Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A3B 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 144854.14 
• Atom Count: 8199 
• Residue Count: 1268 
• Unique protein chains: 2

2YJE

Oligomeric assembly of actin bound to MRTF-A

• DOI: 10.2210/pdb2YJE/pdb

• Classification: MOTOR PROTEIN
• Organism(s): Oryctolagus cuniculus, Mus musculus
• Expression System: Escherichia coli BL21


• Deposited: 2011-05-19 Released: 2011-07-06 
• Deposition Author(s): Mouilleron, S., Langer, C.A., Guettler, S., McDonald, N.Q., Treisman, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.280 
• R-Value Work: 0.235 

Literature

Structure of a pentavalent G-actin*MRTF-A complex reveals how G-actin controls nucleocytoplasmic shuttling of a transcriptional coactivator.

Mouilleron, S., Langer, C.A., Guettler, S., McDonald, N.Q., Treisman, R.

(2011) Sci Signal 4: ra40-ra40

• PubMed: 21673315 
• DOI: 10.1126/scisignal.2001750
• Primary Citation of Related Structures:  
  2YJF


• PubMed Abstract: 
  

Subcellular localization of the actin-binding transcriptional coactivator MRTF-A is controlled by its interaction with monomeric actin (G-actin). Signal-induced decreases in G-actin concentration reduce MRTF-A nuclear export, leading to its nuclear accumulation, whereas artificial increases in G-actin concentration in resting cells block MRTF-A nuclear import, retaining it in the cytoplasm. This regulation is dependent on three actin-binding RPEL motifs in the regulatory domain of MRTF-A. We describe the structures of pentavalent and trivalent G-actin•RPEL domain complexes. In the pentavalent complex, each RPEL motif and the two intervening spacer sequences bound an actin monomer, forming a compact assembly. In contrast, the trivalent complex lacked the C-terminal spacer- and RPEL-actins, both of which bound only weakly in the pentavalent complex. Cytoplasmic localization of MRTF-A in unstimulated fibroblasts also required binding of G-actin to the spacer sequences. The bipartite MRTF-A nuclear localization sequence was buried in the pentameric assembly, explaining how increases in G-actin concentration prevent nuclear import of MRTF-A. Analyses of the pentavalent and trivalent complexes show how actin loads onto the RPEL domain and reveal a molecular mechanism by which actin can control the activity of one of its binding partners.

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Organizational Affiliation: 

Structural Biology Group, Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3LY, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ACTIN, ALPHA SKELETAL MUSCLE	A, B, C	377	Oryctolagus cuniculus	Mutation(s): 0  Gene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus) Go to Gene View: ACTA1 Go to UniProtKB:  P68135

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
MKL/MYOCARDIN-LIKE PROTEIN 1	M	137	Mus musculus	Mutation(s): 0  Gene Names: Mrtfa (Bsac, Mal, Mkl1)
Find proteins for Q8K4J6 (Mus musculus) Go to UniProtKB:  Q8K4J6

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ATP	A, B, C	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
LAB	A, B, C	LATRUNCULIN B C20 H29 N O5 S NSHPHXHGRHSMIK-JRIKCGFMSA-N
MG	A, B, C	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.1 Å
• R-Value Free: 0.280 
• R-Value Work: 0.235 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 90.935	α = 90.00
b = 90.935	β = 90.00
c = 321.613	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-05-19 
• Released Date: 2011-07-06 
• Deposition Author(s): Mouilleron, S., Langer, C.A., Guettler, S., McDonald, N.Q., Treisman, R.

Revision History 

• Version 1.0: 2011-07-06
  Type: Initial release
• Version 1.1: 2011-11-16
  Type: Database references, Other, Version format compliance
• Version 1.2: 2018-04-11
  Type: Data collection, Database references