Structural Insight into the Unique Cardiac Myosin Binding Protein-C Motif: A Partially Folded Domain

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 5000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Structural Insight into Unique Cardiac Myosin-binding Protein-C Motif: A PARTIALLY FOLDED DOMAIN.

Howarth, J.W.Ramisetti, S.Nolan, K.Sadayappan, S.Rosevear, P.R.

(2012) J Biol Chem 287: 8254-8262

  • DOI: https://doi.org/10.1074/jbc.M111.309591
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structural role of the unique myosin-binding motif (m-domain) of cardiac myosin-binding protein-C remains unclear. Functionally, the m-domain is thought to directly interact with myosin, whereas phosphorylation of the m-domain has been shown to modulate interactions between myosin and actin. Here we utilized NMR to analyze the structure and dynamics of the m-domain in solution. Our studies reveal that the m-domain is composed of two subdomains, a largely disordered N-terminal portion containing three known phosphorylation sites and a more ordered and folded C-terminal portion. Chemical shift analyses, d(NN)(i, i + 1) NOEs, and (15)N{(1)H} heteronuclear NOE values show that the C-terminal subdomain (residues 315-351) is structured with three well defined helices spanning residues 317-322, 327-335, and 341-348. The tertiary structure was calculated with CS-Rosetta using complete (13)C(α), (13)C(β), (13)C', (15)N, (1)H(α), and (1)H(N) chemical shifts. An ensemble of 20 acceptable structures was selected to represent the C-terminal subdomain that exhibits a novel three-helix bundle fold. The solvent-exposed face of the third helix was found to contain the basic actin-binding motif LK(R/K)XK. In contrast, (15)N{(1)H} heteronuclear NOE values for the N-terminal subdomain are consistent with a more conformationally flexible region. Secondary structure propensity scores indicate two transient helices spanning residues 265-268 and 293-295. The presence of both transient helices is supported by weak sequential d(NN)(i, i + 1) NOEs. Thus, the m-domain consists of an N-terminal subdomain that is flexible and largely disordered and a C-terminal subdomain having a three-helix bundle fold, potentially providing an actin-binding platform.

  • Organizational Affiliation

    Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mybpc3 protein124Mus musculusMutation(s): 0 
Gene Names: Mybpc3
UniProt & NIH Common Fund Data Resources
Find proteins for A9JR55 (Mus musculus)
Explore A9JR55 
Go to UniProtKB:  A9JR55
IMPC:  MGI:102844
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA9JR55
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 5000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-01-11
    Type: Initial release
  • Version 1.1: 2012-03-28
    Changes: Database references