Trk is a calmodulin-binding protein: implications for receptor processing.

Abstract:

:The tyrosine kinase receptors for the neurotrophins (Trk) are a family of transmembrane receptors that regulate the differentiation and survival of different neuronal populations. Neurotrophin binding to Trk leads to the activation of several signalling pathways including a rapid, but moderate, increase in intracellular calcium levels. We have previously described the role of calcium and its sensor protein, calmodulin, in Trk-activated intracellular pathways. Here we demonstrate that calmodulin is able to precipitate TrkA from PC12 cell lysates. Using recombinant GST-fusion proteins containing the complete intracellular domain of TrkA, or fragments of this region, we show that calmodulin binds directly to the C-terminal domain of TrkA in a Ca2+-dependent manner. We have also co-immunoprecipitated endogenous Trk and calmodulin in primary cultures of cortical neurones. Moreover, we provide evidence that calmodulin is involved in the regulation of TrkA processing in PC12 cells. Calmodulin inhibition results in the generation of a TrkA-derived p41 fragment from the cytosolic portion of the protein. This fragment is autophosphorylated in tyrosines and can recruit PLCgamma and Shc adaptor proteins. These results suggest that calmodulin binding to Trk may be important for the regulation of Trk intracellular localization and cleavage.

journal_name

J Neurochem

authors

Llovera M,de Pablo Y,Egea J,Encinas M,Peiró S,Martín-Zanca D,Rocamora N,Comella JX

doi

10.1046/j.1471-4159.2003.02178.x

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

422-33

issue

2

eissn

0022-3042

issn

1471-4159

pii

2178

journal_volume

88

pub_type

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