Schizosaccharomyces pombe mitochondria: morphological, respiratory and protein import characteristics

Moore, Anthony L, Walters, Andrew J, Thorpe, Julian, Thorpe, Julian, Fricaud, Anne-Catherine and Watts, Felicity Z (1992) Schizosaccharomyces pombe mitochondria: morphological, respiratory and protein import characteristics. Yeast, 8 (11). pp. 923-933. ISSN 0749503X

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A technique is described for the isolation and purification of intact, respiratory-competent mitochondria from Schizosaccharomyces pombe. The purified mitochondria are capable of oxidizing NADH and succinate as repiratory substrates, indicating the presence of succinate dehydrogenase and an NADH dehydrogenase located on the outer surface of the inner membrane. Mitochondria display good respiratory control with an ADP/O ratio of < 2. Repiratory activity is linearly dependent upon the redox poise of the quinone pool suggesting the presence of an unbranched respiratory pathway to molecular oxygen. Immunogold labelling using antisera raised against mitochondrial HSP70 proteins (SSP1, SSC1 and PHSP1) from three different species, namely S. pombe, Saccharomyces cerevisiae and the plant Pisum sativum respectively, has been used to investigate the presence and ultrastructure of the mitochondria isolated by this procedure. The immunocytochemistry was carried out using cells containing wild-type levels of SSP1 protein and cells over-expressing the protein. These results also demonstrate the capacity of mitochondria to import increased levels of protein in vivo. In vitro import experiments using COVIX-DHFR indicate that purified S. pombe mitochondria can efficiently import this precursor, and that protein translocation is dependent upon an oxidizable substrate and a membrane potential.

Item Type: Article
Schools and Departments: School of Life Sciences > Biochemistry
Depositing User: Anthony Moore
Date Deposited: 06 Feb 2012 20:58
Last Modified: 30 Nov 2012 17:09
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