A nanofiber assembly directed by the non-classical antiparallel β-structure from 4S-(OH) proline polypeptide

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Structural Biology

Background:

• The self-assembly of polypeptide chains into ordered structures is crucial for biological functions and biomaterial design.
• Understanding the structural basis of self-assembly, particularly for non-classical structures, is key to controlling material properties.

Purpose of the Study:

• To investigate the self-assembly behavior of cis-4S-(OH) prolyl polypeptide.
• To determine the structural arrangement of the polypeptide and its self-assembled nanostructures.
• To explore the influence of hydrocarbon chain conjugation on nanofiber formation.

Main Methods:

• Förster Resonance Energy Transfer (FRET) was used to establish the antiparallel arrangement of the polypeptide strands.
• Conjugation of the polypeptide with varying lengths of hydrocarbon chains (C12, C14, C16) was performed.
• Nanofiber formation was characterized using techniques suitable for self-assembled nanomaterials.

Main Results:

• The cis-4S-(OH) prolyl polypeptide exclusively forms an antiparallel arrangement of two strands, creating a non-classical beta-structure.
• This defined structural unit successfully propagates into self-assembled nanofibers upon conjugation with C12, C14, or C16 hydrocarbon chains.
• The hydrocarbon chains facilitate the transition from molecular structure to supramolecular nanofiber assembly.

Conclusions:

• The study elucidates the specific structural basis for the self-assembly of cis-4S-(OH) prolyl polypeptide into nanofibers.
• The findings demonstrate a rational design approach for creating peptide-based nanomaterials with controlled structures.
• This work contributes to the field of peptide self-assembly and the development of novel functional biomaterials.