中国沙漠 ›› 2018, Vol. 38 ›› Issue (3): 578-583.DOI: 10.7522/j.issn.1000-694X.2018.00019

• 生物与土壤 • 上一篇    下一篇

斧翅沙芥(Pugionium dolabratum)脂质转运蛋白基因PdLTP3的克隆及其对干旱胁迫的响应

王玮1, 杨宁1, 张莉环1, 冯起2   

  1. 1. 西北师范大学 生命科学学院, 甘肃 兰州 730070;
    2. 中国科学院西北生态环境资源研究院 内陆河流域生态水文重点实验室, 甘肃 兰州 730000
  • 收稿日期:2018-01-28 修回日期:2018-03-15 出版日期:2018-05-20 发布日期:2018-11-06
  • 通讯作者: 冯起(
  • 作者简介:王玮(1983-),女,甘肃兰州人,博士,讲师,主要从事植物激素信号转导研究。
  • 基金资助:

Cloning and Expression Analysis of LIPID TRANSFER PROTEIN 3 Gene under Drought Stress in Pugionium dolabratum

Wang Wei1, Yang Ning1, Zhang Lihuan1, Feng Qi2   

  1. 1. College of Life Science, Northwest Normal University, Lanzhou 730070, China;
    2. Key Laboratory of Ecohydrology in Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2018-01-28 Revised:2018-03-15 Online:2018-05-20 Published:2018-11-06

摘要: 以濒危荒漠植物斧翅沙芥(Pugionium dolabratum)为对象,克隆脂质转运蛋白基因PdLTP3。运用Protparam、Multiple Sequence Alignment、MEGA、SignalP 4.1 Server、TMHMM Server v.2.0、SOPMA、SWISS-MODEL等软件对其编码的氨基酸序列进行生物信息学分析,并检测干旱胁迫下PdLTP3基因的诱导表达情况。结果表明:从斧翅沙芥cDNA中克隆到PdLTP3基因全长,开放阅读框编码116个氨基酸,预测分子量为11.7 kD,理论等电点8.91,平均亲水性系数0.569,是一个疏水蛋白质;同源比对显示其编码的蛋白质与拟南芥AtLTP3相似度较高;PdLTP3蛋白N端1~23个氨基酸序列为信号肽序列;二级和三级结构显示PdLTP3蛋白主要由α螺旋和无规则卷曲组成;干旱胁迫下PdLTP3基因表达量逐渐升高,5 h后表达量约为胁迫处理前的48.6倍,说明其可能参与了斧翅沙芥干旱胁迫耐受。

关键词: 脂质转运蛋白, 斧翅沙芥(Pugionium dolabratum), 生物信息学分析, 干旱胁迫, 基因表达

Abstract: Pugionium dolabratum LIPID TRANSFER PROTEIN 3 (PdLTP3) was cloned from endangered desert plant P. dolabratum. Protparam, Multiple Sequence Alignment, MEGA, SignalP 4.1 Server, TMHMM Server v.2.0, SOPMA, and SWISS-MODEL softwares were performed to analyze the predicted amino acid sequence of PdLTP3 gene. The relative gene expression pattern of PdLTP3 under drought stress was investigated by qPCR. The results suggested that the full length of PdLTP3 gene was cloned from P. dolabratum cDNA, encoding a 116 amino acids protein with a calculated molecular weight of 11.7 kD and a theoretical isoelectric point of 8.91. The grand average of hydropathicity of PdLTP3 was 0.569, representing a hydrophobic protein. The homologous alignment showed the PdLTP3 protein was high similarity with Arabidopsis thaliana LTP3 protein. The sequence of 1-23 amino acids in N terminal of PdLTP3 was signal peptide. The secondary and tertiary structure prediction showed that the PdLTP3 protein was mainly composed of alpha helix and random coil. Under drought stress, the gene expression of PdLTP3 was increased gradually and the expression level after 5 hours treatment increased to 48.6 times compared that before treatment, suggesting PdLTP3 probably involves in drought tolerance. These results provide a basis for further study of the function of PdLTP3 and the drought tolerance mechanism of P. dolabratum.

Key words: lipid transfer protein, Pugionium dolabratum, bioinformatics analysis, drought stress, gene expression