Structural Basis of Sirtuin 6 Inhibition by the Hydroxamate Trichostatin A: Implications for Protein Deacylase Drug Development

Protein
lysine deacylases comprise three zinc-dependent families
and the NAD+-dependent sirtuins Sirt1–7, which contribute
to aging-related diseases. Few Sirt6-specific inhibitors are available.
Trichostatin A, which belongs to the potent, zinc-chelating hydroxamate
inhibitors of zinc-dependent deacylases, was recently found to potently
and isoform-specifically inhibit Sirt6. We solved a crystal structure
of a Sirt6/ADP-ribose/trichostatin A complex, which reveals nicotinamide
pocket and acyl channel as binding site and provides interaction details
supporting the development of improved deacylase inhibitors.