Abstract:
:The cytoplasmic domain of the neural cell adhesion molecule (NCAM) contains multiple phosphorylation sites. We report here that in addition to serine and threonine residues a tyrosine of the NCAM180 isoform is phosphorylated as shown by phosphoamino acid analysis. Exchange of the only cytoplasmic tyrosine at position 734 of human NCAM180 (NCAM180-Y734F) to phenylalanine resulted in increased neurite outgrowth of NCAM180-Y734F transfected B35 neuroblastoma cells compared to NCAM180-wt transfectants on poly-L-lysine as substrate. As demonstrated by inhibitor studies the increased neurite outgrowth was due to higher FGF receptor 1 and ERK1 activity in NCAM180-Y734F cells, indicating that tyrosine residue 734 plays a role in signal transduction mediated by the FGF receptor. On an NCAM expressing monolayer of COS-7 cells the Y734F mutation also influences FGF receptor 1 dependent neurite outgrowth, but under these conditions additional mechanisms seem to be responsible for the increased neurite length observed for NCAM180-Y734F transfected cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Diestel S,Laurini C,Traub O,Schmitz Bdoi
10.1016/j.bbrc.2004.07.100subject
Has Abstractpub_date
2004-09-10 00:00:00pages
186-96issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(04)01614-6journal_volume
322pub_type
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