-untranslated region of COB mRNA identifies components of general pathways for mitochondrial mRNA processing and decay in Saccharomyces cerevisiae. Genetics 1999; 151:1315-25. [PMID: 10101159 PMCID: PMC1460556 DOI: 10.1093/genetics/151.4.1315] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The cytochrome b gene in Saccharomyces cerevisiae, COB, is encoded by the mitochondrial genome. Nuclear-encoded Cbp1 protein is required specifically for COB mRNA stabilization. Cbp1 interacts with a CCG element in a 64-nucleotide sequence in the 5'-untranslated region of COB mRNA. Mutation of any nucleotide in the CCG causes the same phenotype as cbp1 mutations, i.e., destabilization of both COB precursor and mature message. In this study, eleven nuclear suppressors of single-nucleotide mutations in CCG were isolated and characterized. One dominant suppressor is in CBP1, while the other 10 semidominant suppressors define five distinct linkage groups. One group of four mutations is in PET127, which is required for 5' end processing of several mitochondrial mRNAs. Another mutation is linked to DSS1, which is a subunit of mitochondrial 3' --> 5' exoribonuclease. A mutation linked to the SOC1 gene, previously defined by recessive mutations that suppress cbp1 ts alleles and stabilize many mitochondrial mRNAs, was also isolated. We hypothesize that the products of the two uncharacterized genes also affect mitochondrial RNA turnover.
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Affiliation(s)
- W Chen
- Department of Biochemistry, University of Arizona, Tucson, Arizona 85721, USA
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Chen W, Dieckmann CL. Genetic evidence for interaction between Cbp1 and specific nucleotides in the 5' untranslated region of mitochondrial cytochrome b mRNA in Saccharomyces cerevisiae. Mol Cell Biol 1997; 17:6203-11. [PMID: 9343381 PMCID: PMC232471 DOI: 10.1128/mcb.17.11.6203] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The cytochrome b (COB) gene is encoded by the mitochondrial genome; however, its expression requires the participation of several nuclearly encoded protein factors. The yeast Cbp1 protein, which is encoded by the nuclear CBP1 gene, is required for the stabilization of COB mRNA. A previous deletion analysis identified an 11-nucleotide-long sequence within the 5' untranslated region of COB mRNA that is important for Cbp1-dependent COB mRNA stability. In the present study, site-directed mutagenesis experiments were carried out to define further the features of this cis element. The CCG sequence within this region was shown to be necessary for stability. A change in residue 533 of Cbp1 from aspartate to tyrosine suppresses the effects of a single-base change in the CCG element. This is strong genetic evidence that the nuclearly encoded Cbp1 protein recognizes and binds directly to the sequence containing CCG and thus protects COB mRNA from degradation.
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MESH Headings
- Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
- Cytochrome b Group/genetics
- DNA-Binding Proteins/metabolism
- Fungal Proteins/metabolism
- Gene Expression Regulation, Fungal
- Genes, Fungal
- Mitochondria/genetics
- Models, Genetic
- Mutagenesis, Site-Directed
- Nucleic Acid Conformation
- Oxygen Consumption/genetics
- Polymerase Chain Reaction
- Protein Binding
- Protein Biosynthesis
- RNA, Fungal/genetics
- RNA, Fungal/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- RNA-Binding Proteins/metabolism
- Saccharomyces cerevisiae/genetics
- Saccharomyces cerevisiae Proteins
- Sequence Analysis, DNA
- Suppression, Genetic
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Affiliation(s)
- W Chen
- Department of Biochemistry, University of Arizona, Tucson 85721, USA
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6
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Mittelmeier TM, Dieckmann CL. In vivo analysis of sequences required for translation of cytochrome b transcripts in yeast mitochondria. Mol Cell Biol 1995; 15:780-9. [PMID: 7823946 PMCID: PMC231951 DOI: 10.1128/mcb.15.2.780] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Respiratory chain proteins encoded by the yeast mitochondrial genome are synthesized within the organelle. Mitochondrial mRNAs lack a 5' cap structure and contain long AU-rich 5' untranslated regions (UTRs) with many potential translational start sites and no apparent Shine-Dalgarno-like complementarity to the 15S mitochondrial rRNA. However, translation initiation requires specific interactions between the 5' UTRs of the mRNAs, mRNA-specific activators, and the ribosomes. In an initial step toward identifying potential binding sites for the mRNA-specific translational activators and the ribosomes, we have analyzed the effects of deletions in the 5' UTR of the mitochondrial COB gene on translation of COB transcripts in vivo. The deletions define two regions of the COB 5' UTR that are important for translation and indicate that sequence just 5' of the AUG is involved in selection of the correct start codon. Taken together, the data implicate specific regions of the 5' UTR of COB mRNA as possible targets for the mitochondrial translational machinery.
