Abstract
The ubiquitin-proteasome pathway (UPP) regulates synaptic function, but little is known about specific UPP targets and mechanisms in mammalian synapses. We report here that the SCFβ-TRCP complex, a multisubunit E3 ubiquitin ligase, targets the postsynaptic spine-associated Rap GTPase activating protein (SPAR) for degradation in neurons. SPAR degradation by SCFβ-TRCP depended on the activity-inducible protein kinase Polo-like kinase 2 (Plk2). In the presence of Plk2, SPAR physically associated with the SCFβ-TRCP complex through a canonical phosphodegron. In hippocampal neurons, disruption of the SCFβ-TRCP complex by overexpression of dominant interfering β-TRCP or Cul1 constructs prevented Plk2-dependent degradation of SPAR. Our results identify a specific E3 ubiquitin ligase that mediates degradation of a key postsynaptic regulator of synaptic morphology and function.
Original language | English (US) |
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Pages (from-to) | 29424-29432 |
Number of pages | 9 |
Journal | Journal of Biological Chemistry |
Volume | 283 |
Issue number | 43 |
DOIs | |
State | Published - Oct 24 2008 |
Externally published | Yes |
ASJC Scopus subject areas
- Biochemistry
- Molecular Biology
- Cell Biology