金线莲甘露糖-1-磷酸尿苷转移酶基因的克隆与表达分析

李和平; 林江波; 黄惠明; 邹晖; 戴艺民

doi:10.19303/j.issn.1008-0384.2023.05.004

金线莲甘露糖-1-磷酸尿苷转移酶基因的克隆与表达分析

doi: 10.19303/j.issn.1008-0384.2023.05.004

福建省农业科学院亚热带农业研究所，福建漳州 363005

基金项目: 福建省科技计划公益类专项（2020R1030003）；福建省农业科学院科技创新团队建设项目（ CXTD2021001-2）

详细信息

作者简介:
李和平（1982-），男，硕士，助理研究员，研究方向：经济作物育种与分子生物学（E-mail：hepingli_1982@126.com）

通讯作者:
戴艺民（1969-），男，博士，研究员，研究方向：药用植物创新利用（E-mail：dymttcn@163.com）

中图分类号: Q786
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出版历程
- 收稿日期: 2022-12-22
- 修回日期: 2023-04-06
- 网络出版日期: 2023-05-24
- 刊出日期: 2023-05-28

Cloning and Expression of Mannose-1-phosphate Guanyltransferase Gene in Anoectochilus roxburghii

Institute of Subtropical Agriculture, Fujian Academy of Agricultural Sciences, Zhangzhou, Fujian　363005, China

摘要

摘要: 目的甘露糖是金线莲多糖重要组成成分，对甘露糖-1-磷酸尿苷转移酶（GMP）基因进行克隆和基因表达调控分析，为进一步研究金线莲多糖的生物合成奠定基础。方法以梅花山金线莲植株为材料，克隆ArGMP基因的cDNA序列和基因组序列，利用在线软件进行生物信息学分析，并对其基因表达调控模式进行qRT-PCR分析。结果金线莲ArGMP基因ORF区序列长1086 bp，共编码361个氨基酸；基因组序列长度为1760 bp，含有3个内含子，GenBank登录号OQ030271。生物信息学分析表明：ArGMP蛋白是一种较稳定的、无跨膜结构的亲水蛋白，该蛋白与铁皮石斛、深圳拟兰、蝴蝶兰等兰科植物的亲缘关系较近。qRT-PCR结果显示：ArGMP基因在金线莲不同组织中的表达量差异显著，在花中的表达量最高；在不同种植温度处理条件下，25 ℃时表达量最高，高温严重抑制其表达；35 ℃高温处理不同时间显示，处理3 h后ArGMP基因表达量显著下降；而不同浓度NaCl胁迫处理对ArGMP基因表达基本无影响。结论克隆了甘露糖-1-磷酸尿苷转移酶基因的cDNA序列和基因组序列，发现该基因具有组织特异性表达的特点，且该基因受温度调控，而不受盐胁迫调控，这为进一步研究金线莲多糖生物合成调控机制奠定理论基础。
- 金线莲 /
- 甘露糖-1-磷酸尿苷转移酶 /
- 多糖 /
- 基因表达
Abstract: Objective Cloning and expression of mannose-1-phosphate guanyltransferase (GMP) gene that regulates the polysaccharide synthesis in Anoectochilus roxburghii were studied. Method ArGMP cDNA and genome sequences were cloned, and bioinformatics analyzed using online software. Gene expression pattern was then determined by qRT-PCR. Result The ORF of ArGMP was 1 086 bp encoded 361 amino acids with a length of 1 760 bp that contained 3 introns. It has an accession number of OQ030271 in GenBank. A stable hydrophilic protein free of a transmembrane structure, it was closely related to those of Dendrobium officinale, Apostasia shenzhenica, and Phalaenopsis equestris. Expressed differently in different tissues, the highest level was found in the flowers. The expression varied under different temperatures that peaked at 25 ℃, decreased significantly after 3 h at 35 ℃, and was severely inhibited beyond that. However, it was not affected by the stress exerted by NaCl in different concentrations. Conclusion The cDNA and sequence of GMP gene from A. roburghii were successfully cloned to display a tissue-specific expression pattern that could be significantly affected by temperature but not salt stress.
- Anoectochilus roxburghii /
- mannose-1-phosphate guanyltransferase /
- polysaccharide /
- gene expression

HTML全文

图 1 ArGMP基因cDNA序列（A）和基因组序列扩增（B）

M1：DL2000 DNA Marker；1：cDNA扩增产物；M2：DL2000 plus DNA Marker；2：基因组扩增产物。

Figure 1. Amplification results of ArGMP cDNA（A） and genome sequence（B）

M1: DL2000 DNA marker; 1: cDNA amplification product; M2: DL2000 plus DNA marker; 2: amplified genome products.

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图 2 ArGMP基因序列结构和蛋白序列预测

Figure 2. Predicted ArGMP structure and sequence

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图 3 ArGMP蛋白的亲水性、二级和三级结构预测

A：ArGMP蛋白亲水性预测；B：ArGMP蛋白二级结构；C：ArGMP蛋白三级结构。

Figure 3. Predicted hydrophilicity and secondary and tertiary structures of ArGMP protein

A: Predicted hydrophilicity of ArGMP protein; B: secondary structure of ArGMP protein; C: tertiary structure of ArGMP protein.

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图 4 基于GMP蛋白氨基酸序列同源性构建的系统发育进化树

Figure 4. Phylogenetic tree based on amino acid sequence of GMP protein from different species

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图 5 ArGMP基因在不同处理的表达情况

A：不同组织样品；B：不同种植温度处理；C：高温处理不同时间；D：盐胁迫处理。不同大、小写字母表示处理间差异极显著（P＜0.01）或显著（P＜0.05）。

Figure 5. Expressions of ArGMP under different treatments

A: Different tissues; B: different temperatures; C: high temperature treatment; D: salt stress. Data with different capital letters indicate extremely significant differences atP＜0.01; those with different lowercase letters, significant differences at P＜0.05.

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表 1 基因克隆和RT-qPCR引物序列

Table 1. Sequences of cloned gene and RT-qPCR primer

引物名称 Primer	正向引物(5′-3′) Forward primer(5′-3′)	反向引物(5′-3′) Reverse primer(5′-3′)	作用 Function
gGMP	ACCATGAAAGCCCTAATTCTTG	TCACATAACAATCTCAGGCT	基因克隆 Gene clone
GMP-RT	CCTTCTAAGCTGGCTTTCGG	CAACTCTTGCCCACTGTCCC	qRT-PCR
Actin	AGATGAGGCACAGTCCAAGA	GCTGGAACATTGAAGGTCTC	内参基因 Reference gene

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表 2 ArGMP蛋白的基元和结构域分析

Table 2. Motifs and domains of ArGMP

结构域 Motifs or Domains	结构域功能中文描述 Function of domain	结构域在ArGMP中的位置 Domain position in ArGMP
ASN_GLYCOSYLATION	N-糖基化	aa323~326
CAMP_PHOSPHO_SITE	依赖cAMP和cGMP蛋白激酶磷酸化	aa238~242
CK2_PHOSPHO_SITE	酪蛋白激酶II磷酸化	aa137~140，aa182~185，aa192~195，aa262~265
MYRISTYL	Ｎ-蛋白质豆蔻酰化	aa8~13，aa72~77，aa129~134，aa169~174，aa278~283，aa284~289
PKC_PHOSPHO_SITE	蛋白激酶Ｃ磷酸化	aa154~156，aa236~238
TYR_PHOSPHO_SITE	酪氨酸激酶磷酸化	aa138~145，aa201~209

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