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HUANG Huiming, LI Shanshan, LI Haiming, et al. Screening and Identification of Differential Proteins in Cymbopogon citratus Stems and Leaves by K-Means Clustering Analysis [J]. Chinese Journal of Applied Chemistry, 37(4): 455-463
Screening and Identification of Differential Proteins in Cymbopogon citratus Stems and Leaves by K-Means Clustering Analysis
HUANG Huiming, LI Shanshan, LI Haiming, WU Shuijin, LI Yueshen, LIN Hongtao, ZHENG Kaibin
Subtropical Agricultural Research Institute,Fujian Academy of Agricultural Sciences,Zhangzhou,Fujian 363000,China
Corresponding author:ZHENG Kaibin, professor; Tel:0596-2122116; E-mail:409119296@qq.com; Research interests:natural products of agricultural productions, extraction process of active ingredients
Fund:Supported by the Youth Talents Innovation Fund of Fujian Academy of Agricultural Sciences(No.YC2017-2), and Science and Technology Innovation Team Building Project of Fujian Academy of Agricultural Sciences(No.STIT2017-2-11)
Abstract
The lemongrass plant contains a huge amount of essential oil which had a wide application. It was found that there were great differences between the stem and leaves of lemongrass in essential oil yields. In this paper, we investigated the differential expression protein spots in two-dimensional electrophoresis (2-DE) of lemongrass stem and leaves via K-means clustering. Three parts of lemongrass, flag-leaf, mature-leaf and stem, which were significant different in essential oil contents, were taken to detect the total protein content and analysize the protein expression profiles by 2-DE. K-means clustering of different protein spots was carried out on abundance, isoelectric point (pI) and molecular mass. It was found that the total protein content of flag-leaf and mature-leaf was higher than that of stem, and the total protein content of flag leaf and mature-leaf had little difference. Cluster analysis of the abundance, isoelectric point (pI) and molecular mass of different protein spots in three parts of lemongrass showed that the up-regulated protein spots in flag-leaf and stem were sensitive to molecular weight changes, and the up-regulated protein spots in mature-leaf were more sensitive to abundance changes. Based on this, 15 protein pots were selected and 9 proteins were successfully identified by matrix-assisted laser desorption/ionization (MALDI-TOF/TOF-MS). Our study provides new basic information and research perspective of protein pathway of Cymbopogon citratus essential oil metabolism.
Keyword:
lemongrass; two-dimensional electrophoresis; K-means clustering analysis; mass spectrometric identification
蛋白质作为生命体的重要组成之一,是大部分生理活动的执行者,其内在性质、丰度差异及分布规律等特性与植物的基因表达及次生代谢活动等密切相关[5]。 双向凝胶电泳技术(2-Dimensional gel Electrophoresis,2-DE)是传统的蛋白质差异表达分析技术,在蛋白质组学研究中应用非常广泛[6]。 通过将研究对象不同生长状态、不同发育阶段的蛋白质进行动态差异分析,可获得生物体蛋白质调节及相互作用的重要信息,了解相关代谢活动的生理机制[7,8]。
图2 不同部位蛋白质双向电泳图谱(部分上调表达蛋白斑点序号已在图中标注)Fig.2 2-DE maps of proteins in different plant parts of Cymbopogon citrates A, B and C represent flag-leaf, mature-leaf and stem, respectively. Some order numbers of up-regulated protein spots have been marked in the figure
图3 不同差异蛋白斑点的聚类分析图Fig.3 Cluster analysis diagrams of differential protein spots of different plant parts ●dots, ■ dots and ▲ dots represent cluster 1, cluster 2 and cluster 3, respectively Diagram A, B, B, D, E and F, represent the up-regulated protein spots of each contrast groups: flag leaf in [Ⅰ:Ⅱ ]; mature leaf in [Ⅰ:Ⅱ]; flag leaf in [Ⅰ:Ⅲ]; stem in [Ⅰ:Ⅲ]; mature leaf in [Ⅱ:Ⅲ]; stem in [Ⅱ:Ⅲ] respectively
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