AUTHOR=Strobbe Daniela, Robinson Alexis A., Harvey Kirsten, Rossi Lara, Ferraina Caterina, de Biase Valerio, Rodolfo Carlo, Harvey Robert J., Campanella Michelangelo TITLE=Distinct Mechanisms of Pathogenic DJ-1 Mutations in Mitochondrial Quality Control JOURNAL=Frontiers in Molecular Neuroscience VOLUME=11 YEAR=2018 URL=https://www.frontiersin.org/articles/10.3389/fnmol.2018.00068 DOI=10.3389/fnmol.2018.00068 ISSN=1662-5099 ABSTRACT=The deglycase and chaperone protein DJ-1 is pivotal for cellular oxidative stress responses and mitochondrial quality control. Mutations in PARK7, encoding DJ-1, are associated with early-onset familial Parkinson’s disease and lead to pathological oxidative stress and/or disrupted protein degradation by the proteasome. The aim of this study was to gain insights into the pathogenic mechanisms of selected DJ-1 missense mutations, by characterizing protein–protein interactions, core parameters of mitochondrial function, quality control regulation via autophagy, and cellular death following dopamine accumulation. We report that the DJ-1M26I mutant influences DJ-1 interactions with SUMO-1, in turn enhancing removal of mitochondria and conferring increased cellular susceptibility to dopamine toxicity. By contrast, the DJ-1D149A mutant does not influence mitophagy, but instead impairs Ca2+ dynamics and free radical homeostasis by disrupting DJ-1 interactions with a mitochondrial accessory protein known as DJ-1-binding protein (DJBP/EFCAB6). Thus, individual DJ-1 mutations have different effects on mitochondrial function and quality control, implying mutation-specific pathomechanisms converging on impaired mitochondrial homeostasis.