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. 2006 Mar 31;342(1):316-22.
doi: 10.1016/j.bbrc.2006.01.126. Epub 2006 Feb 3.

Formation of signal transduction complexes during immobile phase of NGFR movements

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Formation of signal transduction complexes during immobile phase of NGFR movements

Sho C Shibata et al. Biochem Biophys Res Commun. .

Abstract

Nerve growth factor (NGF) is a secreted neurotrophin involved in the differentiation, growth, and maintenance of neurons. Here, we have used single-molecule imaging to characterize the behavior of Cy3-tagged NGF after binding to receptor complexes on the surfaces of PC12 cells. We show that NGF-receptor complexes have two distinct diffusive states, characterized as mobile and immobile phase. The transition between the two diffusive states occurred reversibly with duration times determined by a single rate limiting process. The abrupt transition to the immobile phase often occurred simultaneously with the clustering of NGF-receptor complexes. Immobilization depended on the phosphorylation of the TrkA NGF-receptor. Using dual-color imaging, it was demonstrated that the membrane recruitment of the intercellular signaling protein occurs with NGF-receptor complexes in the immobile phase indicating signal transduction occurs during this phase. Thus, NGF signaling is performed through a repetitive random process to induce transient formation of signaling complexes.

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