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Cytoskeletal proteins are susceptible to glutathionylation under oxidizing conditions,and oxidative damage has been implicated in several neurodegenerative diseases.End-binding protein 1 (EB1) is a master regulator of microtubule plus-end tracking proteins (+TIPs) and is critically involved in the control ofmicrotubule dynamics and cellular processes.However,the impact of glutathionylation on EB1 functions remains unknown.Here we reveal that glutathionylation is important for controlling EB1 activity and protecting EB 1 from irreversible oxidation.In vitro biochemical and cellular assays reveal that EB 1 is glutathionylated.Diamide,a mild oxidizing reagent,reduces EB1 comet number and length in cells,indicating the impairment of microtubule dynamics.Three cysteine residues of EB 1 are glutathionylated,with mutations of these three cysteines to serines attenuating microtubule dynamics but buffering diamide-induced decrease in microtubule dynamics.In addition,glutaredoxin 1 (Grx1) deglutathionylates EB1,and Grx1 depletion suppresses microtubule dynamics and leads to defects in cell division orientation and cell migration,suggesting a critical role of Grx1-mediated deglutathionylation in maintaining EB1 activity.Collectively,these data reveal that EB 1 glutathionylation is an important protective mechanism for the regulation of microtubule dynamics and microtubule-based cellular activities.