Structure of a bacterial ice binding protein with two faces of interaction with ice

Marco Mangiagalli, Guy Sarusi, Aleksei Kaleda, Maya Bar Dolev, Valentina Nardone, Vittoria Federica Vena, Ido Braslavsky, Marina Lotti*, Marco Nardini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Ice-binding proteins (IBPs) contribute to the survival of many living beings at subzero temperature by controlling the formation and growth of ice crystals. This work investigates the structural basis of the ice-binding properties of EfcIBP, obtained from Antarctic bacteria. EfcIBP is endowed with a unique combination of thermal hysteresis and ice recrystallization inhibition activity. The three-dimensional structure, solved at 0.84 Å resolution, shows that EfcIBP belongs to the IBP-1 fold family, and is organized in a right-handed β-solenoid with a triangular cross-section that forms three protein surfaces, named A, B, and C faces. However, EfcIBP diverges from other IBP-1 fold proteins in relevant structural features including the lack of a ‘capping’ region on top of the β-solenoid, and in the sequence and organization of the regions exposed to ice that, in EfcIBP, reveal the presence of threonine-rich ice-binding motifs. Docking experiments and site-directed mutagenesis pinpoint that EfcIBP binds ice crystals not only via its B face, as common to other IBPs, but also via ice-binding sites on the C face. Database: Coordinates and structure factors have been deposited in the Protein Data Bank under accession number 6EIO.

Original languageAmerican English
Pages (from-to)1653-1666
Number of pages14
JournalFEBS Journal
Volume285
Issue number9
DOIs
StatePublished - May 2018

Bibliographical note

Publisher Copyright:
© 2018 Federation of European Biochemical Societies

Keywords

  • DUF3494
  • IBP-1 fold
  • cold adaptation
  • ice recrystallization inhibition
  • thermal hysteresis

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