7UDT

cryo-EM structure of the rigor state wild type myosin-15-F-actin complex (symmetry expansion and re-centering)

• PDB DOI:  https://doi.org/10.2210/pdb7UDT/pdb
• EM Map EMD-26459: EMDB EMDataResource

• Classification: MOTOR PROTEIN
• Organism(s): Gallus gallus, Mus musculus
• Expression System: Insect cell expression vector pTIE1
• Mutation(s): No 


• Deposited: 2022-03-20 Released: 2022-08-03 
• Deposition Author(s): Gong, R., Reynolds, M.J., Alushin, G.M.
• Funding Organization(s): National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Institute on Deafness and Other Communication Disorders (NIH/NIDCD)

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.17 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural basis for tunable control of actin dynamics by myosin-15 in mechanosensory stereocilia.

Gong, R., Jiang, F., Moreland, Z.G., Reynolds, M.J., de Los Reyes, S.E., Gurel, P., Shams, A., Heidings, J.B., Bowl, M.R., Bird, J.E., Alushin, G.M.

(2022) Sci Adv 8: eabl4733-eabl4733

• PubMed: 35857845 
• DOI: https://doi.org/10.1126/sciadv.abl4733
• Primary Citation of Related Structures:  
  7R8V, 7R91, 7RB8, 7RB9, 7UDT, 7UDU


• PubMed Abstract: 
  

The motor protein myosin-15 is necessary for the development and maintenance of mechanosensory stereocilia, and mutations in myosin-15 cause hereditary deafness. In addition to transporting actin regulatory machinery to stereocilia tips, myosin-15 directly nucleates actin filament ("F-actin") assembly, which is disrupted by a progressive hearing loss mutation (p.D1647G, " jordan "). Here, we present cryo-electron microscopy structures of myosin-15 bound to F-actin, providing a framework for interpreting the impacts of deafness mutations on motor activity and actin nucleation. Rigor myosin-15 evokes conformational changes in F-actin yet maintains flexibility in actin's D-loop, which mediates inter-subunit contacts, while the jordan mutant locks the D-loop in a single conformation. Adenosine diphosphate-bound myosin-15 also locks the D-loop, which correspondingly blunts actin-polymerization stimulation. We propose myosin-15 enhances polymerization by bridging actin protomers, regulating nucleation efficiency by modulating actin's structural plasticity in a myosin nucleotide state-dependent manner. This tunable regulation of actin polymerization could be harnessed to precisely control stereocilium height.

---

Organizational Affiliation: 

Laboratory of Structural Biophysics and Mechanobiology, The Rockefeller University, New York, NY, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A3B1C1 Local Symmetry: Helical - H  (3D View)
Local Stoichiometry: Homo 3-mer - A3 

Local Symmetry: Helical - H  (3D View)
Local Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content

• Total Structure Weight: 225.58 kDa 
• Atom Count: 15,806 
• Modelled Residue Count: 1,966 
• Deposited Residue Count: 1,984 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
regulatory light chain	A [auth G]	146	Gallus gallus	Mutation(s): 0
UniProt
Find proteins for P24032 (Gallus gallus) Explore P24032  Go to UniProtKB:  P24032

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Actin, alpha skeletal muscle	B [auth A], C [auth B], D [auth C]	373	Gallus gallus	Mutation(s): 0  Gene Names: ACTA1, ACTA
UniProt
Find proteins for P68139 (Gallus gallus) Explore P68139  Go to UniProtKB:  P68139

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Unconventional myosin-XV	E [auth D]	719	Mus musculus	Mutation(s): 0  Gene Names: Myo15a, Myo15
UniProt & NIH Common Fund Data Resources
Find proteins for Q9QZZ4 (Mus musculus) Explore Q9QZZ4  Go to UniProtKB:  Q9QZZ4
IMPC:  MGI:1261811

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP (Subject of Investigation/LOI)	F [auth A], H [auth B], J [auth C]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG (Subject of Investigation/LOI)	G [auth A], I [auth B], K [auth C]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
HIC	B [auth A], C [auth B], D [auth C]	L-PEPTIDE LINKING	C7 H11 N3 O2		HIS

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.17 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX
RECONSTRUCTION	RELION	3.0

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2022-08-03 
Deposition Author(s): Gong, R., Reynolds, M.J., Alushin, G.M.

---

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR)	United States	DP5OD017885
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM141044
National Institutes of Health/National Institute on Deafness and Other Communication Disorders (NIH/NIDCD)	United States	R01DC018827

Revision History  

• Version 1.0: 2022-08-03
  Type: Initial release