The nuclear ubiquitin-proteasome system degrades MyoD

The Journal of Biological Chemistry
Z E FloydA L Schwartz

Abstract

Many short-lived nuclear proteins are targeted for degradation by the ubiquitin-proteasome pathway. The role of the nucleus in regulating the turnover of these proteins is not well defined, although many components of the ubiquitin-proteasome system are localized in the nucleus. We have used nucleoplasm from highly purified HeLa nuclei to examine the degradation of a physiological substrate of the ubiquitin-proteasome system (MyoD). In vitro studies using inhibitors of the system demonstrate MyoD is degraded via the ubiquitin-proteasome pathway in HeLa nucleoplasm. Purified nucleoplasm in vitro also supports the generation of high molecular mass MyoD-ubiquitin adducts. In addition, in vivo studies, using leptomycin B to inhibit nuclear export, demonstrate that MyoD is degraded in HeLa cells by the nuclear ubiquitin-proteasome system.

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