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Affiliation(s)
- T M Mittelmeier
- Department of Molecular and Cellular Biology, University of Arizona, Tucson 85721
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7
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In vivo analysis of sequences necessary for CBP1-dependent accumulation of cytochrome b transcripts in yeast mitochondria. Mol Cell Biol 1993. [PMID: 8321224 DOI: 10.1128/mcb.13.7.4203] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In Saccharomyces cerevisiae, cytochrome b, an essential component of the respiratory chain, is encoded by the mitochondrial gene cob. The cob transcription unit includes the tRNA(Glu) gene from positions -1170 to -1099 relative to the cob ATG at +1. The initial tRNA(Glu)-cob transcript undergoes several processing events, including removal of tRNA(Glu) and production of the mature 5' end of cob mRNA at nucleotide -954. The nuclear gene product CBP1 is specifically required for the accumulation of cob mRNA. In cbp1 mutant strains, cob transcripts are not detectable by Northern (RNA) blot analysis, but the steady-state level of tRNA(Glu) is similar to that of wild type. The results of a previous study led to the conclusion that a 400-nucleotide region just downstream of tRNA(Glu) is sufficient for CBP1 function. In the present study, the microprojectile bombardment method of mitochondrial transformation was used to introduce deletions within this region of cob. The analysis of cob transcripts in strains carrying the mitochondrial deletion genomes indicates that a 63-nucleotide sequence that encompasses the cleavage site at -954 is sufficient both for CBP1 function and for correct positioning of the cleavage. Furthermore, the data indicate that CBP1 prevents the degradation of unprocessed cob transcripts produced by endonucleolytic cleavage at the 3' end of tRNA(Glu).
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8
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Mittelmeier TM, Dieckmann CL. In vivo analysis of sequences necessary for CBP1-dependent accumulation of cytochrome b transcripts in yeast mitochondria. Mol Cell Biol 1993; 13:4203-13. [PMID: 8321224 PMCID: PMC359970 DOI: 10.1128/mcb.13.7.4203-4213.1993] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
In Saccharomyces cerevisiae, cytochrome b, an essential component of the respiratory chain, is encoded by the mitochondrial gene cob. The cob transcription unit includes the tRNA(Glu) gene from positions -1170 to -1099 relative to the cob ATG at +1. The initial tRNA(Glu)-cob transcript undergoes several processing events, including removal of tRNA(Glu) and production of the mature 5' end of cob mRNA at nucleotide -954. The nuclear gene product CBP1 is specifically required for the accumulation of cob mRNA. In cbp1 mutant strains, cob transcripts are not detectable by Northern (RNA) blot analysis, but the steady-state level of tRNA(Glu) is similar to that of wild type. The results of a previous study led to the conclusion that a 400-nucleotide region just downstream of tRNA(Glu) is sufficient for CBP1 function. In the present study, the microprojectile bombardment method of mitochondrial transformation was used to introduce deletions within this region of cob. The analysis of cob transcripts in strains carrying the mitochondrial deletion genomes indicates that a 63-nucleotide sequence that encompasses the cleavage site at -954 is sufficient both for CBP1 function and for correct positioning of the cleavage. Furthermore, the data indicate that CBP1 prevents the degradation of unprocessed cob transcripts produced by endonucleolytic cleavage at the 3' end of tRNA(Glu).
