tetano
Editor, Senior Moderator
J Virol. 2012 Aug 8. [Epub ahead of print]
Filamentous Influenza Virus Enters Cells Via Macropinocytosis.
Rossman JS, Leser GP, Lamb RA.
Source
Department of Molecular Biosciences.
Abstract
Influenza virus is pleiomorphic, producing both spherical (100 nm in diameter) and filamentous virions (100 nm ? 20 μm long). While the spherical virions are known to enter host cells through exploitation of clathrin-mediated endocytosis, the entry pathway for filamentous virions has not been determined, though the existence of an alternative, non-clathrin, non-caveolin mediated entry pathway for influenza virus has been known for many years. In this study we confirm recent results showing that influenza virus utilizes macropinocytosis as an alternate entry pathway. Furthermore, we find that filamentous influenza viruses use macropinocytosis as the primary entry mechanism. Virions enter cells as intact filaments within macropinosomes and are trafficked to the acidic late endosomal compartment. Low pH triggers a conformational change in the M2 ion channel protein, altering membrane curvature and leading to a fragmentation of the filamentous virions. This fragmentation may enable more efficient fusion between the viral and endosomal membranes.
PMID:
22875971
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22875971
Filamentous Influenza Virus Enters Cells Via Macropinocytosis.
Rossman JS, Leser GP, Lamb RA.
Source
Department of Molecular Biosciences.
Abstract
Influenza virus is pleiomorphic, producing both spherical (100 nm in diameter) and filamentous virions (100 nm ? 20 μm long). While the spherical virions are known to enter host cells through exploitation of clathrin-mediated endocytosis, the entry pathway for filamentous virions has not been determined, though the existence of an alternative, non-clathrin, non-caveolin mediated entry pathway for influenza virus has been known for many years. In this study we confirm recent results showing that influenza virus utilizes macropinocytosis as an alternate entry pathway. Furthermore, we find that filamentous influenza viruses use macropinocytosis as the primary entry mechanism. Virions enter cells as intact filaments within macropinosomes and are trafficked to the acidic late endosomal compartment. Low pH triggers a conformational change in the M2 ion channel protein, altering membrane curvature and leading to a fragmentation of the filamentous virions. This fragmentation may enable more efficient fusion between the viral and endosomal membranes.
PMID:
22875971
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22875971