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2016 ; 12
(8
): 2471-80
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A clickable glutathione approach for identification of protein glutathionylation
in response to glucose metabolism
#MMPMID27216279
Samarasinghe KT
; Munkanatta Godage DN
; Zhou Y
; Ndombera FT
; Weerapana E
; Ahn YH
Mol Biosyst
2016[Jul]; 12
(8
): 2471-80
PMID27216279
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Glucose metabolism and mitochondrial function are closely interconnected with
cellular redox-homeostasis. Although glucose starvation, which mimics ischemic
conditions or insufficient vascularization, is known to perturb
redox-homeostasis, global and individual protein glutathionylation in response to
glucose metabolism or mitochondrial activity remains largely unknown. In this
report, we use our clickable glutathione approach, which forms clickable
glutathione (azido-glutathione) by using a mutant of glutathione synthetase (GS
M4), for detection and identification of protein glutathionylation in response to
glucose starvation. We found that protein glutathionylation is readily induced in
HEK293 cells in response to low glucose concentrations when mitochondrial
reactive oxygen species (ROS) are elevated in cells, and glucose is the major
determinant for inducing reversible glutathionylation. Proteomic and biochemical
analysis identified over 1300 proteins, including SMYD2, PP2C?, and catalase. We
further showed that PP2C? is glutathionylated at C314 in a C-terminal domain, and
PP2C? C314 glutathionylation disrupts the interaction with mGluR3, an important
glutamate receptor associated with synaptic plasticity.