Format

Send to

Choose Destination
Cell Rep. 2016 Nov 22;17(9):2221-2233. doi: 10.1016/j.celrep.2016.10.045.

LC3C Contributes to Vpu-Mediated Antagonism of BST2/Tetherin Restriction on HIV-1 Release through a Non-canonical Autophagy Pathway.

Author information

1
Inserm, U1016, Institut Cochin, 75014 Paris, France; Cnrs, UMR8104, 75014 Paris, France; University Paris Descartes, Sorbonne Paris Cité, 75014 Paris, France.
2
Inserm, U1016, Institut Cochin, 75014 Paris, France; Cnrs, UMR8104, 75014 Paris, France; University Paris Descartes, Sorbonne Paris Cité, 75014 Paris, France. Electronic address: clarisse.berlioz@inserm.fr.

Abstract

BST2 (bone marrow stromal antigen 2)/tetherin is a restriction factor of enveloped viruses, which blocks the release of viral particles. HIV-1 encodes proteins that antagonize this innate barrier, including the accessory protein Vpu. Here, we investigate whether the autophagy pathway and/or ATG proteins are hijacked by HIV-1 Vpu to circumvent BST2 restriction of viral release. We report that BST2 and Vpu are present in LC3-positive compartments. We found that Vpu selectively interacts with the ATG8 ortholog LC3C through the Vpu L63VEM66 sequence. This sequence is required for Vpu to antagonize BST2 restriction. LC3C expression favors the removal of BST2 from the HIV-1 budding site, and thus HIV-1 release in BST2-expressing cells. Additionally, ATG5 and beclin 1/ATG6, but not all the components of the autophagy pathway, act with LC3C to facilitate Vpu antagonism of BST2 restriction. Altogether, our data support the view that a non-canonical autophagy pathway reminiscent of LC3-associated phagocytosis contributes to Vpu counteraction of BST2 restriction.

KEYWORDS:

ATG; ATG5; BST2; HIV-1; LC3-associated phagocytosis; LC3C; Vpu; autophagy; restriction; tetherin

PMID:
27880899
DOI:
10.1016/j.celrep.2016.10.045
[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center