6CXI

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 11.0 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
  • Structures With Same Primary Citation

  • 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. Electronic address: galkinve@evms.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin, cytoplasmic 2A, B, C, D, E375Homo sapiensMutation(s): 0 
Gene Names: ACTG1ACTG
Find proteins for P63261 (Homo sapiens)
Explore P63261 
Go to UniProtKB:  P63261
NIH Common Fund Data Resources
PHAROS  P63261
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Myosin-binding protein C, cardiac-typeG, H, I, J, K, L109Homo sapiensMutation(s): 0 
Gene Names: MYBPC3
Find proteins for Q14896 (Homo sapiens)
Explore Q14896 
Go to UniProtKB:  Q14896
NIH Common Fund Data Resources
PHAROS  Q14896
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Myosin-binding protein C, cardiac-typeM, N, O, P, Q101Homo sapiensMutation(s): 0 
Gene Names: MYBPC3
Find proteins for Q14896 (Homo sapiens)
Explore Q14896 
Go to UniProtKB:  Q14896
NIH Common Fund Data Resources
PHAROS  Q14896
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
TropomyosinS, T, U, V127Homo sapiensMutation(s): 0 
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 11.0 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



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
    Changes: Data collection, Database references, Structure summary