9FCK

3D Cryo-EM reveals the structure of a 3-Fmoc zipper motif ensuring the self-assembly of tripeptide nanofiber

9FCK の概要

• エントリーDOI: 10.2210/pdb9fck/pdb
• EMDBエントリー: 50318
• 分子名称: FMO-PHE-PHE-TYR (1 entity in total)
• 機能のキーワード: nanofiber, biosynthetic protein
• 由来する生物種: synthetic construct
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 1432.44

構造登録者

Estrozi, L.F.,Jierry, L. (登録日: 2024-05-15, 公開日: 2024-11-06, 最終更新日: 2024-11-13)

主引用文献

Bigo-Simon, A.,Estrozi, L.F.,Chaumont, A.,Schurhammer, R.,Schoehn, G.,Combet, J.,Schmutz, M.,Schaaf, P.,Jierry, L.
3D Cryo-Electron Microscopy Reveals the Structure of a 3-Fluorenylmethyloxycarbonyl Zipper Motif Ensuring the Self-Assembly of Tripeptide Nanofibers.
Acs Nano, 18:30448-30462, 2024

PubMed Abstract: Short peptide-based supramolecular hydrogels appeared as highly interesting materials for applications in many fields. The optimization of their properties relies mainly on the design of a suitable hydrogelator through an empirical trial-and-error strategy based on the synthesis of various types of peptides. This approach is in part due to the lack of prior structural knowledge of the molecular architecture of the various families of nanofibers. The 3D structure of the nanofibers determines their ability to interact with entities present in their surrounding environment. Thus, it is important to resolve the internal structural organization of the material. Herein, using Fmoc-FFY tripeptide as a model amphiphilic hydrogelator and cryo-EM reconstruction approach, we succeeded to obtain a 3.8 Å resolution 3D structure of a self-assembled nanofiber with a diameter of approximately 4.1 nm and with apparently "infinite" length. The elucidation of the spatial organization of such nano-objects addresses fundamental questions about the way short amphiphilic -Fmoc peptides lacking secondary structure can self-assemble and ensure the cohesion of such a lengthy nanostructure. This nanofiber is organized into a triple-stranded helix with an asymmetric unit composed of two Fmoc-FFY peptides per strand. The three identical amphiphilic strands are maintained together by strong lateral interactions coming from a 3-Fmoc zipper motif. This hydrophobic core of the nanofiber is surrounded by 12 phenyl groups from phenylalanine residues, nonplanar with the six Fmoc groups. Polar tyrosine residues at the C-term position constitute the hydrophilic shell and are exposed all around the external part of the assembly. This fiber has a highly hydrophobic central core with an internal diameter of only 2.4 Å. Molecular dynamics simulations highlight van der Waals and hydrogen bonds between peptides placed on top of each other. We demonstrate that the self-assembly of Fmoc-FFY, whether induced by annealing or by the action of a phosphatase on the phosphorylated precursor Fmoc-FFY, results in two nanostructures with minor differences that we are unable to distinguish.

PubMed: 39441741
DOI: 10.1021/acsnano.4c08043

実験手法

ELECTRON MICROSCOPY (3.8 Å)