Abstract
Mammalian peptidoglycan recognition proteins (PGLYRPs) are highly conserved pattern-recognition molecules of the innate immune system with considerable bactericidal activity, which manifest their potential values for the application to food and pharmaceutical industry. However, the effective expression of porcine PGLYRP-1 in Pichia pastoris has not been reported so far. In this study, expression in P. pastoris was explored as an efficient way to produce functional porcine PGLYRP-1. Cooperation of chaperones co-expression and gene dosage (including protein disulfide isomerase (PDI)/binding protein (BiP) and pglyrp-1) were used to enhance functional expression of antimicrobial protein in P. pastoris. Overexpression of PDI was certainly able to increase secretion level of PGLYRP-1 protein because the increase in secreted PGLYRP-1 secretion was correlated with the copy numbers of PDI in high copy pglyrp-1 clones. However, co-expression of BiP was proved to be detrimental to PGLYRP-1 secretion. In addition, we also found that excessive expression of PDI and/or BiP could decrease the mRNA expression of pglyrp-1 gene. This showed that PDI and BiP as the target genes of unfolded protein response (UPR) might regulate the transcription of the target protein. These data demonstrated for the first time that the combination of chaperones and gene dosages could improve the yield of PGLYRP-1, which could facilitate the application to food and pharmaceutical industry.
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This study was funded by the Natural Science Foundation of Guangdong Province (No: 2015 A030312005, 2014 A030313449).
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Yang, J., Lu, Z., Chen, J. et al. Effect of cooperation of chaperones and gene dosage on the expression of porcine PGLYRP-1 in Pichia pastoris . Appl Microbiol Biotechnol 100, 5453–5465 (2016). https://doi.org/10.1007/s00253-016-7372-4
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DOI: https://doi.org/10.1007/s00253-016-7372-4