Interplay between Silk Fibroin's Structure and Its Adhesive Properties

Erik R. Johnston, Yu Miyagi, Jo Ann Chuah, Keiji Numata, Monica A. Serban

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Bombyx mori-derived silk fibroin (SF) is a well-characterized protein employed in numerous biomedical applications. Structurally, SF consists of a heavy chain and a light chain connected via a single disulfide bond. The HC sequence is organized into 12 crystalline domains interspersed with amorphous regions that can transition between random coil/α-helix and beta-sheet configurations, giving silk its hallmark properties. SF has been reported to have adhesive properties and shows promise for development of medical adhesives; however, the mechanism of these interactions and the interplay between SF's structure and adhesion are not understood. In this context, the effects of physical parameters (i.e., concentration, temperature, pH, and ionic strength) and protein structural changes on adhesion were investigated in this study. Our results suggest that amino acid side chains that have functionalities capable of coordinate (dative) bond or hydrogen bond formation (such as those of serine and tyrosine) might be important determinants in SF's adhesion to a given substrate. Additionally, the data suggest that fibroin amino acids involved in beta-sheet formation are also important in the protein's adhesion to substrates.

Original languageEnglish
Pages (from-to)2815-2824
Number of pages10
JournalACS Biomaterials Science and Engineering
Volume4
Issue number8
DOIs
StatePublished - Aug 13 2018

Keywords

  • adhesion
  • physical interactions
  • silk fibroin
  • structural changes

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