生物技术通报 ›› 2019, Vol. 35 ›› Issue (2): 129-136.doi: 10.13560/j.cnki.biotech.bull.1985.2018-0712

• 研究报告 • 上一篇    下一篇

牦牛MDHI基因的克隆及组织表达分析

陈露露1,2, 王会1,2, 柴志欣1,2, 钟金城1,2, 王吉坤1,2, 陈智华2, 姬秋梅3, 信金伟3   

  1. 1. 西南民族大学 青藏高原动物遗传资源保护与利用教育部重点实验室,成都 610041;
    2. 西南民族大学 青藏高原研究院,成都 610041;
    3. 西藏自治区农牧科学院省部共建青稞和牦牛种质资源与遗传改良国家重点实验室,拉萨 850009
  • 收稿日期:2018-08-09 出版日期:2019-02-26 发布日期:2019-03-07
  • 作者简介:陈露露,女,硕士研究生,研究方向:分子生态学;E-mail:1556370692@qq.com
  • 基金资助:
    西南民族大学硕士研究生创新课题重点项目(CX2018SZ102),国家肉牛牦牛产业技术体系项目(CARS-37)

Cloning and Tissue Expression Analysis of MDHI Gene in Yak

CHEN Lu-lu1,2, WANG Hui1,2, CHAI Zhi-xin1,2, ZHONG Jin-cheng1,2, WANG Ji-kun1,2, CHEN Zhi-hua2, JI Qiu-mei3, XIN Jin-wei3   

  1. 1. Key Laboratory of Ministry of Education for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation,Southwest Minzu University,Chengdu 610041;
    2. Institute of Tibetan Plateau Research,Southwest Minzu University,Chengdu 610041;
    3. State Key Laboratory of Barley and Yak Germplasm Resources and Genetic Improvement,Tibet Academy of Agricultural and Animal Husbandry Sciences,Lhasa 850009
  • Received:2018-08-09 Published:2019-02-26 Online:2019-03-07

摘要: 苹果酸脱氢酶具有氧化还原活性,主要控制动物机体的能量代谢。旨在克隆牦牛MDHI基因,结合生物信息学和组织表达分析,为研究牦牛MDHI基因的理化性质及功能奠定基础。结果显示,该基因的cDNA序列长1 169 bp,CDS区全长1 005 bp,编码334个氨基酸,编码的蛋白为亲水性稳定蛋白;属于保守结构域家族;有两个跨膜区,分别是6-22位和34-54位;存在26个磷酸化位点,其中有11个Ser磷酸化位点、11个Thr磷酸化位点、4个Tyr磷酸化位点;二级结构主要由α-螺旋(152个,占45.51%),无规卷曲(110个,占32.93%)组成;三级结构与猪细胞质苹果酸脱氢酶、α-酮丙二酸和四氢NAD的三元复合物的晶体结构具有98.50%的相似性;亚细胞定位分析得到在内质网中分布最多,在高尔基体和细胞核中分布最少;同源性及系统进化树分析表明牦牛该基因与普通牛的同源性最高,推测牦牛MDHI基因在进化水平上较为保守;组织表达分析表明该基因在臀脂中表达量最高,在臀肌中表达量较低,说明该基因参与机体脂肪沉积的调控。成功克隆了MDHI基因CDS区、并进行了生物信息学及组织表达分析。

关键词: 牦牛, MDHI基因, 克隆, 生物信息学分析, 组织表达

Abstract: Malate dehydrogenase has redox activity and plays a key role in energy metabolism of animal organisms. This study aims to clone the yak MDHI gene,combined with bioinformatics analysis and tissue expression analysis,which may lay a foundation for studying the physical and chemical properties and functions of the yak MDHI gene. The results showed that the cDNA sequence of this gene was 1 169 bp,the CDS region was 1 005 bp in length and it encoded 334 amino acids. The encoded protein was a hydrophilic and stable,which belonged to the conserved domain family. There were two transmembrane areas(located in 6-22 and 34-54 amino acids respectively)and 26 phosphorylation sites(11 Ser phosphorylation sites,11 Thr phosphorylation sites and 4 Tyr phosphorylation sites). The secondary structure was mainly composed of α-helix(152,accounting for 45.51%),random coil(110,accounting for 32.93%). The tertiary structure had a similarity of 98.50% with crystal structure of the ternary complex of cytoplasmic malate dehydrogenase,α-Ketomalonic acid and tetrahydro NAD in porcine. Subcellular localization analysis revealed that most of them were distributed in the endoplasmic reticulum,least in the Golgi and nucleus. Furthermore,homology and phylogenetic tree analysis indicated that its homology was the highest with common cattle,which can be speculate that the yak MDHI gene maybe highly conserved at the evolution level. Tissue expression analysis showed that the gene was expressed the highest in gluteal fat but lower in gluteal muscle,indicating that the gene may function in fat deposition. In sum,we cloned MDHI gene successfully and performed bioinformatics and tissue expression analysis.

Key words: yak, MDHI gene, cloning, bioinformatics analysis, tissue expression