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2014 ; 20
(16
): 2497-513
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The branched-chain aminotransferase proteins: novel redox chaperones for protein
disulfide isomerase--implications in Alzheimer s disease
#MMPMID24094038
El Hindy M
; Hezwani M
; Corry D
; Hull J
; El Amraoui F
; Harris M
; Lee C
; Forshaw T
; Wilson A
; Mansbridge A
; Hassler M
; Patel VB
; Kehoe PG
; Love S
; Conway ME
Antioxid Redox Signal
2014[Jun]; 20
(16
): 2497-513
PMID24094038
show ga
AIMS: The human branched-chain aminotransferase proteins (hBCATm and hBCATc) are
regulated through oxidation and S-nitrosation. However, it remains unknown
whether they share common redox characteristics to enzymes such as protein
disulfide isomerase (PDI) in terms of regulating cellular repair and protein
misfolding. RESULTS: Here, similar to PDI, the hBCAT proteins showed
dithiol-disulfide isomerase activity that was mediated through an
S-glutathionylated mechanism. Site-directed mutagenesis of the active thiols of
the CXXC motif demonstrates that they are fundamental to optimal protein folding.
Far Western analysis indicated that both hBCAT proteins can associate with PDI.
Co-immunoprecipitation studies demonstrated that hBCATm directly binds to PDI in
IMR-32 cells and the human brain. Electron and confocal microscopy validated the
expression of PDI in mitochondria (using Mia40 as a mitochondrial control), where
both PDI and Mia40 were found to be co-localized with hBCATm. Under conditions of
oxidative stress, this interaction is decreased, suggesting that the proposed
chaperone role for hBCATm may be perturbed. Moreover, immunohistochemistry
studies show that PDI and hBCAT are expressed in the same neuronal and
endothelial cells of the vasculature of the human brain, supporting a
physiological role for this binding. INNOVATION: This study identifies a novel
redox role for hBCAT and confirms that hBCATm differentially binds to PDI under
cellular stress. CONCLUSION: These studies indicate that hBCAT may play a role in
the stress response of the cell as a novel redox chaperone, which, if
compromised, may result in protein misfolding, creating aggregates as a key
feature in neurodegenerative conditions such as Alzheimer's disease.