Hubbard Basil P, Sinclair David A
Department of Genetics, Harvard Medical School, Boston, MA, USA.
Methods Mol Biol. 2013;1077:167-77. doi: 10.1007/978-1-62703-637-5_11.
The sirtuins are NAD(+)-dependent, multifunctional lysine deacylases that play key roles in cellular homeostasis. They are increasingly being found to target a variety of substrates including acetyl-, butyryl-, malonyl-, and succinyl-lysines. Early assays for measuring sirtuin activity in vitro were criticized for their use of fluorophores on the peptide substrates used, which may alter the results obtained and not be representative of the in vivo situation. We describe a new protocol for the measurement of sirtuin activity by detecting the production of nicotinamide (NAM). The assay is amenable to any substrate and any modification removed by sirtuins. The assay may also be used to measure glycohydrolase (e.g., CD38) and ADP-ribosyltransferase activity (e.g., mARTs and PARPs).
沉默调节蛋白是依赖烟酰胺腺嘌呤二核苷酸(NAD⁺)的多功能赖氨酸脱酰基酶,在细胞内稳态中发挥关键作用。人们越来越多地发现它们作用于多种底物,包括乙酰赖氨酸、丁酰赖氨酸、丙二酰赖氨酸和琥珀酰赖氨酸。早期用于体外测量沉默调节蛋白活性的检测方法受到批评,因为其在所用肽底物上使用了荧光团,这可能会改变所得结果,且不能代表体内情况。我们描述了一种通过检测烟酰胺(NAM)的产生来测量沉默调节蛋白活性的新方法。该检测方法适用于任何底物以及沉默调节蛋白去除的任何修饰。该检测方法还可用于测量糖水解酶(如CD38)和ADP - 核糖基转移酶活性(如mARTs和PARP)。