Structural Impact of Three Parkinsonism-Associated Missense Mutations on Human DJ-1

A number of missense mutations in the oxidative stress response protein DJ-1 are implicated in rare forms of familial Parkinsonism. The best-characterized Parkinsonian DJ-1 missense mutation, L166P, disrupts homodimerization and results in a poorly folded protein. The molecular basis by which the ot...

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Bibliographic Details
Published in:Biochemistry (Easton) 2008-02, Vol.47 (5), p.1381-1392
Main Authors: Lakshminarasimhan, Mahadevan, Maldonado, Marien T, Zhou, Wenbo, Fink, Anthony L, Wilson, Mark A
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Crystallization
Crystallography, X-Ray
Dimerization
Humans
Hydrogen Bonding
Intracellular Signaling Peptides and Proteins - chemistry
Intracellular Signaling Peptides and Proteins - genetics
Mutation, Missense
Oncogene Proteins - chemistry
Oncogene Proteins - genetics
Parkinsonian Disorders - genetics
Protein Deglycase DJ-1
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Summary:A number of missense mutations in the oxidative stress response protein DJ-1 are implicated in rare forms of familial Parkinsonism. The best-characterized Parkinsonian DJ-1 missense mutation, L166P, disrupts homodimerization and results in a poorly folded protein. The molecular basis by which the other Parkinsonism-associated mutations disrupt the function of DJ-1, however, is incompletely understood. In this study we show that three different Parkinsonism-associated DJ-1 missense mutations (A104T, E163K, and M26I) reduce the thermal stability of DJ-1 in solution by subtly perturbing the structure of DJ-1 without causing major folding defects or loss of dimerization. Atomic resolution X-ray crystallography shows that the A104T substitution introduces water and a discretely disordered residue into the core of the protein, E163K disrupts a key salt bridge with R145, and M26I causes packing defects in the core of the dimer. The deleterious effect of each Parkinsonism-associated mutation on DJ-1 is dissected by analysis of engineered substitutions (M26L, A104V, and E163K/R145E) that partially alleviate each of the defects introduced by the A104T, E163K and M26I mutations. In total, our results suggest that the protective function of DJ-1 can be compromised by diverse perturbations in its structural integrity, particularly near the junctions of secondary structural elements.
ISSN:0006-2960
1520-4995
DOI:10.1021/bi701189c