9YR7 | pdb_00009yr7

Cryo-EM structure of human beta-cardiac myosin bound to mavacamten in the interacting-heads motif and S2-FH undocked state

PDB DOI: https://doi.org/10.2210/pdb9YR7/pdb
EM Map EMD-73362: EMDB EMDataResource

Classification: CONTRACTILE PROTEIN
Organism(s): Homo sapiens, Saccharomyces cerevisiae, Aequorea victoria, Mus musculus
Expression System: Mus musculus
Mutation(s): Yes

Deposited: 2025-10-16 Released: 2026-04-08
Deposition Author(s): Somavarapu, A.K., Ge, J., Yengo, C.M., Craig, R., Padron, R.
Funding Organization(s): National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI), National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.00 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

Starting Models: experimental
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wwPDB Validation 3D Report Full Report

This is version 1.1 of the entry. See complete history.

Literature

Cryo-EM reveals how cardiomyopathy therapeutic drugs modulate the myosin motors of the heart.

Somavarapu, A.K., Ge, J., Yengo, C.M., Craig, R., Padron, R.

(2026) Sci Adv 12: eaed6472-eaed6472

PubMed: 42054467 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1126/sciadv.aed6472
Primary Citation Related Structures:
9YOP, 9YP4, 9YP9, 9YR7, 9YRG, 9YRH

PubMed Abstract:
Genetic mutations in myosin, the motor protein that powers the heartbeat, are linked to inherited hypertrophic and dilated cardiomyopathies. Mavacamten and omecamtiv mecarbil are therapeutic, myosin-targeted drugs designed to treat these myopathies, but their mechanism of action has remained unclear. Using single-particle cryo-EM, we determined near-atomic resolution structures of wild-type, mavacamten-bound, and omecamtiv mecarbil-bound myosin molecules. Across all conditions, we observe two distinct, alternate conformations of myosin, not previously reported. We show how mavacamten stabilizes one conformation by reinforcing key electrostatic interfaces in the molecule, whereas omecamtiv mecarbil weakens these interfaces, favoring the second structure. This remodeling elucidates previously unclear allosteric mechanisms through which these drugs either inhibit or enhance myosin activity, countering the deleterious impacts of disease. These findings reveal how drugs modulate myosin structure to control cardiac contractility.

Organizational Affiliation

Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Chan Medical School, Worcester, MA, USA.

Macromolecule Content

Total Structure Weight: 382.1 kDa
Atom Count: 19,808
Modeled Residue Count: 2,454
Deposited Residue Count: 3,344
Unique protein chains: 3

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin-7,General control transcription factor GCN4,Enhanced Green fluorescent protein	A, B	1,315	Homo sapiens, Saccharomyces cerevisiae, Aequorea victoria This entity is chimeric	Mutation(s): 4 Gene Names: MYH7, MYHCB, GCN4, AAS101, AAS3, ARG9, YEL009C, GFP
UniProt & NIH Common Fund Data Resources
Find proteins for P03069 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P03069 Go to UniProtKB: P03069
Find proteins for P12883 (Homo sapiens) Explore P12883 Go to UniProtKB: P12883
PHAROS: P12883 GTEx: ENSG00000092054
Find proteins for P42212 (Aequorea victoria) Explore P42212 Go to UniProtKB: P42212
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Groups	P12883 P42212 P03069
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin light chain 1/3, skeletal muscle isoform	C, D	188	Mus musculus	Mutation(s): 0
UniProt
Find proteins for P05977 (Mus musculus) Explore P05977 Go to UniProtKB: P05977
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P05977
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin regulatory light chain 11	E, F	169	Mus musculus	Mutation(s): 0
UniProt
Find proteins for P97457 (Mus musculus) Explore P97457 Go to UniProtKB: P97457
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P97457
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ADP (Subject of Investigation/LOI) Query on ADP Download:Ideal Coordinates CCD File SDF format, chain H [auth A] SDF format, chain K [auth B] MOL2 format, chain H [auth A] MOL2 format, chain K [auth B] mmCIF format, chain H [auth A] mmCIF format, chain K [auth B]	H [auth A], K [auth B]	ADENOSINE-5'-DIPHOSPHATE C₁₀ H₁₅ N₅ O₁₀ P₂ XTWYTFMLZFPYCI-KQYNXXCUSA-N		Interactions Focus chain H [auth A] Focus chain K [auth B] Interactions & Density Focus chain H [auth A] Focus chain K [auth B]
XB2 (Subject of Investigation/LOI) Query on XB2 Download:Ideal Coordinates CCD File SDF format, chain G [auth A] SDF format, chain J [auth B] MOL2 format, chain G [auth A] MOL2 format, chain J [auth B] mmCIF format, chain G [auth A] mmCIF format, chain J [auth B]	G [auth A], J [auth B]	Mavacamten C₁₅ H₁₉ N₃ O₂ RLCLASQCAPXVLM-NSHDSACASA-N		Interactions Focus chain G [auth A] Focus chain J [auth B] Interactions & Density Focus chain G [auth A] Focus chain J [auth B]
PO4 (Subject of Investigation/LOI) Query on PO4 Download:Ideal Coordinates CCD File SDF format, chain I [auth A] SDF format, chain L [auth B] MOL2 format, chain I [auth A] MOL2 format, chain L [auth B] mmCIF format, chain I [auth A] mmCIF format, chain L [auth B]	I [auth A], L [auth B]	PHOSPHATE ION O₄ P NBIIXXVUZAFLBC-UHFFFAOYSA-K		Interactions Focus chain I [auth A] Focus chain L [auth B] Interactions & Density Focus chain I [auth A] Focus chain L [auth B]

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.00 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487:
MODEL REFINEMENT	PHENIX	1.20.1_4487:
RECONSTRUCTION	cryoSPARC

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-04-08

Deposition Author(s):

Funding Organization	Location	Grant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)	United States	HL164560
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)	United States	AR081941