Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 33301.24 
• Atom Count: 2270 
• Residue Count: 297 
• Unique protein chains: 1

1YHV

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

• DOI: 10.2210/pdb1YHV/pdb

• Classification: SIGNALING PROTEIN TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 2 


• Deposited: 2005-01-10 Released: 2005-05-24 
• Deposition Author(s): Lei, M., Robinson, M.A., Harrison, S.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.240 
• R-Value Work: 0.220 

Literature

The Active Conformation of the PAK1 Kinase Domain

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

(2005) Structure 13: 769-778

• PubMed: 15893667 
• DOI: 10.1016/j.str.2005.03.007
• Primary Citation of Related Structures:  
  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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Serine/threonine-protein kinase PAK 1	A	297	Homo sapiens	Mutation(s): 2  Gene Names: PAK1 EC: 2.7.11.1
Find proteins for Q13153 (Homo sapiens) Go to Gene View: PAK1 Go to UniProtKB:  Q13153

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.240 
• R-Value Work: 0.220 
• Space Group: C 2 2 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 51.962	α = 90.00
b = 103.296	β = 90.00
c = 122.876	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
CNS	phasing
CNS	refinement
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-01-10 
• Released Date: 2005-05-24 
• Deposition Author(s): Lei, M., Robinson, M.A., Harrison, S.C.

Revision History 

• Version 1.0: 2005-05-24
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance