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Luévano-Martínez LA, Forni MF, dos Santos VT, Souza-Pinto NC, Kowaltowski AJ. Cardiolipin is a key determinant for mtDNA stability and segregation during mitochondrial stress. Biochim Biophys Acta 2015; 1847:587-98. [PMID: 25843549 DOI: 10.1016/j.bbabio.2015.03.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Revised: 03/16/2015] [Accepted: 03/29/2015] [Indexed: 01/05/2023]
Abstract
Mitochondria play a key role in adaptation during stressing situations. Cardiolipin, the main anionic phospholipid in mitochondrial membranes, is expected to be a determinant in this adaptive mechanism since it modulates the activity of most membrane proteins. Here, we used Saccharomyces cerevisiae subjected to conditions that affect mitochondrial metabolism as a model to determine the possible role of cardiolipin in stress adaptation. Interestingly, we found that thermal stress promotes a 30% increase in the cardiolipin content and modifies the physical state of mitochondrial membranes. These changes have effects on mtDNA stability, adapting cells to thermal stress. Conversely, this effect is cardiolipin-dependent since a cardiolipin synthase-null mutant strain is unable to adapt to thermal stress as observed by a 60% increase of cells lacking mtDNA (ρ0). Interestingly, we found that the loss of cardiolipin specifically affects the segregation of mtDNA to daughter cells, leading to a respiratory deficient phenotype after replication. We also provide evidence that mtDNA physically interacts with cardiolipin both in S. cerevisiae and in mammalian mitochondria. Overall, our results demonstrate that the mitochondrial lipid cardiolipin is a key determinant in the maintenance of mtDNA stability and segregation.
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Affiliation(s)
- Luis Alberto Luévano-Martínez
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Cidade Universitária, Av. Prof. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil.
| | - Maria Fernanda Forni
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Cidade Universitária, Av. Prof. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil
| | - Valquiria Tiago dos Santos
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Cidade Universitária, Av. Prof. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil
| | - Nadja C Souza-Pinto
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Cidade Universitária, Av. Prof. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil
| | - Alicia J Kowaltowski
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Cidade Universitária, Av. Prof. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil
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