7TA3

Trimer-to-Monomer Disruption of Tumor Necrosis Factor-alpha (TNF-alpha) by alpha-peptide-3

7TA3 の概要

• エントリーDOI: 10.2210/pdb7ta3/pdb
• 分子名称: Alpha-peptide-3, Tumor necrosis factor (3 entities in total)
• 機能のキーワード: tumor necrosis factor-alpha, signaling, signaling protein
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 42123.51

構造登録者

Niu, J.,Bingman, C.A.,Gellman, S.H. (登録日: 2021-12-20, 公開日: 2022-06-29, 最終更新日: 2024-11-20)

主引用文献

Niu, J.,Cederstrand, A.J.,Eddinger, G.A.,Yin, B.,Checco, J.W.,Bingman, C.A.,Outlaw, V.K.,Gellman, S.H.
Trimer-to-Monomer Disruption Mechanism for a Potent, Protease-Resistant Antagonist of Tumor Necrosis Factor-alpha Signaling.
J.Am.Chem.Soc., 144:9610-9617, 2022

PubMed Abstract: Aberrant tumor necrosis factor-α (TNFα) signaling is associated with many inflammatory diseases. The homotrimeric quaternary structure of TNFα is essential for receptor recognition and signal transduction. Previously, we described an engineered α/β-peptide inhibitor that potently suppresses TNFα activity and resists proteolysis. Here, we present structural evidence that both the α/β-peptide inhibitor and an all-α analogue bind to a monomeric form of TNFα. Calorimetry data support a 1:1 inhibitor/TNFα stoichiometry in solution. In contrast, previous cocrystal structures involving peptide or small-molecule inhibitors have shown the antagonists engaging a TNFα dimer. The structural data reveal why our inhibitors favor monomeric TNFα. Previous efforts to block TNFα-induced cell death with peptide inhibitors revealed that surfactant additives to the assay conditions cause a more rapid manifestation of inhibitory activity than is observed in the absence of additives. We attributed this effect to a loose surfactant TNFα association that lowers the barrier to trimer dissociation. Here, we used the new structural data to design peptide inhibitors bearing a surfactant-inspired appendage intended to facilitate TNFα trimer dissociation. The appendage modified the time course of protection from cell death.

PubMed: 35613436
DOI: 10.1021/jacs.1c13717

実験手法

X-RAY DIFFRACTION (2.5 Å)