6CXI

Cardiac thin filament decorated with C0C1 fragment of cardiac myosin binding protein C mode 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 11 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

N-Terminal Domains of Cardiac Myosin Binding Protein C Cooperatively Activate the Thin Filament.

Risi, C.Belknap, B.Forgacs-Lonart, E.Harris, S.P.Schroder, G.F.White, H.D.Galkin, V.E.

(2018) Structure 26: 1604

  • DOI: 10.1016/j.str.2018.08.007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Muscle contraction relies on interaction between myosin-based thick filaments and actin-based thin filaments. Myosin binding protein C (MyBP-C) is a key regulator of actomyosin interactions. Recent studies established that the N'-terminal domains (NT ...

    Muscle contraction relies on interaction between myosin-based thick filaments and actin-based thin filaments. Myosin binding protein C (MyBP-C) is a key regulator of actomyosin interactions. Recent studies established that the N'-terminal domains (NTDs) of MyBP-C can either activate or inhibit thin filaments, but the mechanism of their collective action is poorly understood. Cardiac MyBP-C (cMyBP-C) harbors an extra NTD, which is absent in skeletal isoforms of MyBP-C, and its role in regulation of cardiac contraction is unknown. Here we show that the first two domains of human cMyPB-C (i.e., C0 and C1) cooperate to activate the thin filament. We demonstrate that C1 interacts with tropomyosin via a positively charged loop and that this interaction, stabilized by the C0 domain, is required for thin filament activation by cMyBP-C. Our data reveal a mechanism by which cMyBP-C can modulate cardiac contraction and demonstrate a function of the C0 domain.


    Organizational Affiliation

    Department of Physiological Sciences, Eastern Virginia Medical School, 700 West Olney Road, Lewis Hall, Room 3126, Norfolk, VA 23507, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin, cytoplasmic 2
A, B, C, D, E
375Homo sapiensMutation(s): 0 
Gene Names: ACTG1 (ACTG)
Find proteins for P63261 (Homo sapiens)
Go to Gene View: ACTG1
Go to UniProtKB:  P63261
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Myosin-binding protein C, cardiac-type
G, H, I, J, K, L
109Homo sapiensMutation(s): 0 
Gene Names: MYBPC3
Find proteins for Q14896 (Homo sapiens)
Go to Gene View: MYBPC3
Go to UniProtKB:  Q14896
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Myosin-binding protein C, cardiac-type
M, N, O, P, Q
101Homo sapiensMutation(s): 0 
Gene Names: MYBPC3
Find proteins for Q14896 (Homo sapiens)
Go to Gene View: MYBPC3
Go to UniProtKB:  Q14896
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Tropomyosin
S, T, U, V
127N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
S, T, U, V
L-PEPTIDE LINKINGC4 H9 N O2

--

Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 11 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
American Heart AssociationUnited States560851

Revision History 

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2018-12-19
    Type: Data collection, Database references, Structure summary