生物技术通报 ›› 2014, Vol. 0 ›› Issue (8): 94-101.

• 研究报告 • 上一篇    下一篇

兰州大尾羊MAPK13基因cDNA克隆及生物信息学分析

金方园1, 徐红伟2, 达小强1, 臧荣鑫1, 柏家林1, 曹忻2, 蔡勇2, 冯玉兰1, 杨具田2   

  1. 1.西北民族大学生命科学与工程学院, 兰州 730030;
    2.西北民族大学实验中心, 兰州 730030
  • 修回日期:2014-01-23 出版日期:2014-08-15 发布日期:2014-08-01
  • 作者简介:作者简介: 金方园,E-mail:373995197@qq.com

Cloning and Bioinformatics Analysis of MAPK13 Gene in Lanzhou Fat-tailed Sheep

Jin Fangyuan1, Xu Hongwei2, Da Xiaoqiang1, Zang Rongxin1, Bai Jialin1, Gao Xin2, Cai Yong2, Feng Yulan1, Yang Jutian2   

  1. 1. College of Life Science and Engineering, Northwest University for Nationalities, Lanzhou 730030;
    2. Science Experimental Center, Northwest University for Nationalities, Lanzhou 730030
  • Revised:2014-01-23 Published:2014-08-15 Online:2014-08-01
  • Supported by:

    国家自然科学基金项目(31160440,31260533,31360529);甘肃省科技支撑计划项目(1011NKCA051);兰州市科技计划项目(2011-1-113);西北民族大学研究生科研创新项目(ycx13175)

摘要:

克隆兰州大尾羊促分裂素原活化蛋白激酶MAPK13基因,并分析其序列及其编码蛋白的生物学特性,为研究绵羊MAPK13基因的功能和生产应用提供参考。根据绵羊MAPK13基因CDS序列设计特异引物,利用RACE和RT-PCR技术克隆获得兰州大尾羊MAPK13基因全长序列,并结合生物信息学方法分析其生物学特性。克隆获得兰州大尾羊MAPK13基因cDNA 序列全长1 397 bp,其CDS区片段长1 102 bp,编码367个氨基酸。预测兰州大尾羊MAPK13蛋白分子量为42.29 kD,理论等电点为8.82,为非跨膜的疏水性蛋白,亚细胞定位主要在细胞质中,无信号肽,不属于分泌蛋白。预测其氨基酸序列有19个磷酸化位点,3个糖基化位点,3个磷酸化功能结构域,4个其他结构域,1个LCR片段,二级结构以α-螺旋为主。同源性分析显示兰州大尾羊MAPK13基因序列与已发布的绵羊MAPK13 mRNA序列(登录号:NM_001139455.1)相比,其第852位发生碱基转换(CA),导致编码蛋白第265位氨基酸发生碱基转换(ST),同时,第951位发生碱基转换(TG),但其所编码氨基酸不变。构建的基因进化树分析结果显示兰州大尾羊与牛亲缘关系最近。兰州大尾羊与其他物种MAPK13基因在结构上相似性较高,说明该基因具有高度的保守性,其序列包含的S_TKc结构域可将ATP的γ磷酰基转移到蛋白质丝氨酸/苏氨酸残基上,导致一系列肥胖相关基因的功能失调和表达变化,为进一步研究MAPK13基因与成脂分化过程的相关性提供了参考。

关键词: 兰州大尾羊, MAPK13基因, cDNA, 末端快速扩增, 生物信息学

Abstract:

The objective of this study is to reveal the biological function of mitogen-activated protein kinases(MAPK)gene in sheep and provide theoretical data for application by cloning MAPK and analyzing its sequence as well as genetic features. The specific primers on the CDS template of MAPK13 gene were designed and then the MAPK13 gene sequence of Lanzhou fat-tail sheep was cloned using RACE and RT-PCR technology. After that, its genetic characteristics were analyzed by bioinformatics methods. The 1 397 bp full-length cDNA of MAPK13 of Lanzhou fat-tailed sheep was obtained, in which the length of CDS is 1 102 bp. It encodes 367 amino acids in total. It was predicted that the molecular weight of MAPK13 protein of Lanzhou fat-tail sheep is 42.29 kD and its theoretical isoelectric point is 8.82. It is a non-transmembrane hydrophobin with no signal peptide, which locates mostly in cytoplasm by the result of subcellular level prediction and does not belong to the secretory protein. Its amino acid sequence contains 19 phosphorylation sites, 3 glycosylation sites, 3 phosphorylation domains, 4 other domains and 1 LCR domain. Also, its secondary structure is mainly randomly curly. Nucleotide sequence analysis revealed that the gene nucleotide sequence of Lanzhou fat-tail sheep has some different from the known sheep MAPK13 mRNA(Genbank No.:NM_001139455.1). Base transition occur in the 852th site is(C vs. A), respectively, the corresponding amino acids in the 265th is(S vs. T). Base transition occur in the 951th site is(T vs. G), but the corresponding amino acids do not change.The phylogenetic tree indicates that Lanzhou fat-tail sheep is close to bos. The fact that the structure of MAPK13 of Lanzhou fat-tail sheep highly similar with other species indicates that the gene is highly conservative. The S_TKc domain in the sequence can transfer the gamma phosphoryl of ATP to the serine / threonine residues of protein, leading to function imbalance and expression change in a series of obesity related gene.

Key words: Lanzhou fat-tailed sheep, MAPK13 gene, RACE, Bioinformatics analysis