Abstract
Serotonin (5-HT) is an important signaling monoamine and neurotransmitter. We report structure-guided engineering of a green fluorescent, genetically encoded serotonin sensor (G-GESS) from a 5-HT-binding lipocalin in the soft tick Argas monolakensis. G-GESS shows fast response kinetics and high affinity, specificity, brightness and photostability. We used G-GESS to image 5-HT dynamics in cultured cells, brain slices and behaving mice. G-GESS is a serotonin biosensor, derived from a tick serotonin-binding protein. The biosensor has been applied here in cell culture, primary neurons, mouse brain slices and in vivo in the mouse brain.
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