Reconstitution of the pyridoxal 5′-phosphate (PLP) dependent enzyme serine palmitoyltransferase (SPT) with pyridoxal reveals a crucial role for the phosphate during catalysis
作者:Ashley E. Beattie、David J. Clarke、John M. Wadsworth、Jonathan Lowther、Ho-Lam Sin、Dominic J. Campopiano
DOI:10.1039/c3cc43001d
日期:——
The pyridoxal 5â²-phosphate (PLP)-dependent enzyme serine palmitoyltransferase (SPT) is required for de novo sphingolipid biosynthesis. A previous study revealed a novel and unexpected interaction between the hydroxyl group of the L-serine substrate and the 5â²-phosphate group of PLP. By using pyridoxal (PL), the dephosphorylated analogue of vitamin B6, we show here that this interaction is important for substrate specificity and optimal catalytic efficiency.
丝氨酸棕榈酰基转移酶(SPT)是新鞘脂生物合成所必需的依赖性酶。之前的一项研究发现,L-丝氨酸底物的羟基与 PLP 的 5â²-磷酸基之间存在一种新颖且意想不到的相互作用。通过使用吡哆醛(PL)(维生素 B6 的去磷酸化类似物),我们在此证明这种相互作用对底物特异性和最佳催化效率非常重要。