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Affiliation(s)
- T M Mittelmeier
- Department of Molecular and Cellular Biology, University of Arizona, Tucson 85721
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9
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Jault JM, Di Pietro A, Falson P, Gautheron DC, Boutry M, Goffeau A. A yeast strain with mutated beta-subunits of mitochondrial ATPase-ATPsynthase: high azide and bicarbonate sensitivity of the ATPase activity. Biochem Biophys Res Commun 1989; 158:392-9. [PMID: 2521789 DOI: 10.1016/s0006-291x(89)80060-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A phenotypic revertant with modified beta-subunits of mitochondrial ATPase-ATP synthase has been obtained for the first time by selection from a beta-less mutant of the yeast Schizosaccharomyces pombe. Contrary to the parental mutant, the phenotypic revertant grows on glycerol, has normal respiratory activity and shows immunodetectable beta-subunits. However the kinetic properties of its submitochondrial particles ATPase activity differ markedly from those of the wild strain. The optimal pH is increased by about one unit. The maximal rate of the revertant ATPase activity at pH 8.5 is 4 to 5-fold lower than that of the wild strain, but it can be greatly increased upon addition of bicarbonate whereas the wild strain is completely insensitive to this anion. Furthermore the revertant ATPase activity is much more sensitive to azide inhibition. The results suggest that ADP dissociation is the rate-limiting step of ATP hydrolysis by the revertant.
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Affiliation(s)
- J M Jault
- Laboratoire de Biologie et Technologie des Membranes du CNRS, Université Claude Bernard de Lyon, Villeurbanne, France
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10
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Assembly of the mitochondrial membrane system. Analysis of structural mutants of the yeast coenzyme QH2-cytochrome c reductase complex. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)68224-9] [Citation(s) in RCA: 120] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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11
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Wolf K, Del Giudice L. The variable mitochondrial genome of ascomycetes: organization, mutational alterations, and expression. ADVANCES IN GENETICS 1988; 25:185-308. [PMID: 3057820 DOI: 10.1016/s0065-2660(08)60460-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- K Wolf
- Institut für Genetik und Mikrobiologie, Universität München, Munich, Federal Republic of Germany
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12
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Bonjardim CA, Nóbrega FG. Nucleotide substitutions in a yeast mitochondria cis-acting mutant located in the last intron of the apocytochrome b gene. FEBS Lett 1984; 169:73-8. [PMID: 6325238 DOI: 10.1016/0014-5793(84)80292-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The region of mitochondrial DNA corresponding to the intron mutant M6-200 in Saccharomyces cerevisiae D273-10B has been isolated, and the nucleotide sequence of a 519 bp RsaI fragment has been determined. Three nucleotide substitutions were found at nucleotides +2650 (G----T), +2668 (G----A) and +2798 (A----G), all within the genetically defined location in the gene. Particular significance can be attributed to the first two changes (+2650 and +2668), that can be genetically isolated from the third substitution and, in addition, alter conserved sequence features detected in a study [(1982) Biochimie 64, 867-881] of fungal mitochondrial introns.
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13
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Connerton IF, Ray MK, Lancashire WE, Griffiths DE. Genetics of oxidative phosphorylation: petite deletion mapping of the Oli 2 region of the mitochondrial genome of Saccharomyces cerevisiae. MOLECULAR & GENERAL GENETICS : MGG 1984; 193:149-52. [PMID: 6318047 DOI: 10.1007/bf00327428] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Petite deletion mapping has been carried out for the Oli 2 region of the mitochondrial genome of Saccharomyces cerevisiae to produce a fine structure genetic map. Previously unlocated mit- mutants together with the drug resistant loci Oli 2 and Oss 1 have been ordered between the cytochrome oxidase and apocytochrome b genes. As a result of this study a series of isogenic p- clones have been isolated spanning the Oli 2 region.
