Crystal Structure of PAK1 kinase domain with two point mutations (K299R, T423E)

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.223 

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The Active Conformation of the PAK1 Kinase Domain

Lei, M.Robinson, M.A.Harrison, S.C.

(2005) Structure 13: 769-778

  • DOI: https://doi.org/10.1016/j.str.2005.03.007
  • Primary Citation of Related Structures:  
    1YHV, 1YHW

  • PubMed Abstract: 

    The p21-activated kinases (PAKs) participate in cytoskeletal control networks, downstream of Rho-family GTPases. A structure of PAK1 in an autoregulated, "off" state showed that a regulatory region, N-terminal to the kinase domain, forces the latter into an inactive conformation, prevents phosphorylation of Thr423 in the activation loop, and promotes dimerization. We have now determined structures at 1.8 A resolution for the free PAK1 kinase domain, with a mutation in the active site that blocks enzymatic activity, and for the same domain with a "phosphomimetic" mutation in the activation loop. The two very similar structures show that even in the absence of a phosphorylated Thr423, the kinase has an essentially active conformation. When Cdc42 binds the regulatory region and dissociates the dimer, PAK1 will be in an "intermediate-active" state, with a capacity to phosphorylate itself or other substrates even prior to modification of its activation loop.

  • Organizational Affiliation

    Laboratory of Molecular Medicine, Children's Hospital, 320 Longwood Avenue, Boston, Massachusetts 02115, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase PAK 1297Homo sapiensMutation(s): 2 
Gene Names: PAK1
UniProt & NIH Common Fund Data Resources
Find proteins for Q13153 (Homo sapiens)
Explore Q13153 
Go to UniProtKB:  Q13153
PHAROS:  Q13153
GTEx:  ENSG00000149269 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13153
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.223 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.962α = 90
b = 103.296β = 90
c = 122.876γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references
  • Version 1.4: 2024-02-14
    Changes: Data collection