1LUF | pdb_00001luf

Crystal Structure of the MuSK Tyrosine Kinase: Insights into Receptor Autoregulation

• PDB DOI: https://doi.org/10.2210/pdb1LUF/pdb

• Classification: TRANSFERASE
• Organism(s): Rattus norvegicus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2002-05-22 Released: 2002-09-11 
• Deposition Author(s): Till, J.H., Becerra, M., Watty, A., Lu, Y., Ma, Y., Neubert, T.A., Burden, S.J., Hubbard, S.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 
  0.246 (Depositor), 0.245 (DCC) 
• R-Value Work: 
  0.231 (Depositor), 0.232 (DCC) 
• R-Value Observed: 
  0.231 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of the MuSK tyrosine kinase: insights into receptor autoregulation.

Till, J.H., Becerra, M., Watty, A., Lu, Y., Ma, Y., Neubert, T.A., Burden, S.J., Hubbard, S.R.

(2002) Structure 10: 1187-1196

• PubMed: 12220490 
• DOI: https://doi.org/10.1016/s0969-2126(02)00814-6
• Primary Citation Related Structures: 
  1LUF


• PubMed Abstract: 
  

  Muscle-specific kinase (MuSK) is a receptor tyrosine kinase expressed selectively in skeletal muscle. During neuromuscular synapse formation, agrin released from motor neurons stimulates MuSK autophosphorylation in the kinase activation loop and in the juxtamembrane region, leading to clustering of acetylcholine receptors. We have determined the crystal structure of the cytoplasmic domain of unphosphorylated MuSK at 2.05 A resolution. The structure reveals an autoinhibited kinase domain in which the activation loop obstructs ATP and substrate binding. Steady-state kinetic analysis demonstrates that autophosphorylation results in a 200-fold increase in k(cat) and a 10-fold decrease in the K(m) for ATP. These studies provide a molecular basis for understanding the regulation of MuSK catalytic activity and suggest that an additional in vivo component may contribute to regulation via the juxtamembrane region.

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Organizational Affiliation: 
• Skirball Institute of Biomolecular Medicine and Department of Pharmacology, New York university School of Medicine, New York, NY 10016, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 38.75 kDa 
• Atom Count: 2,296 
• Modeled Residue Count: 275 
• Deposited Residue Count: 343 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
muscle-specific tyrosine kinase receptor musk	A	343	Rattus norvegicus	Mutation(s): 0  EC: 2.7.1.112 (PDB Primary Data), 2.7.10.1 (UniProt)
UniProt
Find proteins for Q62838 (Rattus norvegicus) Explore Q62838  Go to UniProtKB:  Q62838

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free:  0.246 (Depositor), 0.245 (DCC) 
• R-Value Work:  0.231 (Depositor), 0.232 (DCC) 
• R-Value Observed: 0.231 (Depositor) 

Space Group: I 4

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 146.939	α = 90
b = 146.939	β = 90
c = 39.017	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
CNS	refinement
MADNESS	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-09-11 
Deposition Author(s): Till, J.H., Becerra, M., Watty, A., Lu, Y., Ma, Y., Neubert, T.A., Burden, S.J., Hubbard, S.R.

Revision History  

• Version 1.0: 2002-09-11
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Advisory, Refinement description
• Version 1.4: 2024-02-14
  Changes: Advisory, Data collection, Database references, Refinement description