RESUMEN
The platforms based on immobilization of transmembrane proteins have become an effective way to study drug-protein interaction and identify new leads for drug discovery. Herein, we exploited the protein superglue (i.e. SpyTag-SpyCatcher chemistry) for site-specific, oriented, and in-situ one-step beta2-adrenoceptor (ß2-AR) immobilization. SpyCatcher was used as a fusion tag at the C-terminal of ß2-AR and the macroporous silica gels were functionalized with the SpyTag peptide. Immobilization was realized by immersing the gels into the E.coli cell lysate containing ß2-AR-SpyCatcher. Characterization of the functionalized gels was performed by X-ray photoelectron spectroscopy and fluorescence microscopy. Adsorption energy distribution calculation, injection amount dependent analysis (IADA) and nonlinear chromatographic were used for receptor-ligand interaction analysis. The affinity rank order of four ligands to the receptor was tulobuterol> chlorprenaline> salbutamol> terbutaline, which showed highly consistent with data from the radioligand binding assay and the ß2-AR column prepared by HaloTag technology. Magnolol and honokiol were screened from Cortex Magnoliae Officinalis and proved to promote the expression of the receptor in human airway smooth muscle cells. Our work unraveled the great potential to generate good bioactivity of the immobilized ß2-AR through Spy toolbox. This technology can be extended to the immobilization of other functional proteins, providing a better alternative in the field of bioanalysis, biosensing, and separation science.
Asunto(s)
Cromatografía , Descubrimiento de Drogas , Humanos , Unión Proteica , Ligandos , Receptores Adrenérgicos/metabolismo , Receptores Adrenérgicos beta 2/químicaRESUMEN
Adenovirus vector vaccines have been widely and successfully deployed in response to coronavirus disease 2019 (COVID-19). However, despite inducing potent T cell immunity, improvement of vaccine-specific antibody responses upon homologous boosting is modest compared with other technologies. Here, we describe a system enabling modular decoration of adenovirus capsid surfaces with antigens and demonstrate potent induction of humoral immunity against these displayed antigens. Ligand attachment via a covalent bond was achieved using a protein superglue, DogTag/DogCatcher (similar to SpyTag/SpyCatcher), in a rapid and spontaneous reaction requiring only co-incubation of ligand and vector components. DogTag was inserted into surface-exposed loops in the adenovirus hexon protein to allow attachment of DogCatcher-fused ligands on virus particles. Efficient coverage of the capsid surface was achieved using various ligands, with vector infectivity retained in each case. Capsid decoration shielded particles from vector neutralizing antibodies. In prime-boost regimens, adenovirus vectors decorated with the receptor-binding domain of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) spike induced >10-fold higher SARS-CoV-2 neutralization titers compared with an undecorated vector encoding spike. Importantly, decorated vectors achieved equivalent or superior T cell immunogenicity against encoded antigens compared with undecorated vectors. We propose capsid decoration using protein superglues as a novel strategy to improve efficacy and boostability of adenovirus-based vaccines and therapeutics.
Asunto(s)
Vacunas contra el Adenovirus , COVID-19 , Humanos , SARS-CoV-2 , Inmunidad Humoral , Ligandos , COVID-19/prevención & controlRESUMEN
New biological properties can stem from the freedom to link, multimerize, or multiplex protein building blocks. The peptide SpyTag on one protein irreversibly reacts with SpyCatcher on another protein, through spontaneous isopeptide bond formation. Reaction is specific in a wide range of cellular environments and all components are genetically encoded, making this chemistry accessible to molecular biologists. SpyTag/SpyCatcher has been widely used for enzyme immobilization, colocalization of different enzymatic activities, and increasing enzyme resilience. Here we present routes and advice for efficient design, expression, and purification of SpyTag/SpyCatcher constructs in bacterial and eukaryotic environments, including the latest 002 variants, and how to analyze reaction efficiency. The SpyInfo webpage collates the different publications and patents using SpyTag/SpyCatcher, while the SpyBank database lists their sequences and expression routes. The ability of SpyTag/SpyCatcher to react in a broad range of situations creates diverse opportunities for augmenting the function of enzymes and other biomolecules.