Molecular characterization and dietary regulation of aminopeptidase N (APN) in the grass carp (Ctenopharyngodon idella)

文献类型： 外文期刊

第一作者： Tang, Jianzhou

作者： Tang, Jianzhou;Tang, Xiangbei;Hou, Dexing;Tang, Jianzhou;Qu, Fufa;Zhao, Qiong;Wang, Yonghong;Zhou, Yi;Feng, Junchang;Lu, Shuangqing;Liu, Zhen;Liu, Zhen

作者机构：

关键词： Ctenopharyngodon idellus;Aminopeptidase N;Molecular characteristics;mRNA expression profile

期刊名称：GENE （ 影响因子：3.688； 五年影响因子：3.329 ）

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收录情况： SCI

摘要： Aminopeptidase N (APN) is a member of the peptidase M1 family and plays an important role in protein digestion. In the present study, an APN gene was cloned from the intestine of Ctenopharyngodon idellus. The full-length cDNA sequence of APN encodes an 892-amino-acid peptide that includes one helix trans membrane region. Phylogenetic analysis showed that the APN sequence clustered with Danio redo as its closest neighbor, sharing a sequence similarity of 81.5%. APN mRNA was differentially expressed in different tissues, with a gradient expression from high to low in the tissues of the fore-intestine, hind -intestine, liver, mid -intestine, kidney, muscle, spleen and heart APN expression in grass carp had a circadian pattern, showing time-dependent higher expression between 06:00 and 18:00 and lower expression between 18:00 and 06:00. In addition, the protein levels and resource in the diet-regulated APN expression suggested that low crude protein (CP) level and fish meal stimulated APN gene expression. Furthermore, the mRNA expression of APN in the intestine was significantly suppressed by high concentrations of glutamine and glutamine dipeptides, respectively. This study may provide valuable knowledge on the regulation of APN expression in teleost, which has potential applications for improving fish dietary formulations. (C) 2016 Elsevier B.V. All rights reserved.

分类号： R394

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