National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM149542
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM118396
米国
National Institutes of Health/Office of the Director
S10OD032290
米国
引用
ジャーナル: Nat Nanotechnol / 年: 2024 タイトル: De novo design of pH-responsive self-assembling helical protein filaments. 著者: Hao Shen / Eric M Lynch / Susrut Akkineni / Joseph L Watson / Justin Decarreau / Neville P Bethel / Issa Benna / William Sheffler / Daniel Farrell / Frank DiMaio / Emmanuel Derivery / James J ...著者: Hao Shen / Eric M Lynch / Susrut Akkineni / Joseph L Watson / Justin Decarreau / Neville P Bethel / Issa Benna / William Sheffler / Daniel Farrell / Frank DiMaio / Emmanuel Derivery / James J De Yoreo / Justin Kollman / David Baker / 要旨: Biological evolution has led to precise and dynamic nanostructures that reconfigure in response to pH and other environmental conditions. However, designing micrometre-scale protein nanostructures ...Biological evolution has led to precise and dynamic nanostructures that reconfigure in response to pH and other environmental conditions. However, designing micrometre-scale protein nanostructures that are environmentally responsive remains a challenge. Here we describe the de novo design of pH-responsive protein filaments built from subunits containing six or nine buried histidine residues that assemble into micrometre-scale, well-ordered fibres at neutral pH. The cryogenic electron microscopy structure of an optimized design is nearly identical to the computational design model for both the subunit internal geometry and the subunit packing into the fibre. Electron, fluorescent and atomic force microscopy characterization reveal a sharp and reversible transition from assembled to disassembled fibres over 0.3 pH units, and rapid fibre disassembly in less than 1 s following a drop in pH. The midpoint of the transition can be tuned by modulating buried histidine-containing hydrogen bond networks. Computational protein design thus provides a route to creating unbound nanomaterials that rapidly respond to small pH changes.