Protocol for screening and validating antibodies specific to protein phosphorylation sites using a set of yeast biopanning approaches

Developing antibodies with high specificity against post-translationally modified epitopes remains a challenge. Yeast biopanning is well suited in screening for high-specificity binders. Here, we present a protocol for screening and validating antibodies specific to protein phosphorylation sites using a set of yeast biopanning approaches. We describe steps for screening a yeast surface display library for antibodies and other binders. We then detail procedures for validating the antibodies found by analyzing their specificity through whole-well image analysis in 96-well plates. For complete details on the use and execution of this protocol, please refer to Arbaciauskaite et al.