A sensitive and specific genetically-encoded potassium ion biosensor for in vivo applications across the tree of life

Sheng-Yi Wu, Yurong Wen, Nelson B C Serre, Cathrine Charlotte Heiede Laursen, Andrea Grostøl Dietz, Brian R Taylor, Mikhail Drobizhev, Rosana S Molina, Abhi Aggarwal, Vladimir Rancic, Michael Becker, Klaus Ballanyi, Kaspar Podgorski, Hajime Hirase, Maiken Nedergaard, Matyáš Fendrych, M Joanne Lemieux, Daniel F Eberl, Alan R Kay, Robert E CampbellYi Shen

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14 Citationer (Scopus)
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Abstract

Potassium ion (K+) plays a critical role as an essential electrolyte in all biological systems. Genetically-encoded fluorescent K+ biosensors are promising tools to further improve our understanding of K+-dependent processes under normal and pathological conditions. Here, we report the crystal structure of a previously reported genetically-encoded fluorescent K+ biosensor, GINKO1, in the K+-bound state. Using structure-guided optimization and directed evolution, we have engineered an improved K+ biosensor, designated GINKO2, with higher sensitivity and specificity. We have demonstrated the utility of GINKO2 for in vivo detection and imaging of K+ dynamics in multiple model organisms, including bacteria, plants, and mice.

OriginalsprogEngelsk
Artikelnummere3001772
TidsskriftPLOS Biology
Vol/bind20
Udgave nummer9
Antal sider23
ISSN1544-9173
DOI
StatusUdgivet - 2023

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