Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 75, Issue -, Pages 1-13Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2014.07.009
Keywords
Striatin; DJ-1; Akt; Mitochondria; Membrane; Oxidative stress; Parkinson's disease
Funding
- Department of Biotechnology, Government of India (DBT-BUILDER) [BT/PR7452/Med/14/1004/2006]
- Department of Science and Technology, Government of India [SR/SO/AS-37/2009]
- IUSSTF [IUSSTF/ JC/Cardiovascular Biology/62-2009]
- CSIR, Government of India
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SG2NA is a WD-40 repeat protein with multiple protein-protein interaction domains of unknown functions. We demonstrate that it associates with the antioxidant protein DJ-1 and the survival kinase Akt. The C-terminal WD-40 repeat domain of SG2NA is required for its interaction with Akt, while DJ-1 binds it further upstream. No interaction between DJ-1 and Akt occurs in the absence of SG2NA. SG2NA, DJ-1, and Ala colocalize in mitochondria and plasma membrane. Their association is enhanced by increasing levels of reactive oxygen species up to a threshold level but falters thereafter with further increase in oxidants. Mutants of DJ-1 found in patients with familial parkinsonism are not recruited by SG2NA, suggesting its role in neuroprotection. Cells depleted of SG2NA are susceptible, while those overexpressing it are resistant to apoptosis induced by oxidative stress. Our study thus unravels a novel pathway of recruitment of Akt and DJ-1 that provides protection against oxidative stress, especially in neurons. (C) 2014 Elsevier Inc. All rights reserved.
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