Respiratory chain complex I is essential for sexual development in neurospora and binding of iron sulfur clusters are required for enzyme assembly

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

duarte, m (Autor) Outra; videira, a (Autor) ICBAS

Revista

Título: Genetics

Vol. 156

Páginas: 607-615

ISSN: 0016-6731

Editora: Genetics Society of America

Indexação

ISI Web of Knowledge - 23 Citações

Scopus - 23 Citações

Outras Informações

ID Authenticus: P-000-YV4

Abstract (EN): We have cloned and disrupted in vivo, by repeat-induced point mutations, the nuclear gene coding for an iron sulfur subunit of complex I from Neurospora crassa, homologue of the mammalian TYKY protein. Analysis of the obtained mutant nuo21.3c revealed that complex I fails to assemble. The peripheral arm of the enzyme is disrupted while its membrane arm accumulates. Furthermore, mutated 21.3c-kD proteins, in which selected cysteine residues were substituted with alanines or serines, were expressed in mutant nuo21.3c. The phenotypes of these strains regarding the formation of complex I are similar to that of the original mutant, indicating that binding of iron sulfur centers to protein subunits is a prerequisite for complex I assembly. Homozygous crosses of nuo21.3c strain, and of other complex I mutants, are unable to complete sexual development. The crosses are blocked at an early developmental stage, before fusion of the nuclei of opposite mating types. This phenotype can be rescued only by transformation with the intact gene. Our results suggest that this might be due to the compromised capacity of complex I-defective strains in energy production.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9