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14
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Lamb MR, Anziano PQ, Glaus KR, Hanson DK, Klapper HJ, Perlman PS, Mahler HR. Functional domains in introns. RNA processing intermediates in cis- and trans-acting mutants in the penultimate intron of the mitochondrial gene for cytochrome b. J Biol Chem 1983. [DOI: 10.1016/s0021-9258(18)33086-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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15
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16
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Assembly of the mitochondrial membrane system. Characterization of the oxi2 transcript and localization of its promoter in Saccharomyces cerevisiae D273-10B. J Biol Chem 1983. [DOI: 10.1016/s0021-9258(18)33298-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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17
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Assembly of the mitochondrial membrane system. Analysis of the nucleotide sequence and transcripts in the oxi1 region of yeast mitochondrial DNA. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(18)42963-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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18
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Bechmann H, Haid A, Schweyen R, Mathews S, Kaudewitz F. Expression of the “split gene” COB in yeast mtDNA. Translation of intervening sequences in mutant strains. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(19)69640-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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19
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Brain pyridoxal kinase. Mechanism of substrate addition, binding of ATP, and rotational mobility of the inhibitor pyridoxaloxime. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(19)70044-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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20
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Bonitz S, Coruzzi G, Thalenfeld B, Tzagoloff A, Macino G. Assembly of the mitochondrial membrane system. Physical map of the Oxi3 locus of yeast mitochondrial DNA. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(19)70223-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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21
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Lazowska J, Jacq C, Slonimski PP. Sequence of introns and flanking exons in wild-type and box3 mutants of cytochrome b reveals an interlaced splicing protein coded by an intron. Cell 1980; 22:333-48. [PMID: 7004642 DOI: 10.1016/0092-8674(80)90344-x] [Citation(s) in RCA: 417] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We have determined the DNA sequence of the wild type and mutated introns as well as their flanking exons in the yeast mitochondrial gene specifying cytochrome b. The second intron (box3) encodes a trans-acting protein "mRNA maturase" responsible for splicing and maturation of cytochrome b mRNA. This protein is interlaced with cytochrome b exon sequences. Its biosynthesis is subject to a negative feedback which may constitute a regulatory mechanism for the expression of split genes.
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22
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Assembly of the mitochondrial membrane system. DNA sequence and organization of the cytochrome b gene in Saccharomyces cerevisiae D273-10B. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43467-9] [Citation(s) in RCA: 262] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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23
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Meunier-Lemesle D, Chevillotte-Brivet P, Pajot P. Cytochrome b-565 in Saccharomyces cerevisiae: use of mutants in the cob-box region of the mitochondrial DNA to study the functional role of this spectral species of cytochrome b. 1. Measurements of cytochromes b-562 and b-565 and selection of revertants devoid of cytochrome b-565. EUROPEAN JOURNAL OF BIOCHEMISTRY 1980; 111:151-9. [PMID: 7002556 DOI: 10.1111/j.1432-1033.1980.tb06087.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In order to study the functional role of the spectral species of cytochrome b-565 observed in mitochondria, genetically manipulated strains of Saccharomyces cerevisiae have been used. Strains have been found which are devoid of cytochrome b-565 under certain conditions and which nevertheless are able to grow on a respirable substrate. Two different methods have been used to determine the cytochrome b-565 content: anaerobic titrations and antimycin-A-induced reduction of cytochrome b-565. Both yield the same results.
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24
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Nobrega F, Tzagoloff A. Assembly of the mitochondrial membrane system. Complete restriction map of the cytochrome b region of mitochondrial DNA in Saccharomyces cerevisiae D273-10B. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43466-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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25
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Takácsová G, Subík J, Kotylak Z. Localization of mucidin-resistant locus muc3 on mitochondrial DNA with respect to ubiquinol-cytochrome c reductase deficient box loci. Locus muc3 is allelic to box2. MOLECULAR & GENERAL GENETICS : MGG 1980; 179:141-6. [PMID: 6256605 DOI: 10.1007/bf00268456] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Genetic relations between mitochondrial mucidin-resistant locus muc3 and ubiquinol-cytochrome c reductase-deficient box loci have been studied by recombination and petite deletion analysis. It was found that the locus muc3 maps in the segment of mitochondrial DNA corresponding to the locus box2. The results suggest the participation of box2/muc3 locus in the sequences of the structural gene for cytochrome b.
