南极鱼抗冻蛋白功能和进化及其应用研究进展
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作者单位:

1. 上海海洋大学, 水产种质资源发掘与利用教育部重点实验室, 上海 201306;
2. 上海海洋大学, 水产科学国家级实验教学示范中心, 上海 201306;
3. 上海海洋大学, 海洋生物科学国际联合研究中心, 上海 201306

作者简介:

张俊芳,教授,从事鱼类环境适应和表观遗传学研究.E-mail:jfzhang@shou.edu.cn

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S93

基金项目:

中国工程院战略研究项目(2018-ZD-08).


Function, evolution, and application of antifreeze proteins in Antarctic fish
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Affiliation:

1. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China;
2. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China;
3. International Research Center for Marine Biosciences, Shanghai Ocean University, Shanghai 201306, China

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    摘要:

    南极海域在大约2000万年降到了零度以下,在大多数鱼类由于无法适应极端寒冷环境而灭绝的情况下,长期生活在极端寒冷、氧气充足的南极海域中的南极鱼亚目(Notothenioids)鱼类由于发生适应性进化而存活下来,并且达120多种类。南极鱼在生化和生理等方面发生了众多适应性改变,抗冻蛋白的产生是其中最重要的适应性特征之一。目前在极地鱼类中发现抗冻蛋白有5种类型,包括抗冻糖蛋白(AFGP)和4种抗冻蛋白(AFPI、AFP II、AFP III和AFP IV)。虽然这些抗冻蛋白的起源和进化有所不同,但他们都具有抗冻的功能。作为一类能够抑制冰晶生长的蛋白质,南极鱼抗冻蛋白能使鱼的体液冰点降低至-2.2℃,所以其体液在海水冰点之下仍能保持流动性,避免冷冻损伤的发生。由于抗冻蛋白的热滞活性、冰重结晶抑制等天然活性,使其在食品、农业、医药等领域具有良好的应用前景。本文将对南极鱼抗冻蛋白的起源、进化、功能、应用和目前存在的问题进行概括性的综述。

    Abstract:

    Ever since the Antarctic waters began to cool about 20 million years ago, Antarctic notothenioid fishes, comprising more than 120 species, have been living in the stable, extremely cold, and oxygen-rich Antarctic waters, when all other temperate fishes gradually disappeared. In order to survive the coldest area in the world, Antarctic notothenioid fishes have evolved many adaptive changes in their biochemical and physiological functions; among these changes, the origin and evolution of antifreeze proteins is one of the most important adaptations of Antarctic fishes. Antifreeze proteins are a family of macromolecules that are essential for survival in extreme cold conditions. For the time being, at least one antifreeze glycoprotein (AFGP) and four structurally different antifreeze protein (AFPs) types, known as AFP I, AFP II, AFP III, and AFP IV, have been identified from polar and subpolar fishes. Although these AFPs have similar structures and functions, their origin and evolution are significantly different. AFPs have also been found in insects, plants, and bacteria living in cold habitats. In fish, AFPs are typically secreted into the blood and also produced in the skin, scales, fin, and gills. AFPs cause ice recrystallization inhibition and contribute to non-colligative freezing point depression by binding to small ice crystals in order to inhibit their growth. AFPs can reduce the freezing point of Antarctic notothenioid fishes' body fluids to -2.2℃; this preserves the fluidity of body fluids at sub-zero temperatures and protects fishes from freezing damage. Due to the natural biological properties of AFPs, such as the thermal hysteresis activity (THA) and the inhibition of ice recrystallization activities (IRI), they have several commercial applications. AFPs can be used in the food industry for food preservation and ice cream production; they can also be used in the agricultural and biomedical fields to freeze and preserve a wide variety of biological samples including body tissues (cells, organs, embryos, and gametes) of human beings, animals, and fishes. Additionally, AFP transgenic plants show enhanced cold tolerance. Studies have demonstrated that AFPs are up to 300 times more effective than traditional antifreeze chemicals at the same concentrations and they can improve post-thaw viability regardless of the freezing method. Since AFPs show promising potential application prospects in the fields of medicine, food industry, agriculture, etc., there has been an accumulation of relevant published research recently. In this paper, the evolution, function, application, and current concerns regarding the use of AFPs were reviewed.

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张俊芳,陶筱帆,韩兵社.南极鱼抗冻蛋白功能和进化及其应用研究进展[J].中国水产科学,2020,27(3):355-361
ZHANG Junfang, TAO Xiaofan, HAN Bingshe. Function, evolution, and application of antifreeze proteins in Antarctic fish[J]. Journal of Fishery Sciences of China,2020,27(3):355-361

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  • 在线发布日期: 2020-03-11
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