Please use this identifier to cite or link to this item: https://doi.org/10.1152/ajpregu.90815.2008
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dc.titleCytochrome c oxidase is regulated by modulations in protein expression and mitochondrial membrane phospholipid composition in estivating African lungfish
dc.contributor.authorFrick, N.T.
dc.contributor.authorBystriansky, J.S.
dc.contributor.authorIp, Y.K.
dc.contributor.authorChew, S.F.
dc.contributor.authorBallantyne, J.S.
dc.date.accessioned2014-10-27T08:25:24Z
dc.date.available2014-10-27T08:25:24Z
dc.date.issued2010-03
dc.identifier.citationFrick, N.T., Bystriansky, J.S., Ip, Y.K., Chew, S.F., Ballantyne, J.S. (2010-03). Cytochrome c oxidase is regulated by modulations in protein expression and mitochondrial membrane phospholipid composition in estivating African lungfish. American Journal of Physiology - Regulatory Integrative and Comparative Physiology 298 (3) : R608-R616. ScholarBank@NUS Repository. https://doi.org/10.1152/ajpregu.90815.2008
dc.identifier.issn03636119
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/100397
dc.description.abstractWe examined some of the potential mechanisms lungfish (Protopterus dolloi) use to regulate cytochrome c oxidase (CCO), during metabolic depression. CCO activity was reduced by 67% in isolated liver mitochondria of estivating fish. This was likely accomplished, in part, by the 46% reduction in CCO subunit I protein expression in the liver. No change in the mRNA expression levels of CCO subunits I, II, III, and IV were found in the liver, suggesting CCO is under translational regulation; however, in the kidney, messenger limitation may be a factor as the expression of subunits I and II were depressed (∼10-fold) during estivation, suggesting tissue-specific mechanisms of regulation. CCO is influenced by mitochondrial membrane phospholipids, particularly cardiolipin (CL). In P. dolloi, the phospholipid composition of the liver mitochondrial membrane changed during estivation, with a ∼2.3-fold reduction in the amount of CL. Significant positive correlations were found between CCO activity and the amount of CL and phosphatidylethanolamine within the mitochondrial membrane. It appears CCO activity is regulated through multiple mechanisms in P. dolloi, and individual subunits of CCO are regulated independently, and in a tissue-specific manner. It is proposed that altering the amount of CL within the mitochondrial membrane may be a means of regulating CCO activity during metabolical depression in the African lungfish, P. dolloi. © 2010 American Physiological Society.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1152/ajpregu.90815.2008
dc.sourceScopus
dc.subjectCardiolipin
dc.subjectMetabolic depression
dc.subjectmRNA expression
dc.subjectPhosphatidylethanolamine
dc.subjectProtopterus
dc.typeArticle
dc.contributor.departmentBIOLOGICAL SCIENCES
dc.description.doi10.1152/ajpregu.90815.2008
dc.description.sourcetitleAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
dc.description.volume298
dc.description.issue3
dc.description.pageR608-R616
dc.description.codenAJPRD
dc.identifier.isiut000274980000011
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