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26
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Everett TD, Finzi E, Beattie DS. Stimulation of yeast mitochondrial protein synthesis by postpolysomal supernatants from yeast, rat liver, and Escherichia coli. Arch Biochem Biophys 1980; 200:467-73. [PMID: 7002044 DOI: 10.1016/0003-9861(80)90378-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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27
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Roberts H, Smith SC, Marzuki S, Linnane AW. Evidence that cytochrome b is the antimycin-binding component of the yeast mitochondrial cytochrome bc1 complex. Arch Biochem Biophys 1980; 200:387-95. [PMID: 7002042 DOI: 10.1016/0003-9861(80)90368-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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28
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Berlani RE, Pentella C, Macino G, Tzagoloff A. Assembly of the mitochondrial membrane system: isolation of mitochondrial transfer ribonucleic acid mutants and characterization of transfer ribonucleic acid genes of Saccharomyces cerevisiae. J Bacteriol 1980; 141:1086-97. [PMID: 6245059 PMCID: PMC293786 DOI: 10.1128/jb.141.3.1086-1097.1980] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
A method is described for isolating cytoplasmic mutants of Saccharomyces cerevisiae with lesions in mitochondrial transfer ribonucleic acids (tRNA's). The mutants were selected for slow growth on glycerol and for restoration of wild-type growth by cytoplasmic "petite" testers that contain regions of mitochondrial deoxyribonucleic acid (DNA) with tRNA genes. The aminoacylated mitochondrial tRNA's of several presumptive tRNA mutants were analyzed by reverse-phase chromatography on RPC-5. Two mutant strains, G76-26 and G76-35, were determined to carry mutations in the cysteine and histidine tRNA genes, respectively. The cysteine tRNA mutant was used to isolate cytoplasmic petite mutants whose retained segments of mitochondrial DNA contain the cysteine tRNA gene. The segment of one such mutant (DS504) was sequenced and shown to have the cysteine, histidine, and threonine tRNA genes. The structures of the three mitochondrial tRNA's were deduced from the DNA sequence.
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29
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Beattie DS, Battie CA, Weiss RA. Studies on the biogenesis of an enzymatically active complex III of the respiratory chain from yeast mitochondria. JOURNAL OF SUPRAMOLECULAR STRUCTURE 1980; 14:139-48. [PMID: 6262574 DOI: 10.1002/jss.400140203] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Complex III isolated from yeast mitochondria catalyzed an antimycin A and Diuron-sensitive coenzyme QH2-cytochrome c reductase activity with a turnover number of 15.7 sec(-1) and contained 10 nmoles of cytochrome b and 4.6 nmoles of cytochrome c1 per mg of protein. Electrophoresis in sodium dodecyl sulfate acrylamide gels resolved Complex III into 10 bands with apparent molecular weights of 50,000, 40,000, 30,000, 29,000, 24,000, 17,000, 16,000, 12,000, 8,400, and 5,800. Yeast cells were labeled under nongrowing conditions with (35S)-methionine in the absence or presence of inhibitors of cytoplasmic or mitochondrial protein synthesis. Labeled Complex III was isolated by immunoprecipitation from detergent-solubilized mitochondria using anti-serum raised against the purified complex. Analysis of the immunoprecipitates by polyacrylamide gel electrophoresis revealed that a 30,000-dalton protein, cytochrome b, as well as 16,000-dalton protein were labeled in the presence of cycloheximide, indicating that they are products of mitochondrial protein synthesis. Immunoprecipitates from mitochondria obtained from cells labeled in the presence of chloramphenicol contained a new radioactive peak with a molecular weight of 100,000. In addition, significant decreases in the labeling of the proteins with molecular weights of 50,000, 40,000, 30,000, and 16,000 were observed. When Complex III was isolated by immunoprecipitation from intact spheroplasts after a 5-minute pulse with (35S)-methionine, the 100,000-dalton protein was labeled in the immunoprecipitate whether or not chloramphenicol was present; however, after a 1-hour chase with unlabeled methionine, decreased labeling of the 100,000-dalton protein was observed concomitant with an increased labeling of the 50,000- and 40,000-dalton proteins. These results suggest that a protein with a molecular weight of 100,000 may either be a precursor or a partially assembled form of other proteins of Complex III, most probably the two largest polypeptides.
