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Microbiology 140 (1994), 399-407; DOI  10.1099/13500872-140-2-399
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Organization and regulation of the mitochondrial oxidative pathway in Mucor rouxii

Ruben Salcedo-Hernandez1, Edgardo Escamilla3 and José Ruiz-Herrera1,2

Departamento de Ingeniería Genética (Unidad Irapuato), Centro de Investigación y de Estudios Avanzados del IPN, Apartado Postal 629, Irapuato, Gto. Mexico
Departamento de Genética y Biología Molecular (Unidad México), Centro de Investigación y de Estudios Avanzados del IPN, Apartado Postal 629, Irapuato, Gto. Mexico
Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico

ABSTRACT

Summary: Mitochondria from spores, anaerobic yeasts and aerobic mycelium of Mucor rouxii were isolated and the components of the respiratory pathways were analysed. Our data suggest the presence in these mitochondria of three different NADH dehydrogenases, three b- and two c-type cytochromes, plus three different terminal oxidases: cytochrome c oxidase, an incompletely characterized cytochrome which, by its spectral characteristics, behaves as a cytochrome o, and a salicylhydroxamic-acid-sensitive oxidase. The composition of the respiratory chain, as well as the relative proportions of cytochromes and oxidases in the mitochondria, were distinct at each developmental stage. Our data suggest that the development of the respiratory pathways during differentiation is mainly regulated by the oxygen tension. Besides this role, oxygen also influences the relative number of mitochondria in the cells and their ultrastructural organization.

Author for correspondence: José Ruiz-Herrera. Tel: +52 462 51600. Fax: +52 462 51282.

Keywords: Mucor rouxii, respiratory pathway, mitochondria, cytochromes






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Copyright © 1994 Society for General Microbiology.