Abstract:
:Epistasis emerges when the effects of an amino acid depend on the identities of interacting residues. This phenomenon shapes fitness landscapes, which have the power to reveal evolutionary paths and inform evolution of desired functions. However, there is a need for easily implemented, high-throughput methods to capture epistasis particularly at distal sites. Here, we combine deep mutational scanning (DMS) with a straightforward data processing step to bridge reads in distal sites within genes (BRIDGE). We use BRIDGE, which matches non-overlapping reads to their cognate templates, to uncover prevalent epistasis within the binding pocket of a human G protein-coupled receptor (GPCR) yielding variants with 4-fold greater affinity to a target ligand. The greatest functional improvements in our screen result from distal substitutions and substitutions that are deleterious alone. Our results corroborate findings of mutational tolerance in GPCRs, even in conserved motifs, but reveal inherent constraints restricting tolerated substitutions due to epistasis.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Yoo JI,Daugherty PS,O'Malley MAdoi
10.1038/s41467-020-14495-7subject
Has Abstractpub_date
2020-02-04 00:00:00pages
690issue
1issn
2041-1723pii
10.1038/s41467-020-14495-7journal_volume
11pub_type
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