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The small ubiquitin-like modifier (SUMO), a ubiquitin-like protein involved in posttranslational protein modifications, is activated by several conditions, such as heat stress, hypoxia, and hibernation and confers neuroprotection. Sumoylation enzymes and substrates are expressed also at the plasma membrane level. Among the numerous plasma membrane proteins controlling ionic homeostasis during cerebral ischemia, 1 of the 3 brain sodium/calcium exchangers (NCX3), exerts a protective role during ischemic preconditioning. In this study, we evaluated whether NCX3 is a target for sumoylation and whether this posttranslational modification participates in ischemic preconditioning-induced neuroprotection. To test these hypotheses, we analyzed (1) SUMO1 conjugation pattern after ischemic preconditioning; (2) the effect of SUMO1 knockdown on the ischemic damage after transient middle cerebral artery occlusion and ischemic preconditioning, (3) the possible interaction between SUMO1 and NCX3 and (4) the molecular determinants of NCX3 sequence responsible for sumoylation.

Sumoylation of LYS590 of NCX3 f-Loop by SUMO1 Participates in Brain Neuroprotection Induced by Ischemic Preconditioning