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The A31P missense mutation in cardiac myosin binding protein C alters protein structure but does not cause haploinsufficiency.

Abstract：

:Mutations in MYBPC3, the gene encoding cardiac myosin binding protein C (cMyBP-C), are a major cause of hypertrophic cardiomyopathy (HCM). While most mutations encode premature stop codons, missense mutations causing single amino acid substitutions are also common. Here we investigated effects of a single proline for alanine substitution at amino acid 31 (A31P) in the C0 domain of cMyBP-C, which was identified as a natural cause of HCM in cats. Results using recombinant proteins showed that the mutation disrupted C0 structure, altered sensitivity to trypsin digestion, and reduced recognition by an antibody that preferentially recognizes N-terminal domains of cMyBP-C. Western blots detecting A31P cMyBP-C in myocardium of cats heterozygous for the mutation showed a reduced amount of A31P mutant protein relative to wild-type cMyBP-C, but the total amount of cMyBP-C was not different in myocardium from cats with or without the A31P mutation indicating altered rates of synthesis/degradation of A31P cMyBP-C. Also, the mutant A31P cMyBP-C was properly localized in cardiac sarcomeres. These results indicate that reduced protein expression (haploinsufficiency) cannot account for effects of the A31P cMyBP-C mutation and instead suggest that the A31P mutation causes HCM through a poison polypeptide mechanism that disrupts cMyBP-C or myocyte function.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

van Dijk SJ,Bezold Kooiker K,Mazzalupo S,Yang Y,Kostyukova AS,Mustacich DJ,Hoye ER,Stern JA,Kittleson MD,Harris SP

doi

10.1016/j.abb.2016.01.006

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

133-40

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(16)30006-6

journal_volume

601

pub_type

杂志文章

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