Trends in Biotechnology, 2026 (SCI-Expanded, Scopus)
The yeast Komagataella phaffii is a leading producer of secreted therapeutic and industrial proteins. Its excellent traits make it a primary host for the production of value-added carbon compounds, including native metabolites, heterologous biomolecules, and synthetic chemicals. Recent breakthrough discoveries in engineering synthetic promoters have set the stage for novel bioprocesses that utilize sustainable carbon sources through directed evolution methods, ushering in a new era in bioindustry. This review discusses how engineering-directed transcriptional machinery element (TME) interaction-driven methodologies can unlock latent potential to rewire expression for the directed evolution of metabolic functions. We highlight discoveries in the design of transcriptional switches and metabolic switches, the reverse-engineering TME interaction via synthetic transcription factors, forcing K. phaffii for directed evolution.