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Proteomic Landscape of the Mature Roots in a Rubber-Producing Grass Taraxacum Kok-saghyz

文献类型： 外文期刊

作者： Xie, Quanliang 1 ; Ding, Guohua 2 ; Zhu, Liping 1 ; Yu, Li 1 ; Yuan, Boxuan 1 ; Gao, Xuan 1 ; Wang, Dan 3 ; Sun, Yong 3 ; Li 1 ;

作者机构： 1.Shihezi Univ, Coll Life Sci, Minist Educ, Key Lab Xinjiang Phytomed Resource & Utilizat, Shihezi 832003, Peoples R China

2.Hainan Normal Univ, Coll Life Sci, Minist Educ, Key Lab Ecol Trop Isl, Haikou 571158, Hainan, Peoples R China

3.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China

关键词： natural rubber biosynthesis; mass spectrometry; rubber grass; rubber latex; shotgun proteomics; Taraxacum kok-saghyz; two-dimensional gel electrophoresis; visual proteome map

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2019 年 20 卷 10 期

页码：

收录情况： SCI

摘要： The rubber grass Taraxacum kok-saghyz (TKS) contains large amounts of natural rubber (cis-1,4-polyisoprene) in its enlarged roots and it is an alternative crop source of natural rubber. Natural rubber biosynthesis (NRB) and storage in the mature roots of TKS is a cascade process involving many genes, proteins and their cofactors. The TKS genome has just been annotated and many NRB-related genes have been determined. However, there is limited knowledge about the protein regulation mechanism for NRB in TKS roots. We identified 371 protein species from the mature roots of TKS by combining two-dimensional gel electrophoresis (2-DE) and mass spectrometry (MS). Meanwhile, a large-scale shotgun analysis of proteins in TKS roots at the enlargement stage was performed, and 3545 individual proteins were determined. Subsequently, all identified proteins from 2-DE gel and shotgun MS in TKS roots were subject to gene ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses and most proteins were involved in carbon metabolic process with catalytic activity in membrane-bounded organelles, followed by proteins with binding ability, transportation and phenylpropanoid biosynthesis activities. Fifty-eight NRB-related proteins, including eight small rubber particle protein (SRPP) and two rubber elongation factor(REF) members, were identified from the TKS roots, and these proteins were involved in both mevalonate acid (MVA) and methylerythritol phosphate (MEP) pathways. To our best knowledge, it is the first high-resolution draft proteome map of the mature TKS roots. Our proteomics of TKS roots revealed both MVA and MEP pathways are important for NRB, and SRPP might be more important than REF for NRB in TKS roots. These findings would not only deepen our understanding of the TKS root proteome, but also provide new evidence on the roles of these NRB-related proteins in the mature TKS roots.

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