title: Human annexin A6 interacts with influenza a virus protein M2 and negatively modulates infection.
abstract: The influenza A virus M2 ion channel protein has the longest cytoplasmic tail (CT) among the three viral envelope proteins and is well conserved between different viral strains. It is accessible to the host cellular machinery after fusion with the endosomal membrane and during the trafficking, assembly, and budding processes. We hypothesized that identification of host cellular interactants of M2 CT could help us to better understand the molecular mechanisms regulating the M2-dependent stages of the virus life cycle. Using yeast two-hybrid screening with M2 CT as bait, a novel interaction with the human annexin A6 (AnxA6) protein was identified, and their physical interaction was confirmed by coimmunoprecipitation assay and a colocalization study of virus-infected human cells. We found that small interfering RNA (siRNA)-mediated knockdown of AnxA6 expression significantly increased virus production, while its overexpression could reduce the titer of virus progeny, suggesting a negative regulatory role for AnxA6 during influenza A virus infection. Further characterization revealed that AnxA6 depletion or overexpression had no effect on the early stages of the virus life cycle or on viral RNA replication but impaired the release of progeny virus, as suggested by delayed or defective budding events observed at the plasma membrane of virus-infected cells by transmission electron microscopy. Collectively, this work identifies AnxA6 as a novel cellular regulator that targets and impairs the virus budding and release stages of the influenza A virus life cycle.
authors: HKU-Pasteur Research Centre, Hong Kong SAR, People’s Republic of China.
authors: Huailiang
authors: H
authors: Ma
authors: François
authors: F
authors: Kien
authors: Maxime
authors: M
authors: Manière
authors: Yang
authors: Y
authors: Zhang
authors: Nadège
authors: N
authors: Lagarde
authors: Kong San
authors: KS
authors: Tse
authors: Leo Lit Man
authors: LL
authors: Poon
authors: Béatrice
authors: B
authors: Nal
mesh_terms: D017317:Annexin A6 / Q000378:metabolism*; D001483:Base Sequence; D017931:DNA Primers; D006801:Humans; D047468:Immunoprecipitation; D011485:Protein Binding; D034741:RNA, Small Interfering; D060888:Real-Time Polymerase Chain Reaction; D014763:Viral Matrix Proteins / Q000378:metabolism*; D000086082:Viroporin Proteins
chemical_list: D017317:Annexin A6; D017931:DNA Primers; D034741:RNA, Small Interfering; D014763:Viral Matrix Proteins; C488937:M2 protein, Influenza A virus; D000086082:Viroporin Proteins