Project description:The SARS-CoV-2 Delta variant is more contagious than WT and causes severe symptoms.To understand the elevated fusogenicity of Delta, we used LC-MS/MS to characterize the site specific N-linked glycan of spike protein in SARS-CoV-2 Delta variant virions.The glycan analysis revealed increased oligomannose-type glycosylation of native Delta spike over that of the Wuhan-Hu-1 spike.

2023-05-10 | PXD033342 | Pride

Severe acute respiratory syndrome coronavirus 2

Project description:A next-generation viral evolution platform maps mutational constraints on SARS-CoV-2 Spike with authentic virus-like particles

| PRJNA1116786 | ENA

SARS-CoV-2 pseudovirus strain:XBB.1.5

Project description:SARS-CoV-2 XBB.1.5 RBD-only pseudovirus based deep mutational scanning libraries

| PRJNA1035795 | ENA

Project description:Deep mutational scanning of SARS-CoV-2 spike fusion peptide

| PRJNA910585 | ENA

The Receptor Binding Domain of SARS-CoV-2 Omicron Subvariants Targets Siglec-9 to Decrease the Immunogenicity by Preventing Phagocytosis of Macrophages

Project description:SARS-CoV-2 Omicron infection results in a milder clinical feature compared to the Delta strain. The development of Omicron specific vaccine has also been hampered due to the low immunogenicity. By reverse-mutating the amino acids in the Omicron receptor binding domain (RBD), we identified that the mutation from Phenylalanine 375 (F375) in the Omicron spike to Serine 375 (S375) in Delta and other early strains significantly enhances the immune response in the manner of vaccines. Interestingly, the new evolution of the 371FAPF375FAF sequence in Omicron exhibited a potent inhibitory effect on macrophage uptake of the RBD nanoparticle or spike-pseudovirus particles. Omicron RBD enhances binding to Siglec-9 on macrophages to reduce the immunogenicity and increase the immune evasion, which could be abrogated by Serine 375 mutation. Based upon these observations, we further developed a bivalent Omicron RBD with S375 mutation and Delta RBD nanoparticle vaccine, which elicited potent and broad neutralizing antibodies in mice, rabbits, and rhesus macaques. Our research suggests that manipulating the Siglec-9 pathway could be a promising approach to enhancing vaccine response. Importantly, our findings suggest that Omicron subvariants have developed a new strategy to evade immune surveillance by impairing the phagocytosis and antigen presentation processes of macrophages.

2023-12-28 | GSE251973 | GEO

Transcriptional profiling of CAI4 (Wild-type), cpp1Δ/Δ, cek1Δ/Δ, cek2Δ/Δ, cpp1Δ/Δ cek1Δ/Δ, cpp1Δ/Δ cek2Δ/Δ and cek1Δ/Δ cek2Δ/Δ strains in the absence or presence of alpha pheromone in Candida albicans

Project description:Twenty-one pheromone-induced genes were selected from the literature (Zhao, Daniels et al. 2005 was the major source) as the reference set for assessing the pheromone response of CAI4 (Wild-type), cpp1Δ/Δ, cek1Δ/Δ, cek2Δ/Δ, cpp1Δ/Δ cek1Δ/Δ, cpp1Δ/Δ cek2Δ/Δ and cek1Δ/Δ cek2Δ/Δ strains.Our aim was to check whether or not these 21 pheromone-induced genes are up-regulated in response to pheromone in each mutant strain.

2019-01-26 | GSE125636 | GEO

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