6CXJ

Cardiac thin filament decorated with C0C1 fragment of cardiac myosin binding protein C mode 2


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
  • Primary Citation of Related Structures:  
    6G2T, 6CXJ, 6CXI

  • 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 (NTDs) of MyBP-C can either activate or inhibit thin filaments, but the mechanism of their collective action is poorly understood ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Actin, cytoplasmic 2A, B, C, D, E375Homo sapiensMutation(s): 0 
Gene Names: ACTG1ACTG
UniProt & NIH Common Fund Data Resources
Find proteins for P63261 (Homo sapiens)
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Go to UniProtKB:  P63261
PHAROS:  P63261
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin-binding protein C, cardiac-typeF [auth G], G [auth H], H [auth I], I [auth J], J [auth K], K [auth L]109Homo sapiensMutation(s): 0 
Gene Names: MYBPC3
UniProt & NIH Common Fund Data Resources
Find proteins for Q14896 (Homo sapiens)
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Go to UniProtKB:  Q14896
PHAROS:  Q14896
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin-binding protein C, cardiac-typeL [auth M], M [auth N], N [auth O], O [auth P], P [auth Q]101Homo sapiensMutation(s): 0 
Gene Names: MYBPC3
UniProt & NIH Common Fund Data Resources
Find proteins for Q14896 (Homo sapiens)
Explore Q14896 
Go to UniProtKB:  Q14896
PHAROS:  Q14896
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
TropomyosinQ [auth S], R [auth T], S [auth U], T [auth V]127Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
American Heart AssociationUnited States560851

Revision History  (Full details and data files)

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