期刊
ACS CENTRAL SCIENCE
卷 6, 期 8, 页码 1441-1450出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscentsci.0c00518
关键词
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资金
- Natural Sciences and Engineer-ing Research Council of Canada (NSERC) [RGPIN 2018 04364]
- Canadian Institutes of Health Research (CIHR) [FS 154310]
- National Natural Science Foundation of China [31870132, 81741088]
Motivated by the growing recognition of citrate as a central metabolite in a variety of biological processes associated with healthy and diseased cellular states, we have developed a series of high-performance genetically encoded citrate biosensors suitable for imaging of citrate concentrations in mammalian cells. The design of these biosensors was guided by structural studies of the citrate-responsive sensor histidine kinase and took advantage of the same conformational changes proposed to propagate from the binding domain to the catalytic domain. Following extensive engineering based on a combination of structure guided mutagenesis and directed evolution, we produced an inverse-response biosensor(Delta F/F-min approximate to 18) designated Citroffl and a direct- response biosensor (Delta F/F-min approximate to 9) designated Citronl. We report the X-ray crystal structure of Citronl and demonstrate the utility of both biosensors for qualitative and quantitative imaging of steady-state and pharmacologically perturbed citrate concentrations in live cells.
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