| http://purl.uniprot.org/citations/20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/20018870 | http://www.w3.org/2000/01/rdf-schema#comment | "Protein kinase D (PKD), a serine/threonine kinase with emerging cardiovascular functions, phosphorylates cardiac troponin I (cTnI) at Ser(22)/Ser(23), reduces myofilament Ca(2+) sensitivity, and accelerates cross-bridge cycle kinetics. Whether PKD regulates cardiac myofilament function entirely through cTnI phosphorylation at Ser(22)/Ser(23) remains to be established. To determine the role of cTnI phosphorylation at Ser(22)/Ser(23) in PKD-mediated regulation of cardiac myofilament function, we used transgenic mice that express cTnI in which Ser(22)/Ser(23) are substituted by nonphosphorylatable Ala (cTnI-Ala(2)). In skinned myocardium from wild-type (WT) mice, PKD increased cTnI phosphorylation at Ser(22)/Ser(23) and decreased the Ca(2+) sensitivity of force. In contrast, PKD had no effect on the Ca(2+) sensitivity of force in myocardium from cTnI-Ala(2) mice, in which Ser(22)/Ser(23) were unavailable for phosphorylation. Surprisingly, PKD accelerated cross-bridge cycle kinetics similarly in myocardium from WT and cTnI-Ala(2) mice. Because cardiac myosin-binding protein C (cMyBP-C) phosphorylation underlies cAMP-dependent protein kinase (PKA)-mediated acceleration of cross-bridge cycle kinetics, we explored whether PKD phosphorylates cMyBP-C at its PKA sites, using recombinant C1C2 fragments with or without site-specific Ser/Ala substitutions. Kinase assays confirmed that PKA phosphorylates Ser(273), Ser(282), and Ser(302), and revealed that PKD phosphorylates only Ser(302). Furthermore, PKD phosphorylated Ser(302) selectively and to a similar extent in native cMyBP-C of skinned myocardium from WT and cTnI-Ala(2) mice, and this phosphorylation occurred throughout the C-zones of sarcomeric A-bands. In conclusion, PKD reduces myofilament Ca(2+) sensitivity through cTnI phosphorylation at Ser(22)/Ser(23) but accelerates cross-bridge cycle kinetics by a distinct mechanism. PKD phosphorylates cMyBP-C at Ser(302), which may mediate the latter effect."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.org/dc/terms/identifier | "doi:10.1074/jbc.m109.066456"xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Gautel M."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Robbins J."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Walker J.W."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Cuello F."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Avkiran M."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Kentish J.C."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Rowland A.J."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Sadayappan S."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/author | "Bardswell S.C."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/date | "2010"xsd:gYear |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/name | "J Biol Chem"xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/pages | "5674-5682"xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/title | "Distinct sarcomeric substrates are responsible for protein kinase D-mediated regulation of cardiac myofilament Ca2+ sensitivity and cross-bridge cycling."xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://purl.uniprot.org/core/volume | "285"xsd:string |
| http://purl.uniprot.org/citations/20018870 | http://www.w3.org/2004/02/skos/core#exactMatch | http://purl.uniprot.org/pubmed/20018870 |
| http://purl.uniprot.org/citations/20018870 | http://xmlns.com/foaf/0.1/primaryTopicOf | https://pubmed.ncbi.nlm.nih.gov/20018870 |
| http://purl.uniprot.org/uniprot/#_E9Q9T8-mappedCitation-20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#object | http://purl.uniprot.org/citations/20018870 |
| http://purl.uniprot.org/uniprot/#_D3Z160-mappedCitation-20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#object | http://purl.uniprot.org/citations/20018870 |
| http://purl.uniprot.org/uniprot/#_D3YXP5-mappedCitation-20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#object | http://purl.uniprot.org/citations/20018870 |
| http://purl.uniprot.org/uniprot/#_A0A140LIV0-mappedCitation-20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#object | http://purl.uniprot.org/citations/20018870 |
| http://purl.uniprot.org/uniprot/#_A9JR55-mappedCitation-20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#object | http://purl.uniprot.org/citations/20018870 |
| http://purl.uniprot.org/uniprot/#_P48787-mappedCitation-20018870 | http://www.w3.org/1999/02/22-rdf-syntax-ns#object | http://purl.uniprot.org/citations/20018870 |