5m1m
Crystal structure of matrix protein 1 from Influenza C virus (strain C/Ann Arbor/1/1950)Crystal structure of matrix protein 1 from Influenza C virus (strain C/Ann Arbor/1/1950)
Structural highlights
FunctionMAT_INCAA Ion channel, which might have a role in genome packaging and uncoating processes.[1] Publication Abstract from PubMedMatrix proteins from enveloped viruses play an important role in budding and stabilizing virus particles. In order to assess the role of the matrix protein M1 from influenza C virus (M1-C) in plasma membrane deformation, we have combined structural and in vitro reconstitution experiments with model membranes. We present the crystal structure of the N-terminal domain of M1-C and show by Small Angle X-Ray Scattering analysis that full-length M1-C folds into an elongated structure that associates laterally into ring-like or filamentous polymers. Using negatively charged giant unilamellar vesicles (GUVs), we demonstrate that M1-C full-length binds to and induces inward budding of membrane tubules with diameters that resemble the diameter of viruses. Membrane tubule formation requires the C-terminal domain of M1-C, corroborating its essential role for M1-C polymerization. Our results indicate that M1-C assembly on membranes constitutes the driving force for budding and suggest that M1-C plays a key role in facilitating viral egress. The Matrix protein M1 from influenza C virus induces tubular membrane invaginations in an in vitro cell membrane model.,Saletti D, Radzimanowski J, Effantin G, Midtvedt D, Mangenot S, Weissenhorn W, Bassereau P, Bally M Sci Rep. 2017 Jan 25;7:40801. doi: 10.1038/srep40801. PMID:28120862[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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