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Protein Footprinting and X-ray Crystallography Reveal the Interaction of PD-L1 and a Macrocyclic Peptide.
Biochemistry ( IF 2.9 ) Pub Date : 2019-12-31 , DOI: 10.1021/acs.biochem.9b00822
Ben Niu 1 , Todd C Appleby 2 , Ruth Wang 2 , Mariya Morar 2 , Johannes Voight 2 , Armando G Villaseñor 2 , Sheila Clancy 2 , Sarah Wise 2 , Jean-Philippe Belzile 2 , Giuseppe Papalia 2 , Melanie Wong 2 , Katherine M Brendza 2 , Latesh Lad 2 , Michael L Gross 1
Affiliation  

Blocking interactions between PD-1 and PD-L1 opens a new era of cancer treatment involving immunity modulation. Although most immunotherapies use monoclonal antibodies, small-molecule inhibitors offer advantages. To facilitate development of small-molecule therapeutics, we implemented a rapid approach to characterize the binding interfaces of small-molecule inhibitors with PD-L1. We determined its interaction with a synthetic macrocyclic peptide by using two mass spectrometry-based approaches, hydrogen-deuterium exchange and fast photochemical oxidation of proteins (FPOP), and corroborated the findings with our X-ray structure of the PD-L1/macrocycle complex. Although all three approaches show that the macrocycle binds directly to PD-L1 over the regions of residues 46-87 and 114-125, the two protein footprinting approaches show additional binding at the N-terminus of PD-L1, and FPOP reveals some critical binding residues. The outcomes not only show the binding regions but also demonstrate the utility of MS-based footprinting in probing protein/ligand inhibitory interactions in cancer immunotherapy.

中文翻译:

蛋白质足迹和X射线晶体学揭示了PD-L1和大环肽的相互作用。

PD-1和PD-L1之间的相互作用阻断开启了涉及免疫调节的癌症治疗新纪元。尽管大多数免疫疗法使用单克隆抗体,但小分子抑制剂仍具有优势。为了促进小分子治疗剂的开发,我们实施了一种快速的方法来表征小分子抑制剂与PD-L1的结合界面。我们通过两种基于质谱的方法(氢-氘交换和蛋白质的快速光化学氧化(FPOP))确定了它与合成大环肽的相互作用,并用我们的PD-L1 /大环复合物的X射线结构证实了这一发现。 。尽管所有这三种方法都表明大环化合物在残基46-87和114-125的区域上直接与PD-L1结合,两种蛋白质足迹方法在PD-L1的N端均显示出额外的结合,而FPOP显示出一些关键的结合残基。结果不仅显示了结合区域,而且还证明了基于MS的足迹在探测癌症免疫疗法中蛋白质/配体抑制性相互作用中的实用性。
更新日期:2019-12-31
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