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Related Experiment Videos

Evidence for a granule targeting sequence within platelet factor 4.

Nargès El Golli1, Odile Issertial, Jean-Philippe Rosa

  • 1Laboratory of Hemostasis and Thrombosis, Cardiovascular Research Center Inserm Lariboisière, U689-E6 INSERM, IFR139, Université Paris 7, Hôpital Lariboisière, 2 rue Ambroise Paré, 75010 Paris, France.

The Journal of Biological Chemistry
|June 21, 2005
PubMed
Summary

Platelet factor 4 (PF4) granule storage relies on the LIATLKNGRK sequence. A specific motif, LKNG, is critical for targeting chemokines to platelet alpha-granules, suggesting broader relevance for other alpha-granule proteins.

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Area of Science:

  • Cell Biology
  • Hematology
  • Molecular Biology

Background:

  • Platelets secrete proteins from alpha-granules to stop bleeding.
  • Platelet factor 4 (PF4) is a chemokine stored in alpha-granules.
  • Understanding PF4's granule targeting is key to platelet function.

Purpose of the Study:

  • To identify the specific sequence determinants responsible for PF4's alpha-granule targeting.
  • To investigate the role of identified motifs in the targeting of other alpha-granule proteins.

Main Methods:

  • Generated PF4 mutants fused to green fluorescent protein (GFP) using deletions and mutagenesis.
  • Assessed granule targeting in AtT20 cells via colocalization with ACTH.
  • Confirmed targeting in human megakaryocytic Dami cells using colocalization with von Willebrand factor and P-selectin.

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Main Results:

  • The amino acid sequence 41-50 (LIATLKNGRK) was identified as critical for PF4 granule targeting.
  • Deletion of LIATLKNGRK significantly reduced PF4 storage in granules.
  • Further analysis pinpointed the LKNG motif as essential for alpha-granule targeting.
  • LKNG-GFP chimera showed high colocalization with alpha-granule markers in Dami cells.
  • Similar targeting motifs were found in other chemokines, Nap-2 and RANTES.

Conclusions:

  • The LKNG motif is a critical determinant for PF4 alpha-granule targeting.
  • The structural and physicochemical properties of LKNG may be relevant for targeting other chemokines and alpha-granule proteins.
  • This finding advances our understanding of protein trafficking within platelet alpha-granules.