Abstract
Antifreeze proteins (AFPs) are found in a variety of cold-adapted (psychrophilic) organisms to promote survival at subzero temperatures by binding to ice crystals and decreasing the freezing temperature of body fluids. The type III AFPs are small globular proteins that consist of one α-helix, three 310-helices, and two β-strands. Sialic acids play important roles in a variety of biological functions, such as development, recognition, and cell adhesion and are synthesized by conserved enzymatic pathways that include sialic acid synthase (SAS). SAS consists of an N-terminal catalytic domain and a C-terminal antifreeze-like (AFL) domain, which is similar to the type III AFPs. Despite having very similar structures, AFL and the type III AFPs exhibit very different temperature-dependent stability and activity. In this study, we have performed backbone dynamics analyses of a type III AFP (HPLC12 isoform) and the AFL domain of human SAS (hAFL) at various temperatures. We also characterized the structural/dynamic properties of the ice-binding surfaces by analyzing the temperature gradient of the amide proton chemical shift and its correlation with chemical shift deviation from random coil. The dynamic properties of the two proteins were very different from each other. While HPLC12 was mostly rigid with a few residues exhibiting slow motions, hAFL showed fast internal motions at low temperature. Our results provide insight into the molecular basis of thermostability and structural flexibility in homologous psychrophilic HPLC12 and mesophilic hAFL proteins.
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Abbreviations
- AFP:
-
Antifreeze protein
- QAE:
-
Quaternary-amino-ethyl
- SP:
-
Sulfopropyl
- TH:
-
Thermal hysteresis
- IBS:
-
Ice-binding surface
- AFL:
-
Domain antifreeze-like domain
- Sialic acid:
-
N-acetylneuraminic acid
- SAS:
-
Sialic acid synthase
- PEP:
-
Phosphoenolpyruvate
- ManNAc:
-
N-acetylmannosamine
- NeuNAc:
-
N-acetylneuraminic acid
- ManNAc-6P:
-
ManNAc 6-phosphate
- NeuNAc-9P:
-
NeuNAc 9-phosphate
- 3D:
-
Three-dimensional
- CSD:
-
Chemical shift deviation
- H-bond:
-
Hydrogen-bond
- NOE:
-
Nuclear Overhauser effect
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Acknowledgments
This work was supported by several National Research Foundation of Korea (NRF) Grants funded by the Korean Government (MSIP) [2010-0020480, 2013R1A2A2A05003837, 2012R1A4A1027750 (BRL)]. This work was also supported by a Grant from the Next-Generation BioGreen 21 Program (SSAC, No. PJ009041), Rural Development Administration, Korea. We thank the GNU Central Instrument Facility for performing the NMR experiments and Dr. Melissa Stauffer and Miss Laura Mizoue, of Scientific Editing Solutions, for editing the manuscript.
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Yong-Geun Choi and Chin-Ju Park have contributed equally to this work.
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Choi, YG., Park, CJ., Kim, HE. et al. Comparison of backbone dynamics of the type III antifreeze protein and antifreeze-like domain of human sialic acid synthase. J Biomol NMR 61, 137–150 (2015). https://doi.org/10.1007/s10858-014-9895-2
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DOI: https://doi.org/10.1007/s10858-014-9895-2