期刊
JOURNAL OF NEUROCHEMISTRY
卷 116, 期 6, 页码 975-983出版社
WILEY
DOI: 10.1111/j.1471-4159.2010.07129.x
关键词
5-hydroxytryptamine; ligand-gated ion channel; post-translational modification
资金
- University of Birmingham Medical School
P>The 5-hydroxytryptamine 3 (5-HT3) receptor is a pentameric ligand-gated ion channel with potential molecular isoforms arising from different subunit combinations and/or different post-translational modifications of the individual subunits. Since N-glycosylation of the 5-HT3A subunit impacts cell surface trafficking, the presence of N-glycosylation of the human (h) 5-HT3B subunit and the influence upon cell membrane expression was investigated. Following transient expression of the h5-HT3B subunit by human embryonic kidney cells (HEK293 cells) stably expressing the h5-HT3A subunit, the N-glycosylation inhibitor tunicamycin reduced the size of the predominant h5-HT3B-immunoreactive protein (similar to 55 kDa reduced to similar to 40 kDa). Disruption of each consensus N-glycosylation sequences in the h5-HT3B subunit (N31S, N75S, N117S, N147S and N182S) resulted in a reduced molecular weight (by similar to 2-4 kDa) of each mutant when expressed by HEK293 cells stably expressing the h5-HT3A subunit. Immunocytochemical studies demonstrated that disruption of each of the N-glycosylation sequences (individually or combined) reduced the expression of the mutant h5-HT3B subunit protein in the cell membrane when co-expressed with the h5-HT3A subunit. The present study has identified utilised N-glycosylation sites of the h5-HT3B subunit and demonstrated that they promote subunit expression in the cell membrane; a prerequisite for 5-HT3 receptor function.
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