Xanthohumol impairs autophagosome maturation through direct inhibition of valosin-containing protein.

Abstract:

:Autophagy is a bulk, nonspecific protein degradation pathway that is involved in the pathogenesis of cancer and neurodegenerative disease. Here, we observed that xanthohumol (XN), a prenylated chalcone present in hops (Humulus lupulus L.) and beer, modulates autophagy. By using XN-immobilized beads, valosin-containing protein (VCP) was identified as a XN-binding protein. VCP has been reported to be an essential protein for autophagosome maturation. Using an in vitro pull down assay, we showed that XN bound directly to the N domain, which is known to mediate cofactor and substrate binding to VCP. These data indicated that XN inhibited the function of VCP, thereby allowing the impairment of autophagosome maturation and resulting in the accumulation of microtubule-associated protein 1 light chain 3-II (LC3-II). This is the first report demonstrating XN as a VCP inhibitor that binds directly to the N domain of VCP. Our finding that XN bound to and inactivated VCP not only reveals the molecular mechanism of XN-modulated autophagy but may also explain how XN exhibits various biological activities that have been reported previously.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Sasazawa Y,Kanagaki S,Tashiro E,Nogawa T,Muroi M,Kondoh Y,Osada H,Imoto M

doi

10.1021/cb200492h

subject

Has Abstract

pub_date

2012-05-18 00:00:00

pages

892-900

issue

5

eissn

1554-8929

issn

1554-8937

journal_volume

7

pub_type

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