This chapter reviews the different promoters used to control gene expression in the yeast Pichia pastoris, mainly for recombinant protein production. It covers natural inducible, derepressed, and constitutive promoters, as well as engineered synthetic/hybrid promoters, orthologous promoters from related yeasts, and emerging bidirectional promoters. Key examples, characteristics, and regulatory mechanisms are discussed for each promoter class. Recent efforts in promoter engineering through rational design, mutagenesis, and computational approaches are also highlighted. Looking ahead, we anticipate further developments that will enhance promoter design for Pichia pastoris. Overall, this comprehensive overview underscores the importance of promoter choice and engineering for fully harnessing Pichia pastoris biotechnological potential.
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