8F8R | pdb_00008f8r

Cryo-EM structure of the free barbed end of F-actin

PDB DOI: https://doi.org/10.2210/pdb8F8R/pdb
EM Map EMD-28934: EMDB EMDataResource

Classification: STRUCTURAL PROTEIN
Organism(s): Oryctolagus cuniculus
Mutation(s): No

Deposited: 2022-11-22 Released: 2023-06-07
Deposition Author(s): Carman, P.J., Barrie, K.R., Dominguez, R.
Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.30 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

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

Literature

Structures of the free and capped ends of the actin filament.

Carman, P.J., Barrie, K.R., Rebowski, G., Dominguez, R.

(2023) Science 380: 1287-1292

PubMed: 37228182 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1126/science.adg6812
Primary Citation Related Structures:
8F8P, 8F8Q, 8F8R, 8F8S, 8F8T

PubMed Abstract:
The barbed and pointed ends of the actin filament (F-actin) are the sites of growth and shrinkage and the targets of capping proteins that block subunit exchange, including CapZ at the barbed end and tropomodulin at the pointed end. We describe cryo-electron microscopy structures of the free and capped ends of F-actin. Terminal subunits at the free barbed end adopt a "flat" F-actin conformation. CapZ binds with minor changes to the barbed end but with major changes to itself. By contrast, subunits at the free pointed end adopt a "twisted" monomeric actin (G-actin) conformation. Tropomodulin binding forces the second subunit into an F-actin conformation. The structures reveal how the ends differ from the middle in F-actin and how these differences control subunit addition, dissociation, capping, and interactions with end-binding proteins.

Organizational Affiliation

Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Macromolecule Content

Total Structure Weight: 297.93 kDa
Atom Count: 20,526
Modeled Residue Count: 2,601
Deposited Residue Count: 2,639
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Actin, alpha skeletal muscle	A, B, C, D, E A, B, C, D, E, F, G	377	Oryctolagus cuniculus	Mutation(s): 0 EC: 3.6.4
UniProt
Find proteins for P68135 (Oryctolagus cuniculus) Explore P68135 Go to UniProtKB: P68135
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P68135
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ADP Query on ADP Download:Ideal Coordinates CCD File SDF format, chain J [auth B] SDF format, chain L [auth C] SDF format, chain N [auth D] SDF format, chain P [auth E] SDF format, chain R [auth F] SDF format, chain T [auth G] SDF format, chain H [auth A] MOL2 format, chain J [auth B] MOL2 format, chain L [auth C] MOL2 format, chain N [auth D] MOL2 format, chain P [auth E] MOL2 format, chain R [auth F] MOL2 format, chain T [auth G] MOL2 format, chain H [auth A] mmCIF format, chain J [auth B] mmCIF format, chain L [auth C] mmCIF format, chain N [auth D] mmCIF format, chain P [auth E] mmCIF format, chain R [auth F] mmCIF format, chain T [auth G] mmCIF format, chain H [auth A]	H [auth A] J [auth B] L [auth C] N [auth D] P [auth E] H [auth A], J [auth B], L [auth C], N [auth D], P [auth E], R [auth F], T [auth G]	ADENOSINE-5'-DIPHOSPHATE C₁₀ H₁₅ N₅ O₁₀ P₂ XTWYTFMLZFPYCI-KQYNXXCUSA-N		Interactions Focus chain H [auth A] Focus chain J [auth B] Focus chain L [auth C] Focus chain N [auth D] Focus chain P [auth E] Focus chain R [auth F] Focus chain T [auth G] Interactions & Density Focus chain H [auth A] Focus chain J [auth B] Focus chain L [auth C] Focus chain N [auth D] Focus chain P [auth E] Focus chain R [auth F] Focus chain T [auth G]
MG Query on MG Download:Ideal Coordinates CCD File SDF format, chain K [auth B] SDF format, chain O [auth D] SDF format, chain S [auth F] SDF format, chain U [auth G] SDF format, chain Q [auth E] SDF format, chain M [auth C] SDF format, chain I [auth A] MOL2 format, chain K [auth B] MOL2 format, chain O [auth D] MOL2 format, chain S [auth F] MOL2 format, chain U [auth G] MOL2 format, chain Q [auth E] MOL2 format, chain M [auth C] MOL2 format, chain I [auth A] mmCIF format, chain K [auth B] mmCIF format, chain O [auth D] mmCIF format, chain S [auth F] mmCIF format, chain U [auth G] mmCIF format, chain Q [auth E] mmCIF format, chain M [auth C] mmCIF format, chain I [auth A]	I [auth A] K [auth B] M [auth C] O [auth D] Q [auth E] I [auth A], K [auth B], M [auth C], O [auth D], Q [auth E], S [auth F], U [auth G]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain I [auth A] Focus chain K [auth B] Focus chain M [auth C] Focus chain O [auth D] Focus chain Q [auth E] Focus chain S [auth F] Focus chain U [auth G] Interactions & Density Focus chain I [auth A] Focus chain K [auth B] Focus chain M [auth C] Focus chain O [auth D] Focus chain Q [auth E] Focus chain S [auth F] Focus chain U [auth G]

Modified Residues 1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
HIC Query on HIC	A, B, C, D, E A, B, C, D, E, F, G	L-PEPTIDE LINKING	C₇ H₁₁ N₃ O₂		HIS

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.30 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487:

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2023-06-07

Deposition Author(s):

Carman, P.J.

Barrie, K.R.

Dominguez, R.

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM073791
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM136511
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)	United States	HL156431