Abstract:
:Mitochondrial (mt) diseases are multisystem disorders due to mutations in nuclear or mtDNA genes. Among the latter, more than 50% are located in transfer RNA (tRNA) genes and are responsible for a wide range of syndromes, for which no effective treatment is available at present. We show that three human mt aminoacyl-tRNA syntethases, namely leucyl-, valyl-, and isoleucyl-tRNA synthetase are able to improve both viability and bioenergetic proficiency of human transmitochondrial cybrid cells carrying pathogenic mutations in the mt-tRNA(Ile) gene. Importantly, we further demonstrate that the carboxy-terminal domain of human mt leucyl-tRNA synthetase is both necessary and sufficient to improve the pathologic phenotype associated either with these "mild" mutations or with the "severe" m.3243A>G mutation in the mt-tRNA(L)(eu(UUR)) gene. Furthermore, we provide evidence that this small, non-catalytic domain is able to directly and specifically interact in vitro with human mt-tRNA(Leu(UUR)) with high affinity and stability and, with lower affinity, with mt-tRNA(Ile). Taken together, our results sustain the hypothesis that the carboxy-terminal domain of human mt leucyl-tRNA synthetase can be used to correct mt dysfunctions caused by mt-tRNA mutations.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Perli E,Giordano C,Pisano A,Montanari A,Campese AF,Reyes A,Ghezzi D,Nasca A,Tuppen HA,Orlandi M,Di Micco P,Poser E,Taylor RW,Colotti G,Francisci S,Morea V,Frontali L,Zeviani M,d'Amati Gdoi
10.1002/emmm.201303198subject
Has Abstractpub_date
2014-02-01 00:00:00pages
169-82issue
2eissn
1757-4676issn
1757-4684pii
emmm.201303198journal_volume
6pub_type
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