7MF3 | pdb_00007mf3

Structure of the autoinhibited state of smooth muscle myosin-2

PDB DOI: https://doi.org/10.2210/pdb7MF3/pdb
EM Map EMD-23810: EMDB EMDataResource

Classification: CONTRACTILE PROTEIN
Organism(s): Gallus gallus
Mutation(s): No

Deposited: 2021-04-08 Released: 2022-01-05
Deposition Author(s): Heissler, S.M., Arora, A.S., Billington, N., Sellers, J.R., Chinthalapudi, K.

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.40 Å
Aggregation State: TISSUE
Reconstruction Method: SINGLE PARTICLE

Starting Model: 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 structure of the autoinhibited state of myosin-2.

Heissler, S.M., Arora, A.S., Billington, N., Sellers, J.R., Chinthalapudi, K.

(2021) Sci Adv 7: eabk3273-eabk3273

PubMed: 34936462 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1126/sciadv.abk3273
Primary Citation Related Structures:
7MF3

PubMed Abstract:
We solved the near-atomic resolution structure of smooth muscle myosin-2 in the autoinhibited state (10 S ) using single-particle cryo–electron microscopy. The 3.4-Å structure reveals the precise molecular architecture of 10 S and the structural basis for myosin-2 regulation. We reveal the position of the phosphorylation sites that control myosin autoinhibition and activation by phosphorylation of the regulatory light chain. Further, we present a previously unidentified conformational state in myosin-2 that traps ADP and P _i produced by the hydrolysis of ATP in the active site. This noncanonical state represents a branch of the myosin enzyme cycle and explains the autoinhibition of the enzyme function of 10 S along with its reduced affinity for actin. Together, our structure defines the molecular mechanisms that drive 10 S formation, stabilization, and relief by phosphorylation of the regulatory light chain.

Organizational Affiliation

Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA.

Macromolecule Content

Total Structure Weight: 990.45 kDa
Atom Count: 22,938
Modeled Residue Count: 2,822
Deposited Residue Count: 8,554
Unique protein chains: 3

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin-11	A, B, G, H	1,978	Gallus gallus	Mutation(s): 0
UniProt
Find proteins for P10587 (Gallus gallus) Explore P10587 Go to UniProtKB: P10587
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P10587
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin light polypeptide 6	C, F	150	Gallus gallus	Mutation(s): 0
UniProt
Find proteins for P02607 (Gallus gallus) Explore P02607 Go to UniProtKB: P02607
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P02607
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 2, smooth muscle major isoform	D, E	171	Gallus gallus	Mutation(s): 0
UniProt
Find proteins for P02612 (Gallus gallus) Explore P02612 Go to UniProtKB: P02612
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P02612
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ADP Query on ADP Download:Ideal Coordinates CCD File SDF format, chain L [auth B] SDF format, chain I [auth A] MOL2 format, chain L [auth B] MOL2 format, chain I [auth A] mmCIF format, chain L [auth B] mmCIF format, chain I [auth A]	I [auth A], L [auth B]	ADENOSINE-5'-DIPHOSPHATE C₁₀ H₁₅ N₅ O₁₀ P₂ XTWYTFMLZFPYCI-KQYNXXCUSA-N		Interactions Focus chain I [auth A] Focus chain L [auth B] Interactions & Density Focus chain I [auth A] Focus chain L [auth B]
PO4 Query on PO4 Download:Ideal Coordinates CCD File SDF format, chain M [auth B] SDF format, chain J [auth A] MOL2 format, chain M [auth B] MOL2 format, chain J [auth A] mmCIF format, chain M [auth B] mmCIF format, chain J [auth A]	J [auth A], M [auth B]	PHOSPHATE ION O₄ P NBIIXXVUZAFLBC-UHFFFAOYSA-K		Interactions Focus chain J [auth A] Focus chain M [auth B] Interactions & Density Focus chain J [auth A] Focus chain M [auth B]
MG Query on MG Download:Ideal Coordinates CCD File SDF format, chain P [auth E] SDF format, chain O [auth D] SDF format, chain N [auth B] SDF format, chain K [auth A] MOL2 format, chain P [auth E] MOL2 format, chain O [auth D] MOL2 format, chain N [auth B] MOL2 format, chain K [auth A] mmCIF format, chain P [auth E] mmCIF format, chain O [auth D] mmCIF format, chain N [auth B] mmCIF format, chain K [auth A]	K [auth A], N [auth B], O [auth D], P [auth E]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain K [auth A] Focus chain N [auth B] Focus chain O [auth D] Focus chain P [auth E] Interactions & Density Focus chain K [auth A] Focus chain N [auth B] Focus chain O [auth D] Focus chain P [auth E]