Linked Life Data

17092484

Source:http://linkedlifedata.com/resource/pubmed/id/17092484

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2006-11-19
pubmed:abstractText
Triadin in the junctional sarcoplasmic reticulum (SR) of skeletal muscle cells has been suggested to interact with ryanodine receptor 1 (RYR1) via its KEKE motifs. Recently, we showed that amino acid residues D4878, D4907, and E4908 in RYR1 are critical for triadin-binding in vitro [J.M. Lee, S.H. Rho, D.W. Shin, C. Cho, W.J. Park, S.H. Eom, J. Ma, D.H. Kim, Negatively charged amino acids within the intraluminal loop of ryanodine receptor are involved in the interaction with triadin, J. Biol. Chem. 279 (2004) 6994-7000]. In order to test whether a disruption of the triadin-binding site(s) in RYR1 affects SR Ca(2+) release, alanine-substituted single (D4878A, D4907A, and E4908A) and triple (RYR1-TM) mutants of D4878, D4907, and E4908 were expressed in RYR1-null myotubes. Co-immunoprecipitation experiments showed a 50-60% decrease of triadin brought down in the D4907A and RYR1-TM complexes compared to the triadin-wtRYR1 complex. Ca(2+) imaging experiments using Fluo-4-AM showed atypical caffeine responses in myotubes expressing D4907A and RYR1-TM characterized by either a lack of or slower activation and faster inactivation of Ca(2+) transients. The results suggest that disruption of interaction between triadin and RYR1 impairs RYR1 function and SR Ca(2+) release.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0006-291X
pubmed:author
pubmed:issnType
Print
pubmed:day
29
pubmed:volume
351
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
909-14
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Occurrence of atypical Ca2+ transients in triadin-binding deficient-RYR1 mutants.
pubmed:affiliation
Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul 137-701, South Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural