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Molecular Dynamics studies on the effects of Antifreezing Protein from Rhagium inquisitor (RiAFP) on Ice Growth

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  • KIMATSUKA Masato
    Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
  • SATO Ryuma
    Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577 Japan Center for Biosystems Dynamics Research, 6-2-3 Furuedai, Suita, Osaka 565-0874, Japan/
  • HARADA Ryuhei
    Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577 Japan
  • SHOJI Mitsuo
    Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577 Japan
  • SHIGETA Yasuteru
    Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577 Japan

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Other Title
  • 分子動力学シミュレーションによる不凍タンパク質RiAFPの氷の結晶成長に及ぼす影響の解析

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Abstract

<p>Antifreezing nature of an antifreezing proteins (AFPs) from Rhagium inquisitor, RiAFP, was assessed by means of molecular dynamics (MD) simulations of RiAFP adsorbing ice surface in water below melting temperature to investigate how RiAFP affects the way of ice growth. We found that the ice growth toward the horizontal direction is accelerated, while that toward the vertical direction is suppressed due to the RiAFP binding on the nascent ice surface. We also showed that a mutant of RiAFP, where all Thr are replaced by Gly, resulted in loss of antifreezing effects due to weaker binding to the ice surface though the structure of the mutant is stable in aqueous solution at the room temperature.</p>

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