6YW7

Cryo-EM structure of the ARP2/3 1A5C isoform complex.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Cryo-EM of human Arp2/3 complexes provides structural insights into actin nucleation modulation by ARPC5 isoforms.

von Loeffelholz, O.Purkiss, A.Cao, L.Kjaer, S.Kogata, N.Romet-Lemonne, G.Way, M.Moores, C.A.

(2020) Biol Open 9

  • DOI: 10.1242/bio.054304
  • Primary Citation of Related Structures:  
    6YW7, 6YW6

  • PubMed Abstract: 
  • The Arp2/3 complex regulates many cellular processes by stimulating formation of branched actin filament networks. Because three of its seven subunits exist as two different isoforms, mammals produce a family of Arp2/3 complexes with different properties ...

    The Arp2/3 complex regulates many cellular processes by stimulating formation of branched actin filament networks. Because three of its seven subunits exist as two different isoforms, mammals produce a family of Arp2/3 complexes with different properties that may be suited to different physiological contexts. To shed light on how isoform diversification affects Arp2/3 function, we determined a 4.2 Å resolution cryo-EM structure of the most active human Arp2/3 complex containing ARPC1B and ARPC5L, and compared it with the structure of the least active ARPC1A-ARPC5-containing complex. The architecture of each isoform-specific Arp2/3 complex is the same. Strikingly, however, the N-terminal half of ARPC5L is partially disordered compared to ARPC5, suggesting that this region of ARPC5/ARPC5L is an important determinant of complex activity. Confirming this idea, the nucleation activity of Arp2/3 complexes containing hybrid ARPC5/ARPC5L subunits is higher when the ARPC5L N-terminus is present, thereby providing insight into activity differences between the different Arp2/3 complexes.


    Organizational Affiliation

    Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, London WC1E 7HX, UK michael.way@crick.ac.uk c.moores@mail.cryst.bbk.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 3 A418Homo sapiensMutation(s): 0 
Gene Names: ACTR3ARP3
Find proteins for P61158 (Homo sapiens)
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PHAROS:  P61158
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 2 D300Homo sapiensMutation(s): 0 
Gene Names: ARPC2ARC34PRO2446
Find proteins for O15144 (Homo sapiens)
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PHAROS:  O15144
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 3 E178Homo sapiensMutation(s): 0 
Gene Names: ARPC3ARC21
Find proteins for O15145 (Homo sapiens)
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PHAROS:  O15145
Protein Feature View
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2 B394Homo sapiensMutation(s): 0 
Gene Names: ACTR2ARP2
Find proteins for P61160 (Homo sapiens)
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PHAROS:  P61160
Protein Feature View
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 4 F168Homo sapiensMutation(s): 0 
Gene Names: ARPC4ARC20
Find proteins for P59998 (Homo sapiens)
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PHAROS:  P59998
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 5 G151Homo sapiensMutation(s): 0 
Gene Names: ARPC5ARC16
Find proteins for O15511 (Homo sapiens)
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PHAROS:  O15511
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Actin-related protein 2/3 complex subunit 1A C370Homo sapiensMutation(s): 0 
Gene Names: ARPC1ASOP2L
Find proteins for Q92747 (Homo sapiens)
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PHAROS:  Q92747
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/L00190X/1

Revision History 

  • Version 1.0: 2020-07-22
    Type: Initial release
  • Version 1.1: 2020-08-12
    Changes: Database references