Büttner, C. ; Sadtler, S. ; Leyendecker, A. ; Laube, Bodo ; Griffon, N. ; Betz, H. ; Schmalzing, G. (2001)
Ubiquitination precedes internalization and proteolytic cleavage of plasma membrane-bound glycine receptors.
In: The Journal of biological chemistry, 276 (46)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The inhibitory glycine receptor (GlyR) in developing spinal neurones is internalized efficiently upon antagonist inhibition. Here we used surface labeling combined with affinity purification to show that homopentameric alpha1 GlyRs generated in Xenopus oocytes are proteolytically nicked into fragments of 35 and 13 kDa upon prolonged incubation. Nicked GlyRs do not exist at the cell surface, indicating that proteolysis occurs exclusively in the endocytotic pathway. Consistent with this interpretation, elevation of the lysosomal pH, but not the proteasome inhibitor lactacystin, prevents GlyR cleavage. Prior to internalization, alpha1 GlyRs are conjugated extensively with ubiquitin in the plasma membrane. Our results are consistent with ubiquitination regulating the endocytosis and subsequent proteolysis of GlyRs residing in the plasma membrane. Ubiquitin-conjugating enzymes thus may have a crucial role in synaptic plasticity by determining postsynaptic receptor numbers.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2001 |
| Autor(en): | Büttner, C. ; Sadtler, S. ; Leyendecker, A. ; Laube, Bodo ; Griffon, N. ; Betz, H. ; Schmalzing, G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Ubiquitination precedes internalization and proteolytic cleavage of plasma membrane-bound glycine receptors. |
| Sprache: | Englisch |
| Publikationsjahr: | 2001 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of biological chemistry |
| Jahrgang/Volume einer Zeitschrift: | 276 |
| (Heft-)Nummer: | 46 |
| Kurzbeschreibung (Abstract): | The inhibitory glycine receptor (GlyR) in developing spinal neurones is internalized efficiently upon antagonist inhibition. Here we used surface labeling combined with affinity purification to show that homopentameric alpha1 GlyRs generated in Xenopus oocytes are proteolytically nicked into fragments of 35 and 13 kDa upon prolonged incubation. Nicked GlyRs do not exist at the cell surface, indicating that proteolysis occurs exclusively in the endocytotic pathway. Consistent with this interpretation, elevation of the lysosomal pH, but not the proteasome inhibitor lactacystin, prevents GlyR cleavage. Prior to internalization, alpha1 GlyRs are conjugated extensively with ubiquitin in the plasma membrane. Our results are consistent with ubiquitination regulating the endocytosis and subsequent proteolysis of GlyRs residing in the plasma membrane. Ubiquitin-conjugating enzymes thus may have a crucial role in synaptic plasticity by determining postsynaptic receptor numbers. |
| Fachbereich(e)/-gebiet(e): | 10 Fachbereich Biologie 10 Fachbereich Biologie > Neurophysiologie und neurosensorische Systeme ?? fb10_zoologie ?? |
| Hinterlegungsdatum: | 11 Apr 2011 13:27 |
| Letzte Änderung: | 05 Mär 2019 06:48 |
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