Comparasion of the effectiveness of anchor proteins ScAGα1p, KpCW51p, KpCW61p for surface display in yeast Komagataella phaffii

BACKGROUND: Yeast display is an effective technology for exposure target proteins to the cell surface by fusing them with cell wall proteins. This technique, among other things, makes it possible to obtain vaccine preparations based on yeast by exposing antigen proteins on their cell surface. Finding and selecting proteins that allow effective exposure of target proteins on the surface of yeast cells is an urgent task. 
AIM: The aim of this work was to evaluate the efficiency of cell wall proteins ScAG1p, KpCW51p, KpCW61p for displaying the reporter protein on the Komagataella phaffii cell surface, including the study of several variants of the ScAG1 gene coding sequence. 
MATERIALS AND METHODS: The studied gene sequences were cloned under the control of the AOX1 gene promoter in the same reading frame as the eGFP reporter protein gene and integrated into the genome of the K. Phaffii yeast strain X-33. 
RESULTS: Cytoimmunochemical analysis and confocal microscopy of strains displaying the eGFP protein on their surface under conditions of induction of the AOX1 gene promoter made it possible to identify the most effective anchor protein. The best efficiency was demonstrated for the sequence of the ScAG1 gene without the native 3' non-coding region. 
CONCLUSIONS: The plasmids obtained in the work will make it possible to obtain a yeast strain K. phaffii that effectively exposure proteins, including antigens, on its surface, which can be used as a vaccine preparation.