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. 1977 Nov 15;168(2):307–310. doi: 10.1042/bj1680307

Phosphorylation of the inhibitory subunit of troponin in perfused hearts of mice deficient in phosphorylase kinase. Evidence for the phosphorylation of troponin by adenosine 3':5'-phosphate-dependent protein kinase in vivo.

P J England
PMCID: PMC1183765  PMID: 202266

Abstract

When hearts from control and phosphorylase kinase-deficient (I strain) mice were perfused with 0.1 micrometer-DL-isoprenaline, there was a parallel increase in contraction, cyclic AMP concentration and troponin I phosphorylation. However, there was no increase in phosphorylase a in the I-strain hearts, whereas the control hearts showed a large increase. Assays of I-strain heart extracts showed a normal cyclic AMP-dependent protein kinase activity but no phosphorylase kinase activity. It is concluded that troponin I is phosphorylated in intact hearts by protein kinase and not phosphorylase kinase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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