Semaphorin4F interacts with the synapse-associated protein SAP90/PSD-95.

Abstract:

:Semaphorins are a family of secreted and membrane-associated proteins involved in growth cone guidance during development. Here, we describe the interaction of Semaphorin4F (Sema4F) with the post-synaptic density protein SAP90/PSD-95. Using the yeast two-hybrid system and coprecipitation assays we were able to show an interaction between the extreme C-terminus of Sema4F and the PDZ domains of SAP90/PSD-95. Heterologous coexpression of a chimeric EphrinB1/Semaphorin4F protein with SAP90/PSD-95 in COS cells leads to translocation of SAP90/PSD-95 from the cytosol to the membrane. Deletion analysis shows that this translocation activity of Sema4F is completely dependent on the presence of the last three C-terminal amino acids. In addition, Sema4F immunoreactivity is present in synaptosome fractions and enriched in post-synaptic density fractions. Consistently, in cultured hippocampal neurons, we demonstrate punctate colocalization of Sema4F and SAP90/PSD-95 in dendrites, furthermore we found colocalization of Sema4F with synapsin1 suggesting a synaptic localization. Our data implicate a new functional context for semaphorins at glutamatergic synapses.

journal_name

J Neurochem

authors

Schultze W,Eulenburg V,Lessmann V,Herrmann L,Dittmar T,Gundelfinger ED,Heumann R,Erdmann KS

doi

10.1046/j.1471-4159.2001.00447.x

keywords:

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

482-9

issue

3

eissn

0022-3042

issn

1471-4159

journal_volume

78

pub_type

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