The RUN domain of Rubicon is important for hVps34 binding, lipid kinase inhibition, and autophagy suppression

Qiming Sun, Jing Zhang, Weiliang Fan, Kwun Ngok Wong, Xiaojun Ding, She Chen, Qing Zhong

Research output: Contribution to journalArticle

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Abstract

The class III phosphatidylinositol 3-kinase (PI3KC3) plays a central role in autophagy. Rubicon, a RUN domain-containing protein, is newly identified as a PI3KC3 subunit through its association with Beclin 1. Rubicon serves as a negative regulator of PI3KC3 and autophagosome maturation. The molecular mechanism underlying the PI3KC3 and autophagy inhibition by Rubicon is largely unknown. Here, we demonstrate that Rubicon interacts with the PI3KC3 catalytic subunit hVps34 via its RUN domain. The RUN domain contributes to the efficient inhibition of PI3KC3 lipid kinase activity by Rubicon. Furthermore, a Rubicon RUN domain deletion mutant fails to complement the autophagy deficiency in Rubicon-depleted cells. Hence, these results reveal a critical role of the Rubicon RUN domain in PI3KC3 and autophagy regulation.

Original languageEnglish (US)
Pages (from-to)185-191
Number of pages7
JournalJournal of Biological Chemistry
Volume286
Issue number1
DOIs
StatePublished - Jan 7 2011

Fingerprint

Class III Phosphatidylinositol 3-Kinases
Autophagy
Phosphotransferases
Lipids
Proteins
Catalytic Domain

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

The RUN domain of Rubicon is important for hVps34 binding, lipid kinase inhibition, and autophagy suppression. / Sun, Qiming; Zhang, Jing; Fan, Weiliang; Wong, Kwun Ngok; Ding, Xiaojun; Chen, She; Zhong, Qing.

In: Journal of Biological Chemistry, Vol. 286, No. 1, 07.01.2011, p. 185-191.

Research output: Contribution to journalArticle

Sun, Qiming ; Zhang, Jing ; Fan, Weiliang ; Wong, Kwun Ngok ; Ding, Xiaojun ; Chen, She ; Zhong, Qing. / The RUN domain of Rubicon is important for hVps34 binding, lipid kinase inhibition, and autophagy suppression. In: Journal of Biological Chemistry. 2011 ; Vol. 286, No. 1. pp. 185-191.
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