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  • Title: Heregulin beta1 induces the down regulation and the ubiquitin-proteasome degradation pathway of p185HER2 oncoprotein.
    Author: Magnifico A, Tagliabue E, Ardini E, Casalini P, Colnaghi MI, Ménard S.
    Journal: FEBS Lett; 1998 Jan 30; 422(2):129-31. PubMed ID: 9489990.
    Abstract:
    Analysis of the fate of the p185HER2 oncoprotein following activation by heregulin beta1 revealed the induction of the tyrosine-phosphorylation, down-modulation, and polyubiquitination of p185HER2. Receptor ubiquitination was suppressed in cells treated with heregulin beta1 in the presence of sodium azide, an inhibitor of ATP-dependent reactions, or genistein, a tyrosine kinase protein inhibitor, indicating the requirement for kinase activity and ATP in p185HER2 polyubiquitination. Ubiquitinated p185HER2 was degradated by the 26S proteasome proteolytic pathway. Kinetics and inhibition experiments indicated that endocytosis of the receptor occurs downstream of the initiation of the degradation process.
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