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- W4387606032 abstract "The emergence of new protein functions is crucial for the evolution of organisms. This process has been extensively researched for soluble enzymes, but it is largely unexplored for membrane transporters, even though the ability to acquire new nutrients from a changing environment requires evolvability of transport functions. Here, we demonstrate the importance of environmental pressure in obtaining a new activity or altering a promiscuous activity in members of the Amino acid-Polyamine-organoCation (APC)-type yeast amino acid transporters family. We identify APC members that have broader substrate spectra than previously described. Using in vivo experimental evolution, we evolve two of these transporter genes, AGP1 and PUT4, towards new substrate specificities. Single mutations on these transporters are found to be sufficient for expanding the substrate range of the proteins, while retaining the capacity to transport all original substrates. Nonetheless, each adaptive mutation comes with a distinct effect on the fitness for each of the original substrates, illustrating a trade-off between the ancestral and evolved functions. Collectively, our findings reveal how substrate-adaptive mutations in membrane transporters contribute to fitness and provide insights into how organisms can use transporter evolution to explore new ecological niches." @default.
- W4387606032 created "2023-10-14" @default.
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- W4387606032 date "2023-10-12" @default.
- W4387606032 modified "2023-10-14" @default.
- W4387606032 title "Fitness landscape of substrate-adaptive mutations in evolved APC transporters" @default.
- W4387606032 doi "https://doi.org/10.1101/2023.10.12.562049" @default.
- W4387606032 hasPublicationYear "2023" @default.
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