Designed active-site library reveals thousands of functional GFP variants.

Designed active-site library reveals thousands of functional GFP variants.
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DOI:
10.1038/s41467-023-38099-z
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发表时间:
2023-05-20
影响因子:
16.6
通讯作者:
Fleishman, Sarel J.
Fleishman, Sarel J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Weinstein, Jonathan Yaacov;Marti-Gomez, Carlos;Lipsh-Sokolik, Rosalie;Hoch, Shlomo Yakir;Liebermann, Demian;Nevo, Reinat;Weissman, Haim;Petrovich-Kopitman, Ekaterina;Margulies, David;Ivankov, Dmitry;McCandlish, David M.;Fleishman, Sarel J.

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Mutations in a protein active site can lead to dramatic and useful changes in protein activity. The active site, however, is sensitive to mutations due to a high density of molecular interactions, substantially reducing the likelihood of obtaining functional multipoint mutants. We introduce an atomistic and machine-learning-based approach, called high-throughput Functional Libraries (htFuncLib), that designs a sequence space in which mutations form low-energy combinations that mitigate the risk of incompatible interactions. We apply htFuncLib to the GFP chromophore-binding pocket, and, using fluorescence readout, recover >16,000 unique designs encoding as many as eight active-site mutations. Many designs exhibit substantial and useful diversity in functional thermostability (up to 96 °C), fluorescence lifetime, and quantum yield. By eliminating incompatible active-site mutations, htFuncLib generates a large diversity of functional sequences. We envision that htFuncLib will be used in one-shot optimization of activity in enzymes, binders, and other proteins. Mutations in a protein active site can alter function in useful ways, but the active site is sensitive to changes. Here the authors present a general strategy to design combinatorial mutation libraries. Applied to GFP, the authors isolate thousands of fluorescent designs that exhibit large and useful changes in spectral properties.
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