Anaerobic Conditioning of E. coli Cell Lysate for Enhanced In Vitro Protein Synthesis.
Anaerobic Conditioning of E. coli Cell Lysate for Enhanced In Vitro Protein Synthesis.
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DOI:
10.1021/acssynbio.0c00501
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发表时间:
2021-04-16
影响因子:
4.7
通讯作者:
Reuel NF
中科院分区:
文献类型:
--
作者:
Tamiev BD;Dopp JL;Reuel NF
Cell free protein expression (CFPS) from E. coli cell lysate is an established chemical biology technique. Common efforts to improve synthesis capacity, such as strain engineering and process improvements, have overlooked the opportunity to increase productivity by reducing the dependence on limited, dissolved oxygen. Here we demonstrate conditioning E. coli cells for anaerobic respiration which increases the initial protein expression rate up to four-fold and increases titer by 50% as compared to traditional aerobic cell lysate when using sfGFP as a reporter protein in CFPS reactions run at atmospheric conditions. This enhancement is even more significant when run in an oxygen-depleted environment, where anaerobic respiration preconditioned cells increase yield when supplemented with nitrite as a terminal electron acceptor (TEA). Furthermore, we test knockout mutants to determine key proteins responsible for enhancing the anaerobically prepared CFPS lysate. Further improvements could be made in preconditioning cells by increasing expression levels of critical pathway enzymes or by screening other TEA.
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