The human Sir2 ortholog, SIRT2, is an NAD+-dependent tubulin deacetylase.
Article Details
- CitationCopy to clipboard
North BJ, Marshall BL, Borra MT, Denu JM, Verdin E
The human Sir2 ortholog, SIRT2, is an NAD+-dependent tubulin deacetylase.
Mol Cell. 2003 Feb;11(2):437-44.
- PubMed ID
- 12620231 [ View in PubMed]
- Abstract
The silent information regulator 2 protein (Sir2p) of Saccharomyces cerevisiae is an NAD-dependent histone deacetylase that plays a critical role in transcriptional silencing. Here, we report that a human ortholog of Sir2p, sirtuin type 2 (SIRT2), is a predominantly cytoplasmic protein that colocalizes with microtubules. SIRT2 deacetylates lysine-40 of alpha-tubulin both in vitro and in vivo. Knockdown of SIRT2 via siRNA results in tubulin hyperacetylation. SIRT2 colocalizes and interacts in vivo with HDAC6, another tubulin deacetylase. Enzymatic analysis of recombinant SIRT2 in comparison to a yeast homolog of Sir2 protein (Hst2p) shows a striking preference of SIRT2 for acetylated tubulin peptide as a substrate relative to acetylated histone H3 peptide. These observations establish SIRT2 as a bona fide tubulin deacetylase.