Structural and Functional Impact of Parkinson Disease-Associated Mutations in the E3 Ubiquitin Ligase Parkin.
Mutations in the PARKIN/PARK2 gene that result in loss-of-function of the encoded, neuroprotective E3 ubiquitin ligase Parkin cause recessive, familial early-onset Parkinson disease. As an increasing number of rare Parkin sequence variants with unclear pathogenicity are identified, structure-function analyses will be critical to determine their disease relevance. Depending on the specific amino acids affected, several distinct pathomechanisms can result in loss of Parkin function. These include disruption of overall Parkin folding, decreased solubility, and protein aggregation. However pathogenic effects can also result from misregulation of Parkin autoinhibition and of its enzymatic functions. In addition, interference of binding to coenzymes, substrates, and adaptor proteins can affect its catalytic activity too. Herein, we have performed a comprehensive structural and functional analysis of 21 PARK2 missense mutations distributed across the individual protein domains. Using this combined approach, we were able to pinpoint some of the pathogenic mechanisms of individual sequence variants. Similar analyses will be critical in gaining a complete understanding of the complex regulations and enzymatic functions of Parkin. These studies will not only highlight the important residues, but will also help to develop novel therapeutics aimed at activating and preserving an active, neuroprotective form of Parkin.
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida.
Fabienne C
FC
Fiesel
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida.
Thomas R
TR
Caulfield
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida.
Elisabeth L
EL
Moussaud-Lamodière
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida.
Kotaro
K
Ogaki
Department of Cell & Molecular Biology, Computational & Systems Biology, Uppsala University, Uppsala, Sweden.
Daniel F A R
DF
Dourado
Department of Cell & Molecular Biology, Computational & Systems Biology, Uppsala University, Uppsala, Sweden.
Samuel C
SC
Flores
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida.|Mayo Graduate School, Neurobiology of Disease, Mayo Clinic, Jacksonville, Florida.
Owen A
OA
Ross
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida.|Mayo Graduate School, Neurobiology of Disease, Mayo Clinic, Jacksonville, Florida.
Wolfdieter
W
Springer
D006367:HeLa Cells; D006801:Humans; D008958:Models, Molecular; D009154:Mutation; D010300:Parkinson Disease / Q000235:genetics* / Q000378:metabolism; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
D020033:Protein Isoforms; D044767:Ubiquitin-Protein Ligases; C111567:parkin protein
EOPD; PARK2; PINK1; Parkinson; mitophagy; molecular dynamics