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Roberts H, Choo WM, Murphy M, Marzuki S, Lukins HB, Linnane SW. mit- Mutations in the oli2 region of mitochondrial DNA affecting the 20 000 dalton subunit of the mitochondrial ATPase in Saccharomyces cerevisiae. FEBS Lett 1979; 108:501-4. [PMID: 230092 DOI: 10.1016/0014-5793(79)80597-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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31
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Kreike J, Bechmann H, Van Hemert FJ, Schweyen RJ, Boer PH, Kaudewitz F, Groot GS. The identification of apocytochrome b as a mitochondrial gene product and immunological evidence for altered apocytochrome b in yeast strains having mutations in the COB region of mitochondrial DNA. EUROPEAN JOURNAL OF BIOCHEMISTRY 1979; 101:607-17. [PMID: 391561 DOI: 10.1111/j.1432-1033.1979.tb19755.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The yeast mitochondrial translation product of Mr 30 000 is identical with apocytochrome b. After labelling in vivo with [35S]sulphate in the presence of cycloheximide, the radioactivity in this product present in solubilized submitochondrial particles, was completely recovered in pure cytochrome bc1 complex as a single polypeptide. We show that this translation product is identical with apocytochrome b using peptide mapping by limited proteolysis according to Cleveland et al. [J. Biol. Chem. 250 (1977) 8236-8242] and by immunoprecipitation with a specific antiserum against apocytochrome b. New mitochondrial translation products in 36 strains of Saccharomyces cerevisiae having mutations in the COB region of the mitochondrial DNA, are precipitated by this antiserum. This is consistent with the assumption that many of the cob mutations are localized in the structural gene for apolcytochrome b on mitochondrial DNA. Mutations in two intervening sequences can give rise to products related to apocytochrome b that are considerably longer than normal apocytochrome b. We discuss the hypothesis that in these mutants splicing of the messenger RNA does not occur correctly and that, as a consequence of this, ribosomes read through in an intervening sequence.
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Sebald W, Wachter E, Tzagoloff A. Identification of amino acid substitutions in the dicyclohexylcarbodiimide-binding subunit of the mitochondrial ATPase complex from oligomycin-resistant mutants of Saccharomyces cerevisiae. EUROPEAN JOURNAL OF BIOCHEMISTRY 1979; 100:599-607. [PMID: 159820 DOI: 10.1111/j.1432-1033.1979.tb04207.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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33
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Assembly of the mitochondrial membrane system. DNA sequence of subunit 2 of yeast cytochrome oxidase. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(19)86848-5] [Citation(s) in RCA: 159] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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34
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Heude M, Fukuhara H, Moustacchi E. Spontaneous and induced rho mutants of Saccharomyces cerevisiae: patterns of loss of mitochondrial genetic markers. J Bacteriol 1979; 139:460-7. [PMID: 378973 PMCID: PMC216891 DOI: 10.1128/jb.139.2.460-467.1979] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The deletion which leads to spontaneous rho mutants occurs preferentially at a unique region covering genes oxi3, pho1/OII, and mit175. The frequency of loss of genetic markers in this region was significantly higher than in other regions as determined with a 15- marker system. When various mutagenic treatments were applied, this specific pattern of deletion was also observed, but it was dramatically amplified. This suggests that the basic mechanism of rho production is the same in yeast mitochondrial genomes in both spontaneous and induced mutants.
