Publication

The GPIb alpha-thrombin interaction: far from crystal clear

Vanhoorelbeke, K., Ulrichts, H., Romijn, RA., Huizinga, EG. & Deckmyn, H., Jan-2004, In : TRENDS IN MOLECULAR MEDICINE. 10, 1, p. 33-39 7 p.

Research output: Contribution to journalReview articleAcademicpeer-review

  • K Vanhoorelbeke
  • H Ulrichts
  • RA Romijn
  • EG Huizinga
  • H Deckmyn

The interaction of thrombin with platelet glycoprotein (GP)-Ibalpha has been well demonstrated. However, recent data have provided new insights into the GPIb-thrombin interaction. GPIb-clustering, which seems to be required for signal transduction, might be achieved by removal of GPV from the complex. In addition, the GPIbalpha subunits might need to be relatively mobile, as would occur in rafts or with GPIbalpha that has dissociated from the cytoskeleton. Finally, by resolving the crystal structures, two groups have identified different interaction sites in both thrombin and GPIba that could be involved in cross-linking. Our direct comparison of the two structures reveals that, whereas one thrombin molecule binds to exactly the same site in GPIbalpha in both crystals, the other does not. Nevertheless, present biochemical and structural data complement each other well and help to clarify how GPIb might facilitate platelet activation by thrombin.

Original languageEnglish
Pages (from-to)33-39
Number of pages7
JournalTRENDS IN MOLECULAR MEDICINE
Volume10
Issue number1
Publication statusPublished - Jan-2004

    Keywords

  • PLATELET GLYCOPROTEIN-IB, VON-WILLEBRAND-FACTOR, IX-V COMPLEX, PROTEASE-ACTIVATED RECEPTORS, PRO-ARG CHLOROMETHYLKETONE, BINDING-SITE, RECOMBINANT HIRUDIN, TYROSINE SULFATION, AGGREGATION, IDENTIFICATION

ID: 4168153