Abstract |
Biallelic missense mutations in MARS are responsible for rare but severe cases of pulmonary alveolar proteinosis (PAP) prevalent on the island of La Réunion. MARS encodes cytosolic methionyl-tRNA synthetase (MetRS), an essential translation factor. The multisystemic effects observed in patients with this form of PAP are consistent with a loss-of-function defect in an ubiquitously expressed enzyme. The pathophysiological mechanisms involved in MARS-related PAP are currently unknown. In this work, we analyzed the effect of the PAP-related mutations in MARS on the thermal stability and on the catalytic parameters of the MetRS mutants, relative to wild-type. The effect of these mutations on the structural integrity of the enzyme as a member of the cytosolic multisynthetase complex was also investigated. Our results establish that the PAP-related substitutions in MetRS impact the tRNAMet -aminoacylation reaction especially at the level of methionine recognition, and suggest a direct link between the loss of activity of the enzyme and the pathological disorders in PAP.
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Authors | Martine Comisso, Alice Hadchouel, Jacques de Blic, Marc Mirande |
Journal | The FEBS journal
(FEBS J)
Vol. 285
Issue 14
Pg. 2654-2661
(07 2018)
ISSN: 1742-4658 [Electronic] England |
PMID | 29775242
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | © 2018 Federation of European Biochemical Societies. |
Chemical References |
- RNA, Transfer, Met
- Recombinant Proteins
- Methionine
- MARS1 protein, human
- Methionine-tRNA Ligase
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Topics |
- Amino Acid Sequence
- Animals
- Binding Sites
- Cloning, Molecular
- Escherichia coli
(genetics, metabolism)
- Gene Expression
- Genetic Vectors
(chemistry, metabolism)
- Humans
- Methionine
(chemistry, metabolism)
- Methionine-tRNA Ligase
(chemistry, genetics, metabolism)
- Models, Molecular
- Mutagenesis, Site-Directed
- Mutation
- Protein Binding
- Protein Conformation, alpha-Helical
- Protein Conformation, beta-Strand
- Protein Interaction Domains and Motifs
- Pulmonary Alveolar Proteinosis
(genetics, metabolism, pathology)
- RNA, Transfer, Met
(genetics, metabolism)
- Recombinant Proteins
(chemistry, genetics, metabolism)
- Sequence Alignment
- Sequence Homology, Amino Acid
- Substrate Specificity
- Transfer RNA Aminoacylation
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