Estudios científicos

A human tRNA synthetase is a potent PARP1-activating effector target for resveratrol


Resveratrol is reported to extend lifespan and provide cardio-neuro-protective, anti-diabetic, and anti-cancer effects by initiating a stress response that induces survival genes. Because human tyrosyl transfer-RNA (tRNA) synthetase (TyrRS) translocates to the nucleus under stress conditions, we considered the possibility that the tyrosine-like phenolic ring of resveratrol might fit into the active site pocket to effect a nuclear role. Here we present a 2.1 Å co-crystal structure of resveratrol bound to the active site of TyrRS. Resveratrol nullifies the catalytic activity and redirects TyrRS to a nuclear function, stimulating NAD(+)-dependent auto-poly-ADP-ribosylation of poly(ADP-ribose) polymerase 1 (PARP1). Downstream activation of key stress signalling pathways are causally connected to TyrRS-PARP1-NAD(+) collaboration. This collaboration is also demonstrated in the mouse, and is specifically blocked in vivo by a resveratrol-displacing tyrosyl adenylate analogue. In contrast to functionally diverse tRNA synthetase catalytic nulls created by alternative splicing events that ablate active sites, here a non-spliced TyrRS catalytic null reveals a new PARP1- and NAD(+)-dependent dimension to the physiological mechanism of resveratrol. 

Comentarios divulgativos:

El resveratrol extiende la vida útil de las células y proporcionar un efecto protector a nivel cardiovascular, anti-diabéticos y contra el cáncer a través de mecanismos provocados por una respuesta de estrés. Esta carta abierta describe estos mecanismos. 

 Resveratrol is reported to extend lifespan and provide cardiovascular, anti-diabetic and anti-cancer effects through a mechanisms brought on by a stress response. This open letter describes these mechanisms.