A minimalistic cyclic ice-binding peptide from phage display

Nat Commun. 2021 May 11;12(1):2675. doi: 10.1038/s41467-021-22883-w.

Abstract

Developing molecules that emulate the properties of naturally occurring ice-binding proteins (IBPs) is a daunting challenge. Rather than relying on the (limited) existing structure-property relationships that have been established for IBPs, here we report the use of phage display for the identification of short peptide mimics of IBPs. To this end, an ice-affinity selection protocol is developed, which enables the selection of a cyclic ice-binding peptide containing just 14 amino acids. Mutational analysis identifies three residues, Asp8, Thr10 and Thr14, which are found to be essential for ice binding. Molecular dynamics simulations reveal that the side chain of Thr10 hydrophobically binds to ice revealing a potential mechanism. To demonstrate the biotechnological potential of this peptide, it is expressed as a fusion ('Ice-Tag') with mCherry and used to purify proteins directly from cell lysate.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acids / chemistry
  • Amino Acids / genetics
  • Amino Acids / metabolism
  • Antifreeze Proteins / chemistry
  • Antifreeze Proteins / genetics*
  • Antifreeze Proteins / metabolism
  • Base Sequence
  • Binding Sites / genetics
  • Cell Surface Display Techniques / methods*
  • Crystallization
  • Hydrophobic and Hydrophilic Interactions
  • Ice
  • Molecular Dynamics Simulation
  • Mutation*
  • Peptides, Cyclic / chemistry
  • Peptides, Cyclic / genetics*
  • Peptides, Cyclic / metabolism
  • Protein Binding
  • Protein Structure, Tertiary
  • Sequence Homology, Amino Acid

Substances

  • Amino Acids
  • Antifreeze Proteins
  • Ice
  • Peptides, Cyclic