3M6G

Crystal structure of actin in complex with lobophorolide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Two molecules of lobophorolide cooperate to stabilize an actin dimer using both their "ring" and "tail" region.

Blain, J.C.Mok, Y.F.Kubanek, J.Allingham, J.S.

(2010) Chem.Biol. 17: 802-807

  • DOI: 10.1016/j.chembiol.2010.06.010

  • PubMed Abstract: 
  • Actin filament-disrupting marine macrolides are promising templates from which to design therapeutics against cancer and other diseases that co-opt the actin cytoskeleton. Typically, these macrolides form either a 1:1 or 2:1 actin-macrolide complex w ...

    Actin filament-disrupting marine macrolides are promising templates from which to design therapeutics against cancer and other diseases that co-opt the actin cytoskeleton. Typically, these macrolides form either a 1:1 or 2:1 actin-macrolide complex where their aliphatic side chain, or "tail," has been reported to convey the major determinant of cytotoxicity. We now report the structure of the marine macrolide lobophorolide bound to actin with a unique 2:2 stoichiometry in which two lobophorolide molecules cooperate to form a dimerization interface that is composed entirely of the macrolide "ring" region, and each molecule of lobophorolide interacts with both actin subunits via their ring and tail regions to tether the subunits together. This binding mode imposes multiple barriers against microfilament stability and holds important implications for development of actin-targeting drugs and the evolution of macrolide biosynthetic enzymes.


    Organizational Affiliation

    Department of Biochemistry, Queen's University, Kingston, ON K7L 3N6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin, alpha skeletal muscle
A, B
371Oryctolagus cuniculusGene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

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A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
LO3
Query on LO3

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A, B
(1S,3S,4S,5S,7R,8S,9R,12E,14E,16R,17R,19R)-16-hydroxy-9-{(1S,2S,3S)-2-hydroxy-5-[(2S,4R,6S)-4-methoxy-6-methyltetrahydro-2H-pyran-2-yl]-1,3-dimethylpentyl}-3,5,7,17-tetramethoxy-8,14-dimethyl-11H-spiro[10,23-dioxabicyclo[17.3.1]tricosa-12,14,20-triene-4,2'-oxiran]-11-one
C42 H70 O12
YPLVKLZVFQFTLN-NNZJXHHNSA-N
 Ligand Interaction
CA
Query on CA

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A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 53.932α = 90.00
b = 86.419β = 94.91
c = 100.868γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data collection
PDB_EXTRACTdata extraction
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-03-15 
  • Released Date: 2010-09-08 
  • Deposition Author(s): Allingham, J.S.

Revision History 

  • Version 1.0: 2010-09-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2015-01-28
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Refinement description