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Hanson D, Miller D, Mahler H, Alexander N, Perlman P. Regulatory interaction between mitochondrial genes. II. Detailed characterization of novel mutants mapping within one cluster in the cob2 region. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(17)30248-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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36
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Regulatory interactions between mitochondrial genes. I. Genetic and biochemical characterization of some mutant types affecting apocytochrome b and cytochrome oxidase. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(17)30247-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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37
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Coruzzi G, Trembath MK, Tzagoloff A. The isolation of mitochondrial and nuclear mutants of Saccharomyces cerevisiae with specific defects in mitochondrial functions. Methods Enzymol 1979; 56:95-106. [PMID: 223014 DOI: 10.1016/0076-6879(79)56012-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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38
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Coruzzi G, Trembath MK, Tzagoloff A. Assembly of the mitochondrial membrane system: mutations in the pho2 locus of the mitochondrial genome of Saccharomyces cerevisiae. EUROPEAN JOURNAL OF BIOCHEMISTRY 1978; 92:279-87. [PMID: 153229 DOI: 10.1111/j.1432-1033.1978.tb12746.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Two mutants of Saccharomyces cerevisiae which show a loss of mitochondrial rutamycin-sensitive ATPase activity are described. Although phenotypically similar to mutants of the mitochondrial locus pho1 [F. Foury and A. Tzagoloff (1976) Eur. J. Biochem. 68, 113-119], these mutants define a second ATPase locus on the mitochondrial DNA (designated pho2), which is genetically unlinked to pho1. Analysis of recombination in crosses involving multiple antibiotic resistance markers indicates that the locus is in the segment of the genome between ery1 and oli2, very close to oli1. In fact it is proposed that the oli1 and pho2 mutations are in the same gene. Supporting evidence for this proposal includes: 1. The analysis of marker retention in petite mutants shows that the oli1 and pho2 loci were either retained or lost together in all cases. 2. Recombination frequencies of 0.05% or less are observed in crosses between the oli1 and pho2 loci. 3. When rho+ revertants are isolated from the pho2 mutants they frequently are oligomycin resistant. 4. pho2 mutants have an altered subunit 9 of the ATPase complex.
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Wiseman A, Attardi G. Reversible tenfod reduction in mitochondria DNA content of human cells treated with ethidium bromide. MOLECULAR & GENERAL GENETICS : MGG 1978; 167:51-63. [PMID: 739978 DOI: 10.1007/bf00270321] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cells of the human line VA2-B in suspension culture have been treated with very low concentrations of ethidium bromide for the purpose of reducing the amount of mitochondrial DNA (mit-DNA) per cell. Cells maintained in the presence of 5 ng/ml ethidium bromide grew at a normal rate for three days; thereafter, their doubling time gradually increased to a stable value of about 60 h. In these cells, the rate of 3H thymidine incorporation into mit-DNA decreased very rapidly to approximately 60% of the normal, and remained thereafter at this level, while the amount of mit-DNA per cell stabilized around a level of 70--80% of the control. In cells long-term treated with 5 ng/ml ethidium bromide, the rate of mitochondrial protein synthesis was about 35% of the normal, and the cytochrome c oxidase activity about 50% of the control. Cells treated with 20 ng/ml of the drug underwent 3--4 cell doublings at control rates, then gradually stopped growing, and eventually died. In these cells, the rate of incorporation of 3H thymidine into mit-DNA was reduced to 50% of the control value after 10 min treatment with ethidium bromide, and became barely detectable after three cell doublings. At this time, the cells had on the average less than 10% of the control amount of mit-DNA, the rate of mitochondrial protein synthesis was reduced to 3% of the normal, and the specific activities of cytochrome c oxidase and rutamycin-sensitive ATPase were less than 20% of the control values. In spite of these marked changes, the cells exhibited only a 20--30% loss in cell viability, as estimated by cloning efficiency, after three days of exposure to the drug. Cells treated with ethidium bromide at 20 ng/ml for three days, and then transferred to drug-free medium, recovered a near-to-normal growth rate and cloning efficiency and a near-to-normal rate of synthesis and amount of mit-DNA in about five days.
