Structurally distributed surface sites tune allosteric regulation

eLife

Samuel Thompson¹  Aubrie Blevins²  Marielle AX Russo³  Kimberly A Reynolds³  James W McCormick³ 

[1] Department of Bioengineering, Stanford University, Stanford, United States;The Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, United States;The Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, United States;Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, United States;

关键词: dihydrofolate reductase;    allostery;    LOV2;    deep mutational scanning;    coevolution;    sectors;    E. coli;   

DOI  :  10.7554/eLife.68346

来源: eLife Sciences Publications, Ltd

【 摘 要 】

Our ability to rationally optimize allosteric regulation is limited by incomplete knowledge of the mutations that tune allostery. Are these mutations few or abundant, structurally localized or distributed? To examine this, we conducted saturation mutagenesis of a synthetic allosteric switch in which Dihydrofolate reductase (DHFR) is regulated by a blue-light sensitive LOV2 domain. Using a high-throughput assay wherein DHFR catalytic activity is coupled to E. coli growth, we assessed the impact of 1548 viable DHFR single mutations on allostery. Despite most mutations being deleterious to activity, fewer than 5% of mutations had a statistically significant influence on allostery. Most allostery disrupting mutations were proximal to the LOV2 insertion site. In contrast, allostery enhancing mutations were structurally distributed and enriched on the protein surface. Combining several allostery enhancing mutations yielded near-additive improvements to dynamic range. Our results indicate a path toward optimizing allosteric function through variation at surface sites.

【 授权许可】

CC BY