EMD-42070

Helical reconstruction
3.6 Å
EMD-42070 Deposition: 21/09/2023
Map released: 10/04/2024
Last modified: 07/08/2024
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links

EMD-42070

DpHF18 filament

EMD-42070

Helical reconstruction
3.6 Å
EMD-42070 Deposition: 21/09/2023
Map released: 10/04/2024
Last modified: 07/08/2024
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Sample Organism: synthetic construct
Sample: DpHF18
Fitted models: 8uao (Avg. Q-score: 0.41)

Deposition Authors: Lynch EM , Shen H , Kollman JM, Baker D
De novo design of pH-responsive self-assembling helical protein filaments.
PUBMED: 38570702
DOI: doi:10.1038/s41565-024-01641-1
ISSN: 1748-3395
Abstract:
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.