Carbon and nitrogen sources have no impact on the organization and composition of ustilago maydis respiratory supercomplexes

Deyamira Matuz-Mares, Oscar Flores-Herrera, Guadalupe Guerra-Sánchez, Lucero Romero-Aguilar, Héctor Vázquez-Meza, Genaro Matus-Ortega, Federico Martínez, Juan Pablo Pardo

Research output: Contribution to journalArticlepeer-review

Abstract

Respiratory supercomplexes are found in mitochondria of eukaryotic cells and some bacteria. A hypothetical role of these supercomplexes is electron channeling, which in principle should increase the respiratory chain efficiency and ATP synthesis. In addition to the four classic respiratory complexes and the ATP synthase, U. maydis mitochondria contain three type II NADH dehydrogenases (NADH for reduced nicotinamide adenine dinucleotide) and the alternative oxi-dase. Changes in the composition of the respiratory supercomplexes due to energy requirements have been reported in certain organisms. In this study, we addressed the organization of the mi-tochondrial respiratory complexes in U. maydis under diverse energy conditions. Supercomplexes were obtained by solubilization of U. maydis mitochondria with digitonin and separated by blue native polyacrylamide gel electrophoresis (BN-PAGE). The molecular mass of supercomplexes and their probable stoichiometries were 1200 kDa (I1:IV1), 1400 kDa (I1:III2), 1600 kDa (I1:III2:IV1), and 1800 kDa (I1:III2:IV2). Concerning the ATP synthase, approximately half of the protein is present as a dimer and half as a monomer. The distribution of respiratory supercomplexes was the same in all growth conditions. We did not find evidence for the association of complex II and the alternative NADH dehydrogenases with other respiratory complexes.

Original languageEnglish
Article number42
Pages (from-to)1-14
Number of pages14
JournalJournal of Fungi
Volume7
Issue number1
DOIs
StatePublished - Jan 2021

Keywords

  • Mitochondrial supercomplexes
  • Respiratory complexes
  • Ustilago maydis mitochondria

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