Selective stalling of human translation through small-molecule engagement of the ribosome nascent chain
作者:Nathanael G. Lintner、Kim F. McClure、Donna Petersen、Allyn T. Londregan、David W. Piotrowski、Liuqing Wei、Jun Xiao、Michael Bolt、Paula M. Loria、Bruce Maguire、Kieran F. Geoghegan、Austin Huang、Tim Rolph、Spiros Liras、Jennifer A. Doudna、Robert G. Dullea、Jamie H. D. Cate
DOI:10.1371/journal.pbio.2001882
日期:——
Proprotein convertase subtilisin/kexin type 9 (PCSK9) plays a key role in regulating the levels of plasma low-density lipoprotein cholesterol (LDL-C). Here, we demonstrate that the compound PF-06446846 inhibits translation of PCSK9 by inducing the ribosome to stall around codon 34, mediated by the sequence of the nascent chain within the exit tunnel. We further show that PF-06446846 reduces plasma PCSK9 and total cholesterol levels in rats following oral dosing. Using ribosome profiling, we demonstrate that PF-06446846 is highly selective for the inhibition of PCSK9 translation. The mechanism of action employed by PF-06446846 reveals a previously unexpected tunability of the human ribosome that allows small molecules to specifically block translation of individual transcripts.
前蛋白转化酶枯草杆菌蛋白酶/kexin 9型(PCSK9)在调节血浆低密度脂蛋白胆固醇(LDL-C)水平中起关键作用。在这里,我们证明化合物PF-06446846通过诱导核糖体在密码子34附近停滞,介导了出口隧道中新合成链的序列,从而抑制了PCSK9的翻译。我们进一步显示,PF-06446846在口服给药后降低了大鼠血浆中的PCSK9和总胆固醇水平。通过使用核糖体分析技术,我们证明了PF-06446846对抑制PCSK9翻译具有高度的选择性。PF-06446846的机制揭示了一个先前未预料到的人类核糖体的可调性,这使得小分子能够特异性地阻断单个转录本的翻译。