Linked Life Data

7607228

Source:http://linkedlifedata.com/resource/pubmed/id/7607228

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1995-8-17
pubmed:abstractText
Metabolic control analysis was applied to describe the control of mitochondrial oxidative phosphorylation in calcium (approximately 2 microM free calcium) activated saponin-skinned rat musculus soleus fibers oxidizing glutamate and malate. Under these circumstances approximately 80% of mitochondrial active-state respiration was reached due to the activation of ATP turnover by actomyosin ATPase. The flux control coefficients of H(+)-ATPase, adenine-nucleotide translocase, phosphate transporter, NADH:ubiquinone oxidoreductase and cytochrome-c oxidase were determined to be equal to 0.16 +/- 0.08 (n = 6), 0.34 +/- 0.12 (n = 5), 0.08 +/- 0.03 (n = 5), 0.01 +/- 0.006 (n = 4) and 0.09 +/- 0.03 (n = 3) using inhibitor titrations with the specific inhibitors oligomycin, carboxyatractyloside, mersalyl, rotenone and cyanide, respectively, and applying non-linear regression of the entire titration curve. The flux control coefficient of actomyosin ATPase was determined with vanadate to be equal to 0.50 +/- 0.09 (n = 6), measuring independently the vanadate-caused inhibition of fiber respiration and ATP-splitting activity. In contrast to results with isolated rat skeletal muscle mitochondria reconstituted with soluble F1-ATPase the decrease in phosphate concentration from 10 mM to 1 mM only slightly affected the distribution of flux control coefficients. This difference is caused by different kinetic properties of soluble F1-ATPase and actomyosin ATPase. Therefore, phosphate seems to be in skeletal muscle in vivo only a modest modulator of control of oxidative phosphorylation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
230
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
549-54
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Distribution of flux control among the enzymes of mitochondrial oxidative phosphorylation in calcium-activated saponin-skinned rat musculus soleus fibers.
pubmed:affiliation
Neurobiochemisches Labor der Klinik für Neurologie and Institut für Biochemie, Otto-von-Guericke-Universität Magdeburg, Germany.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't