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Regulation of alternative pathway activity in plant mitochondria: nonlinear relationship between electron flux and the redox poise of the quinone pool.

Abstract：

:The dependence of respiratory flux via the alternative pathway on the redox poise of the ubiquinone (Q) pool was investigated in soybean cotyledon mitochondria. A marked nonlinear relationship was observed between Q-pool reduction level and O2 uptake via the alternative oxidase. Significant engagement of the alternative pathway was not apparent until Q-pool reduction level reached 35-40% but increased disproportionately on further reduction. Similar results were obtained with electron donation from either Complex 1 or Complex 2. Close agreement was obtained over a range of experimental conditions between the estimated contribution of the alternative pathway to total respiratory flux, as measured with salicylhydroxamic acid, and that predicted from the redox poise of the Q-pool. These results are discussed in terms of existing models of the regulation of respiratory flux via the alternative pathway.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Dry IB,Moore AL,Day DA,Wiskich JT

doi

10.1016/0003-9861(89)90173-2

subject

Has Abstract

pub_date

1989-08-15 00:00:00

pages

148-57

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(89)90173-2

journal_volume

273

pub_type

杂志文章

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