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Respiratory chain network in mitochondria of Candida parapsilosis : ADP/O appraisal of the multiple electron pathways
Author(s) -
Milani Graziela,
Jarmuszkiewicz Wiesl̵awa,
Sluse-Goffart Claudine M.,
Schreiber Angelica Z.,
Vercesi Anibal E.,
Sluse Francis E.
Publication year - 2001
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(01)03060-5
Subject(s) - candida parapsilosis , alternative oxidase , ubiquinol , respiratory chain , mitochondrion , biochemistry , electron transport chain , cytochrome c oxidase , oxidase test , cytochrome , respiration , biology , mitochondrial respiratory chain , cytochrome c , chemistry , coenzyme q – cytochrome c reductase , enzyme , microbiology and biotechnology , botany , antifungal
In this study we demonstrated that mitochondria of Candida parapsilosis contain a constitutive ubiquinol alternative oxidase (AOX) in addition to a classical respiratory chain (CRC) and a parallel respiratory chain (PAR) both terminating by two different cytochrome c oxidases. The C. parapsilosis AOX is characterized by a fungi‐type regulation by GMP (as a stimulator) and linoleic acid (as an inhibitor). Inhibitor screening of the respiratory network by the ADP/O ratio and state 3 respiration determinations showed that (i) oxygen can be reduced by the three terminal oxidases through four paths implying one bypass between CRC and PAR and (ii) the sum of CRC, AOX and PAR capacities is higher than the overall respiration (no additivity) and that their engagement could be progressive according to the redox state of ubiquinone, i.e. first cytochrome pathway, then AOX and finally PAR.