11/30/2023 0 Comments Spep alfa 2 m spike meaning![]() ![]() Received: JanuAccepted: Published: May 24, 2022 Henry, National Research Council Canada, CANADA (2022) Molecular probes of spike ectodomain and its subdomains for SARS-CoV-2 variants, Alpha through Omicron. ![]() Overall, this study describes a matrix of SARS-CoV-2 variant molecular probes that allow for assessment of immune responses, identification of serum antibody specificity, and isolation and characterization of neutralizing antibodies.Ĭitation: Teng I-T, Nazzari AF, Choe M, Liu T, Oliveira de Souza M, Petrova Y, et al. We deposited these constructs to Addgene to enable their dissemination. We functionally validated probes by using yeast expressing a panel of nine SARS-CoV-2 spike-binding antibodies and confirmed sorting capabilities of variant probes using yeast displaying libraries of plasma antibodies from COVID-19 convalescent donors. ![]() We characterized the physical properties and antigenicity of these probes, comprising the N-terminal domain (NTD), the receptor-binding domain (RBD), the RBD and subdomain 1 (RBD-SD1), and the prefusion-stabilized spike ectodomain (S2P) with sequences from SARS-CoV-2 variants of concern or of interest, including variants Alpha, Beta, Gamma, Epsilon, Iota, Kappa, Delta, Lambda, Mu, and Omicron. These probes could be produced by a single step using in-process biotinylation and purification. To facilitate the isolation of neutralizing antibodies and the monitoring of vaccine effectiveness against these variants, we designed and produced biotin-labeled molecular probes of variant SARS-CoV-2 spikes and their subdomains, using a structure-based construct design that incorporated an N-terminal purification tag, a specific amino acid sequence for protease cleavage, the variant spike-based region of interest, and a C-terminal sequence targeted by biotin ligase. In particular, mutations in the SARS-CoV-2 spike have drawn attention. Some of these variants show increased resistance to vaccine-elicited immunity, convalescent plasma, or monoclonal antibodies. Since the outbreak of the COVID-19 pandemic, widespread infections have allowed SARS-CoV-2 to evolve in human, leading to the emergence of multiple circulating variants. ![]()
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