Ghrelin is a 28-residue peptide hormone produced by stomach P/D1 cells located in oxyntic glands of the fundus mucosa. Post-translational octanoylation of its Ser-3 residue, catalyzed by MBOAT4 (aka ghrelin O-acyl transferase (GOAT)), is essential for the binding of the hormone to its receptor in target tissues. Physiological roles of acyl ghrelin include the regulation of food intake, growth hormone secretion from the pituitary, and inhibition of insulin secretion from the pancreas. Here, we describe a medicinal chemistry campaign that led to the identification of small lipopeptidomimetics that inhibit GOAT in vitro. These molecules compete directly for substrate binding. We further describe the synthesis of heterocyclic inhibitors that compete at the acyl coenzyme A binding site.
胃饥饿素是由位于胃底粘膜的氧化腺中的P/D1细胞产生的一种由28个氨基酸残基组成的肽激素。通过MBOAT4(也称为胃饥饿素O-酰基转移酶(GOAT))催化其Ser-3残基的后转录辛酰化是该激素与靶组织中的受体结合所必需的。酰基饥饿素的生理作用包括调节食物摄入、促使垂体分泌生长激素以及抑制胰腺分泌胰岛素。在这里,我们描述了一项药物化学研究,该研究导致了对抑制体外GOAT的小型脂肽类似物的鉴定。这些分子直接竞争底物结合。我们进一步描述了在酰基辅酶A结合位点上竞争的杂环抑制剂的合成。