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Phosphoregulation of sorting signal-VHS domain interactions by a direct electrostatic mechanism.

Phosphorylation of the cytosolic tails of transmembrane receptors can regulate their intracellular trafficking. The structural basis for such regulation, however, has not been explained in most cases. The cytosolic tail of the cation-independent mannose 6-phosphate receptor contains a serine residue within an acidic-cluster dileucine signal that is important for the function of the receptor in the biosynthetic sorting of lysosomal hydrolases. We show here that phosphorylation of this Ser enhances interactions of the signal with its recognition module, the VHS domain of the GGA proteins. Crystallographic analyses demonstrate that the phosphoserine residue interacts electrostatically with two basic residues on the VHS domain of GGA3, thus providing an additional point of attachment of the acidic-cluster dileucine signal to its recognition module.

Pubmed ID: 12032548


  • Kato Y
  • Misra S
  • Puertollano R
  • Hurley JH
  • Bonifacino JS


Nature structural biology

Publication Data

July 24, 2002

Associated Grants


Mesh Terms

  • ADP-Ribosylation Factors
  • Adaptor Proteins, Vesicular Transport
  • Amino Acid Sequence
  • Binding Sites
  • Carrier Proteins
  • Crystallography, X-Ray
  • Humans
  • Models, Molecular
  • Molecular Sequence Data
  • Phosphorylation
  • Phosphoserine
  • Protein Binding
  • Protein Structure, Tertiary
  • Protein Transport
  • Receptor, IGF Type 2
  • Recombinant Fusion Proteins
  • Static Electricity
  • Two-Hybrid System Techniques