Download MendeleyDirect lipid interactions control SARS-CoV-2 M protein conformational dynamics and virus assembly.
Dutta, M., Dolan, K.A., Amiar, S., Bass, E.J., Sultana, R., Voth, G.A., Brohawn, S.G., Stahelin, R.V.(2024) bioRxiv
- PubMed: 39574576
- DOI: https://doi.org/10.1101/2024.11.04.620124
- Primary Citation of Related Structures:
9CTU, 9CTW - PubMed Abstract:
M is the most abundant structural membrane protein in coronaviruses and is essential for the formation of infectious virus particles. SARS-CoV-2 M adopts two conformations, M short and M long , and regulated transition between states is hypothesized to coordinate viral assembly and budding. However, the factors that regulate M conformation and roles for each state are unknown. Here, we discover a direct M-sphingolipid interaction that controls M conformational dynamics and virus assembly. We show M binds Golgi-enriched anionic lipids including ceramide-1-phosphate (C1P). Molecular dynamics simulations show C1P interaction promotes a long to short transition and energetically stabilizes M short . Cryo-EM structures show C1P specifically binds M short at a conserved site bridging transmembrane and cytoplasmic regions. Disrupting M short -C1P interaction alters M subcellular localization, reduces interaction with Spike and E, and impairs subsequent virus-like particle cell entry. Together, these results show endogenous signaling lipids regulate M structure and support a model in which M short is stabilized in the early endomembrane system to organize other structural proteins prior to viral budding.
Organizational Affiliation:
Department of Chemistry, The University of Chicago, Chicago, IL 60637.
