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草业学报 ›› 2011, Vol. 20 ›› Issue (3): 192-197.

• 研究论文 • 上一篇    下一篇

一种有效检测水稻叶鞘低丰度蛋白的方法

王莹1,2,崔为同1,2,杨明峰1,2,沈世华1,2*   

  1. 1.中国科学院北京植物所,北京100093;
    2.中国科学院研究生院,北京100049
  • 收稿日期:2010-04-11 出版日期:2011-03-25 发布日期:2011-06-20
  • 通讯作者: E-mail:shshen@ibcas.ac.cn
  • 作者简介:王莹(1985-),女,山东菏泽人,在读硕士。E-mail:wangying8558@hotmail.com
  • 基金资助:
    国家高技术研究发展计划项目(No. 2007AA10Z109)资助。

An approach to detect the low-abundant proteins in rice leaf sheath

WANG Ying1,2, CUI Wei-tong1,2, YANG Ming-feng1,2, SHEN Shi-hua1,2   

  1. 1.Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China;
    2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2010-04-11 Online:2011-03-25 Published:2011-06-20

摘要: 蛋白质组学研究中,低丰度蛋白的富集、检测和鉴定是主要的技术难题。植物组织中核酮糖-1,5-二磷酸羧化/加氧酶(rubisco)等高丰度蛋白占细胞全蛋白很大比例,严重影响双向凝胶电泳(2-DE)对低丰度蛋白的检测。为探索一种适用于叶鞘低丰度蛋白的有效检测方法,本研究采用聚乙二醇(PEG)沉淀法以减少rubisco等高丰度蛋白,富集低丰度蛋白。以Mg/NP-40法为对照,分别使用15%和20%PEG分离水稻叶鞘可溶性全蛋白,并将对照和各PEG分离组分进行2-DE。2-DE图谱经软件分析结果表明,20%PEG沉淀法适用于灌浆期叶鞘低丰度蛋白检测。

Abstract: Enrichment of low-abundant proteins and their detection still remain great challenges in proteomics research. The existence of high-abundant proteins, e.g. ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) in plants, leads to this dilemma. The high-abundant proteins engage a large proportion of the whole-cell proteins and thus make the low-abundant proteins poorly detectable by 2-DE. In this report, we used a protocol for the preparation of whole-cell proteins through polyethylene glycol (PEG) precipitation, to develop an approach of identifying low-abundant proteins in rice leaf sheathes. In a comparison of the 2-DE analyses of protein samples prepared using the Mg/NP-40 method without PEG fractionation, with the 15% and 20% PEG fractionation protocol, a relatively high reproducibility was achieved using the 20% PEG fractionation protocol in terms of protein species and low-abundant proteins.

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