Membrane deformations induced by the matrix protein of vesicular stomatitis virus in a minimal system Free

Abstract

The matrix (M) protein of vesicular stomatitis virus plays a key role in both assembly and budding of progeny virions. experiments have shown a strong propensity of M protein to bind to vesicles containing negatively charged phospholipids. , it has also been demonstrated that recruitment of some cellular proteins by M protein is required for efficient virus budding and release of newly synthesized virions in the extracellular medium. The ability of M protein to deform target membranes was investigated in this study. It was shown that incubation of purified M protein with giant unilamellar vesicles results in the formation of patches of M protein at their surface, followed by deformations of the membrane toward the inside of the vesicle, which could be observed in phase-contrast microscopy. This provides the first evidence that M protein alone is able to impose the correct budding curvature on the membrane. Using confocal microscopy, patches of M protein that colocalized with negatively charged lipid domains a few minutes after vesicle injection were observed. After a longer incubation period, membrane deformations appeared in these domains. At this time, a strict colocalization of M protein, negatively charged lipids and membrane deformation was observed. The influence on this process of the basic N-terminal part of the protein and of the previously identified hydrophobic loop has also been investigated. Interestingly, the final fission event has never been observed in our experimental system, indicating that other partners are required for this step.

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2005-12-01
2024-03-28
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