ジャーナル: Nature / 年: 2024 タイトル: De novo design of allosterically switchable protein assemblies. 著者: Arvind Pillai / Abbas Idris / Annika Philomin / Connor Weidle / Rebecca Skotheim / Philip J Y Leung / Adam Broerman / Cullen Demakis / Andrew J Borst / Florian Praetorius / David Baker / 要旨: Allosteric modulation of protein function, wherein the binding of an effector to a protein triggers conformational changes at distant functional sites, plays a central part in the control of ...Allosteric modulation of protein function, wherein the binding of an effector to a protein triggers conformational changes at distant functional sites, plays a central part in the control of metabolism and cell signalling. There has been considerable interest in designing allosteric systems, both to gain insight into the mechanisms underlying such 'action at a distance' modulation and to create synthetic proteins whose functions can be regulated by effectors. However, emulating the subtle conformational changes distributed across many residues, characteristic of natural allosteric proteins, is a significant challenge. Here, inspired by the classic Monod-Wyman-Changeux model of cooperativity, we investigate the de novo design of allostery through rigid-body coupling of peptide-switchable hinge modules to protein interfaces that direct the formation of alternative oligomeric states. We find that this approach can be used to generate a wide variety of allosterically switchable systems, including cyclic rings that incorporate or eject subunits in response to peptide binding and dihedral cages that undergo effector-induced disassembly. Size-exclusion chromatography, mass photometry and electron microscopy reveal that these designed allosteric protein assemblies closely resemble the design models in both the presence and absence of peptide effectors and can have ligand-binding cooperativity comparable to classic natural systems such as haemoglobin. Our results indicate that allostery can arise from global coupling of the energetics of protein substructures without optimized side-chain-side-chain allosteric communication pathways and provide a roadmap for generating allosterically triggerable delivery systems, protein nanomachines and cellular feedback control circuitry.
名称: sr322 / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Complex is made up of 4 monomeric proteins, and is purified as a 4 sided multimer sr322. In this structure two copies of sr322 interact in an off target way.
由来(天然)
生物種: synthetic construct (人工物)
分子量
理論値: 326.592 KDa
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分子 #1: de novo protein sr322
分子
名称: de novo protein sr322 / タイプ: protein_or_peptide / ID: 1 / コピー数: 8 / 光学異性体: LEVO