3DXK image
Deposition Date 2008-07-24
Release Date 2009-07-28
Last Version Date 2023-08-30
Entry Detail
PDB ID:
3DXK
Title:
Structure of Bos Taurus Arp2/3 Complex with Bound Inhibitor CK0944636
Biological Source:
Source Organism:
Bos taurus (Taxon ID: 9913)
Method Details:
Experimental Method:
Resolution:
2.70 Å
R-Value Free:
0.26
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 3
Gene (Uniprot):ACTR3
Chain IDs:A
Chain Length:418
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2
Gene (Uniprot):ACTR2
Chain IDs:B
Chain Length:394
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 1B
Gene (Uniprot):ARPC1B
Chain IDs:C
Chain Length:372
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 2
Gene (Uniprot):ARPC2
Chain IDs:D
Chain Length:300
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 3
Gene (Uniprot):ARPC3
Chain IDs:E
Chain Length:178
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 4
Gene (Uniprot):ARPC4
Chain IDs:F
Chain Length:168
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:Actin-related protein 2/3 complex subunit 5
Gene (Uniprot):ARPC5
Chain IDs:G
Chain Length:151
Number of Molecules:1
Biological Source:Bos taurus
Ligand Molecules
Primary Citation
Characterization of two classes of small molecule inhibitors of Arp2/3 complex
Nature 460 1031 1034 (2009)
PMID: 19648907 DOI: 10.1038/nature08231

Abstact

Polymerization of actin filaments directed by the actin-related protein (Arp)2/3 complex supports many types of cellular movements. However, questions remain regarding the relative contributions of Arp2/3 complex versus other mechanisms of actin filament nucleation to processes such as path finding by neuronal growth cones; this is because of the lack of simple methods to inhibit Arp2/3 complex reversibly in living cells. Here we describe two classes of small molecules that bind to different sites on the Arp2/3 complex and inhibit its ability to nucleate actin filaments. CK-0944636 binds between Arp2 and Arp3, where it appears to block movement of Arp2 and Arp3 into their active conformation. CK-0993548 inserts into the hydrophobic core of Arp3 and alters its conformation. Both classes of compounds inhibit formation of actin filament comet tails by Listeria and podosomes by monocytes. Two inhibitors with different mechanisms of action provide a powerful approach for studying the Arp2/3 complex in living cells.

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Primary Citation of related structures