薰衣草非特异性脂质转移蛋白的鉴定与功能分析
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新疆师范大学生命科学学院

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新疆自治区自然科学基金面上项目 (2022D01A216,2022D01A215);新疆师范大学博士科研启动基金(XJNUBS2109)


Identification and functional analysis of nonspecific lipid transfer proteins in lavender
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1.College of Life Sciences, Xinjiang Normal University;2.College of Life Sciences,Xinjiang Normal University

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Natural Science Foundation of Xinjiang Uygur Autonomous Region (2022D01A216, 2022D01A215);Doctoral Research Initiation Fund of Xinjiang Normal University (XJNUBS2109)

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    摘要:

    非特异性脂质转移蛋白(non-specific lipid transfer proteins,nsLTP )在植物脂质转运和分泌中发挥重要作用。本研究从薰衣草(Lavandula angustifolia)中克隆到2个II型nsLTP基因,命名为nsLTP2-1和nsLTP2-2。分析它们序列特征,nsLTP2-1和nsLTP2-2分别编码119个和117个氨基酸,具有脂转移蛋白(LTP)保守结构域和8个高度保守的半胱氨酸残基;系统进化分析显示它们处于两个分支,与唇形科的紫苏(Perilla frutescens)相似性最高。基因表达分析显示2个基因均在花蕾中高表达,在叶片、茎和花瓣中表达较低,在花萼中的表达存在差异,nsLTP2-1和nsLTP2-2分别在成熟花萼和幼嫩花萼中表达量更高。暗处理、赤霉素处理显著抑制2个基因花蕾和叶片中的表达;在花蕾中,脱落酸和光照处理会诱导它们的表达;在叶片中,茉莉酸甲酯和乙烯分别诱导nsLTP2-1和nsLTP2-2的表达。亚细胞定位显示2个nsLTPs 均定位在细胞膜和细胞壁上,可能与次生代谢物的转运有关。这些结果为明确薰衣草脂转移蛋白在脂类及萜类转运中的功能研究提供了参考。

    Abstract:

    Non-specific lipid transfer proteins (nsLTPs) play a crucial role in the transport and secretion of lipids in plants. In this study, two type II nsLTP genes were cloned, namely nsLTP2-1 and nsLTP2-2, from Lavandula angustifolia. The analysis of sequence characteristics revealed that the nsLTP2-1 and nsLTP2-2 genes encode 119 and 117 amino acids, respectively, which exhibit conserved lipid transfer proteins (LTP) domains and 8 highly conserved cysteine residues. The phylogenetic analysis revealed that these genes are located in separate branches and share the closest genetic relationship with Perilla frutescens, a member of the Labiatae family. The analysis of gene expression showed that both genes exhibit high expression levels in flower buds, while exhibiting comparatively reduced levels. However, notable disparities in expression were observed in the calyx, with nsLTP2-1 and nsLTP2-2 demonstrating higher expression levels in mature and young calyxes, respectively. The expression of two genes in flower buds and leaves was significantly inhibited by the treatment involving gibberellin and methyl jasmonate. Specifically,Dark treatment and gibberellin treatment significantly inhibited the expression of the two genes in bud and leaf. In the buds, abscisic acid and light treatment induced their expression, In the leaf, methyl jasmonate and ethylene induced the expression of nsLTP2-1 and nsLTP2-2, respectively. The subcellular localization of the yellow fluorescent protein (EYFP) fusion protein demonstrated that both nsLTPs were localized on the cell membrane and cell wall, indicating they may be related to the transport of secondary metabolites. These findings provide a fundamental basis for elucidating the role of lavender lipid transfer protein in lipid and terpenoid transportation.

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  • 收稿日期:2023-12-20
  • 最后修改日期:2024-01-26
  • 录用日期:2024-02-23
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