title: Peptide probe study of the critical regulatory domain of the cardiac ryanodine receptor.
abstract: The recently devised domain peptide probe technique was used to identify and characterize critical domains of the cardiac ryanodine receptor (RyR2). A synthetic peptide corresponding to the Gly(2460)-Pro(2495) domain of the RyR2, designated DPc10, enhanced the ryanodine binding activity and increased the sensitivity of the RyR2 to activating Ca(2+): the effects that resemble the typical phenotypes of cardiac diseases. A single Arg-to-Ser mutation made in DPc10, mimicking the recently reported Arg(2474)-to-Ser(2474) human mutation, abolished all of these effects that would have been produced by DPc10. On the basis of the principle of the domain peptide probe approach (see Model 1), these results indicate that the in vivo RyR2 domain corresponding to DPc10 plays a key role in the cardiac channel regulation and in the pathogenic mechanism. This domain peptide approach opens the new possibility in the studies of the regulatory and pathogenic mechanisms of the cardiac Ca(2+) channel.
authors.affiliation: Boston Biomedical Research Institute, Watertown, Massachusetts 02472, USA.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Noriaki
authors.initials: N
authors.lastname: Ikemoto
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D009202:Cardiomyopathies / Q000235:genetics; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D008861:Microsomes / Q000378:metabolism; D008954:Models, Biological; D008969:Molecular Sequence Data; D009206:Myocardium / Q000378:metabolism*; D010446:Peptide Fragments / Q000378:metabolism*; D010455:Peptides / Q000378:metabolism*; D011107:Polylysine / Q000378:metabolism; D011110:Polymorphism, Genetic; D017434:Protein Structure, Tertiary; D012433:Ryanodine / Q000378:metabolism; D019837:Ryanodine Receptor Calcium Release Channel / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D012519:Sarcoplasmic Reticulum / Q000378:metabolism
chemical_list: D010446:Peptide Fragments; D010455:Peptides; D019837:Ryanodine Receptor Calcium Release Channel; C451409:ryanodine receptor calcium release channel (2460-2495), Ser(2474)-; C451408:ryanodine receptor calcium release channel (2460-2495), synthetic; D012433:Ryanodine; D011107:Polylysine; D002118:Calcium