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Yatscoff RW, Goldstein S, Freeman KB. Conservation of genes coding for proteins synthesized in human mitochondria. SOMATIC CELL GENETICS 1978; 4:633-45. [PMID: 741350 DOI: 10.1007/bf01543155] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Proteins synthesized in mitochondria of 27 different human cell lines, identified by labeling with [35S]methionine in the presence of cycloheximide, have been enumerated and their electrophoretic mobilities determined by sodium dodecyl sulfate-polyacrylamide slab gel electrophoresis and fluorography. Twelve bands were observed in all cell lines. In 24 cell lines, the electrophoretic mobilities of the proteins were the same regardless of race, sex, tissue of origin, cell type, viral transformation, or premature biological aging syndromes. The patterns obtained for the remaining cell lines, HeLa, KB, and Hep-2 were identical. These cell lines showed one protein component that was absent in the 24 others, and lacked a component present in these cell lines. Since it has been previously asserted that KB and Hep-2 are HeLa cells, the data indicate that one basic pattern exists in human cells with a variant of unknown origin occurring in HeLa cells.
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Roberts H, Choo WM, Smith SC, Marzuki S, Linnane AW, Porter TH, Folkers K. The site of inhibition of mitochondrial electron transfer by coenzyme Q analogues. Arch Biochem Biophys 1978; 191:306-15. [PMID: 367275 DOI: 10.1016/0003-9861(78)90093-0] [Citation(s) in RCA: 72] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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43
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Foury F, Tzagoloff A. Assembly of the mitochondrial membrane system. Genetic complementation of mit- mutations in mitochondrial DNA of Saccharomyces cerevisiae. J Biol Chem 1978. [DOI: 10.1016/s0021-9258(17)34758-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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44
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Linnane AW, Nagley P. Mitochondrial genetics in perspective: the derivation of a genetic and physical map of the yeast mitochondrial genome. Plasmid 1978; 1:324-45. [PMID: 372968 DOI: 10.1016/0147-619x(78)90049-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Subík J, Takácsová G. Genetic determination of ubiquinol-cytochrome reductase: mitochondrial locus muc3 specifying resistance of Saccharomyces cerevisiae to mucidin. MOLECULAR & GENERAL GENETICS : MGG 1978; 161:99-108. [PMID: 353504 DOI: 10.1007/bf00266620] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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47
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Schweyen RJ, Weiss-Brummer B, Backhaus B, Kaudewitz F. The genetic map of the mitochondrial genome in yeast: map positions of drug' and mit- markers as revealed from population analyses of rho- clones in Saccharomyces cerevisiae. MOLECULAR & GENERAL GENETICS : MGG 1978; 159:151-60. [PMID: 345089 DOI: 10.1007/bf00270888] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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48
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Trembath MK, Macino G, Tzagoloff A. The mapping of mutations in tRNA and cytochrome oxidase genes located in the cap-par segment of the mitochondrial genome of S. cerevisiae. MOLECULAR & GENERAL GENETICS : MGG 1977; 158:35-45. [PMID: 203841 DOI: 10.1007/bf00455117] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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49
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Michaelis G, Pratje E. Mapping of the two mitochondrial antimycin A resistance loci in Saccharomyces cerevisiae. MOLECULAR & GENERAL GENETICS : MGG 1977; 156:79-85. [PMID: 340894 DOI: 10.1007/bf00272255] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Retention or loss of the two new mitochondrial antimycin A resistance loci AI and AII has been analyzed in a large number of stable cytoplasmic petite mutants. Using these deletion mutants it was possible to localize the two antimycin A resistance loci in the OI--OII region of mitochondrial DNA. The genetic loci are mapped in the following order: OII--AI--AII--cobl--OI. The mapping relationship of mutants resistant to antimycin A or funiculosin to various cob mutants is described.
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50
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Perlman PS, Douglas MG, Strausberg RL, Butow RA. Localization of genes for variant forms of mitochondrial proteins on mitochondrial DNA of Saccharomyces cerevisiae. J Mol Biol 1977; 115:675-94. [PMID: 338916 DOI: 10.1016/0022-2836(77)90109-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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