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Structure-based characterization and antifreeze properties of a hyperactive ice-binding protein (FfIBP) from the Antarctic bacterium Flavobacterium frigoris PS1

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Title
Structure-based characterization and antifreeze properties of a hyperactive ice-binding protein (FfIBP) from the Antarctic bacterium Flavobacterium frigoris PS1
Authors
Do, Hackwon
Kim, Soon-Jong
Kim, Hak Jun
Lee, Jun Hyuck
Subject
Ice-binding protein; FfIBP
Issue Date
2014
Citation
Do, Hackwon., et al. 2014. Structure-based characterization and antifreeze properties of a hyperactive ice-binding protein (FfIBP) from the Antarctic bacterium Flavobacterium frigoris PS1. 32rd Congress and General Assembly of the International Union of Crystallography (IUCr), Palais des congres (Convention Centre), Canada. 2014.08.05.-12.
Abstract
Ice-binding proteins (IBPs) inhibit ice growth through direct interaction with ice crystals to permit the survival of polar organisms in extremely cold environments. FfIBP is an ice- binding protein encoded by the Antarctic bacterium Flavobacterium frigoris PS1. The X-ray crystal structure of FfIBP was determined to 2.1 Å resolution to gain insight into its ice- binding mechanism. The refined structure of FfIBP shows an intramolecular disulfide bond, and analytical ultracentrifugation and analytical size-exclusion chromatography show that it behaves as a monomer in solution. Sequence alignments and structural comparisons of IBPs allowed two groups of IBPs to be defined, depending on sequence differences between the β2 and β4 loop regions and the presence of the disulfide bond. Although FfIBP closely resembles Leucosporidium (recently re-classified as Glaciozyma) IBP (LeIBP) in its amino-acid sequence, the thermal hysteresis (TH) activity of FfIBP appears to be ten-fold higher than that of LeIBP. A comparison of the FfIBP and LeIBP structures reveals that FfIBP has different ice-binding residues as well as a greater surface area in the ice-binding site. Notably, the ice-binding site of FfIBP is composed of a T-A/G-X-T/N motif, which is similar to the ice-binding residues of hyperactive antifreeze proteins. Thus, it is proposed that the difference in TH activity between FfIBP and LeIBP may arise from the amino-acid composition of the ice-binding site, which correlates with differences in affinity and surface complementarity to the ice crystal.
Conference Name
Palais des congres (Convention Centre)
Conference Place
Canada
Conference Date
2014.08.05.-12.
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