Effect of pH on the Activity of Ice-Binding Protein from Marinomonas primoryensis

Elizabeth Delesky, Patrick Thomas, Marimikel Charrier, Jeffrey Cameron, Wil Srubar III

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations

Abstract

The ability of an ice-binding protein (IBP) from Marinomonas primoryensis (MpIBP) to influence ice crystal growth and structure in nonphysiological pH environments was investigated in this work. The ability for MpIBP to retain ice interactivity under stressed environmental conditions was determined via (1) a modified splat assay to determine ice recrystallization inhibition (IRI) of polycrystalline ice and (2) nanoliter osmometry to evaluate the ability of MpIBP to dynamically shape the morphology of a single ice crystal. Circular dichroism (CD) was used to relate the IRI and DIS activity of MpIBP to secondary structure. The results illustrate that MpIBP secondary structure was stable between pH 6 and pH 10. It was found that MpIBP did not interact with ice at pH=4 or pH=13. At 6=pH=12 MpIBP exhibited a reduction in grain size of ice crystals as compared to control solutions and demonstrated dynamic ice shaping at 6=pH=10. The results substantiate that MpIBP retains some secondary structure and function in non-neutral pH environments; thereby, enabling its potential utility in nonphysiological materials science and engineering applications.
Original languageAmerican English
Number of pages13
JournalExtremophiles
Volume25
DOIs
StatePublished - 2021

NREL Publication Number

  • NREL/JA-2800-78279

Keywords

  • antifreeze proteins
  • dynamic ice shaping
  • ice recrystallization inhibition
  • ice-binding proteins
  • pH

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