ANKRD16 prevents neuron loss caused by an editing-defective tRNA synthetase.
Nature
; 557(7706): 510-515, 2018 05.
Article
en En
| MEDLINE
| ID: mdl-29769718
ABSTRACT
Editing domains of aminoacyl tRNA synthetases correct tRNA charging errors to maintain translational fidelity. A mutation in the editing domain of alanyl tRNA synthetase (AlaRS) in Aars sti mutant mice results in an increase in the production of serine-mischarged tRNAAla and the degeneration of cerebellar Purkinje cells. Here, using positional cloning, we identified Ankrd16, a gene that acts epistatically with the Aars sti mutation to attenuate neurodegeneration. ANKRD16, a vertebrate-specific protein that contains ankyrin repeats, binds directly to the catalytic domain of AlaRS. Serine that is misactivated by AlaRS is captured by the lysine side chains of ANKRD16, which prevents the charging of serine adenylates to tRNAAla and precludes serine misincorporation in nascent peptides. The deletion of Ankrd16 in the brains of Aarssti/sti mice causes widespread protein aggregation and neuron loss. These results identify an amino-acid-accepting co-regulator of tRNA synthetase editing as a new layer of the machinery that is essential to the prevention of severe pathologies that arise from defects in editing.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Células de Purkinje
/
Biosíntesis de Proteínas
/
Alanina-ARNt Ligasa
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Mutación
Límite:
Animals
Idioma:
En
Revista:
Nature
Año:
2018
Tipo del documento:
Article
País de afiliación:
Estados Unidos