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• W2891879880 abstract "Missense mutations in the coding region of d-amino acid oxidase (DAO) have been found in patients suffering from amyotrophic lateral sclerosis (ALS). Mutations primarily impair the enzymatic activity of DAO and cause neurodegeneration due to an abnormal accumulation of d-serine in the spinal cord. However, the structural and dynamic changes that lead to impaired enzymatic activity are not fully understood. We present here extensive molecular dynamics simulations of wild-type, and all reported ALS-associated DAO mutants to elucidate the plausible mechanisms of impaired enzymatic activity, a critical function needed for neuroprotection. Simulation results show that DAO mutations disrupt several key interactions with the active site residues and decrease the conformational flexibility of active site loop comprising 216 to 228 residues, necessary for substrate binding and product release. This conformational restriction of the active site loop in the mutants is mainly due to the distortion of critical salt bridge and hydrogen bond interactions compared with wild-type. Furthermore, binding free energy calculations show that DAO mutants have a lower binding affinity toward cofactor flavin adenine dinucleotide and substrate imino-serine than the wild-type. A closer look at the cofactor and substrate interaction profiles further show that DAO mutants have lost several critical interactions with the neighboring residues as compared with wild-type. Taken together, this study provides first-hand explanation of crucial structural features that lead to the loss of enzymatic function in DAO mutants and highlights the need of further genomic scans of patients with ALS to map the association of novel DAO variants in ALS pathophysiology." @default.
• W2891879880 created "2018-09-27" @default.
• W2891879880 creator A5004462439 @default.
• W2891879880 creator A5080510069 @default.
• W2891879880 date "2018-09-11" @default.
• W2891879880 modified "2023-10-05" @default.
• W2891879880 title "Insights into the role of <scp>d</scp> ‐amino acid oxidase mutations in amyotrophic lateral sclerosis" @default.
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• W2891879880 doi "https://doi.org/10.1002/jcb.27529" @default.
• W2891879880 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30206963" @default.
• W2891879880 hasPublicationYear "2018" @default.
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