Synthesis of borate cross-linked rhamnogalacturonan II.
Synthesis of borate cross-linked rhamnogalacturonan II.
复制标题
硼酸盐交联鼠李半乳糖醛酸II的合成。
DOI：
10.3389/fpls.2015.00223
复制
发表时间：
2015
影响因子：
5.6
通讯作者：
Miwa K
中科院分区：
文献类型：
--
作者：
Funakawa H;Miwa K
在本综述中，我们描述了有关硼酸盐交联鼠李半乳糖醛酸 II (RG-II) 合成及其生理作用的最新知识。 RG-II 是果胶多糖的一部分，具有高度复杂性，存在于初生细胞壁中。它由同型半乳糖醛酸主链和四个不同的侧链 (A–D) 组成。硼酸酯与两个 RG-II 单体的侧链 A 的芹基残基形成酯键，生成硼酸酯二聚化的 RG-II，有助于果胶多糖网络的形成。在植物细胞壁中，在硼(B)充足的条件下，90%以上的RG-II被硼酸盐二聚化。据我们所知，原代细胞壁中 RG-II 的硼酸盐交联是 B（一种必需的微量元素）唯一经过实验证明的分子功能。尽管细胞壁多糖中 RG-II 和 B 的丰度相当小，但越来越多的证据支持 RG-II 及其硼酸盐交联对于植物生长和发育至关重要。最近在RG-II合成和硼酸盐交联的位置和机制方面取得了重大进展。分子遗传学研究已成功确定了 RG-II 合成的关键酶和调节剂，包括有效形成 RG-II 交联和随后正常植物生长所需的 B 转运蛋白。本文重点介绍以下方面的最新进展：(i) RG-II 多糖合成、(ii) 硼酸盐交联的发生和 (iii) 将硼酸盐供应至 RG-II 的 B 运输。讨论了硼酸盐 RG-II 交联形成的分子机制及其生理影响。
In the present review, we describe current knowledge about synthesis of borate crosslinked rhamnogalacturonan II (RG-II) and it physiological roles. RG-II is a portion of pectic polysaccharide with high complexity, present in primary cell wall. It is composed of homogalacturonan backbone and four distinct side chains (A–D). Borate forms ester bonds with the apiosyl residues of side chain A of two RG-II monomers to generate borate dimerized RG-II, contributing for the formation of networks of pectic polysaccharides. In plant cell walls, more than 90% of RG-II are dimerized by borate under boron (B) sufficient conditions. Borate crosslinking of RG-II in primary cell walls, to our knowledge, is the only experimentally proven molecular function of B, an essential trace-element. Although abundance of RG-II and B is quite small in cell wall polysaccharides, increasing evidence supports that RG-II and its borate crosslinking are critical for plant growth and development. Significant advancement was made recently on the location and the mechanisms of RG-II synthesis and borate cross-linking. Molecular genetic studies have successfully identified key enzymes for RG-II synthesis and regulators including B transporters required for efficient formation of RG-II crosslinking and consequent normal plant growth. The present article focuses recent advances on (i) RG-II polysaccharide synthesis, (ii) occurrence of borate crosslinking and (iii) B transport for borate supply to RG-II. Molecular mechanisms underlying formation of borate RG-II crosslinking and the physiological impacts are discussed.
登录
查看更多内容
DOI：
10.1111/tpj.12403
发表时间：
2014-02
期刊：
The Plant journal : for cell and molecular biology
影响因子：
--
作者：
Chormova D;Messenger DJ;Fry SC
通讯作者：
Fry SC
影响因子：
7.4
作者：
Kong, Yingzhen;Zhou, Gongke;Hahn, Michael G.
通讯作者：
Hahn, Michael G.
影响因子：
27.5
作者：
Caffall, Kerry H.;Pattathil, Sivakumar;Mohnen, Debra
通讯作者：
Mohnen, Debra
影响因子：
7.2
作者：
Gilbert, Louise;Alhagdow, Moftah;Baldet, Pierre
通讯作者：
Baldet, Pierre
影响因子：
11.6
作者：
Chatterjee, Mithu;Tabi, Zara;Gallavotti, Andrea
通讯作者：
Gallavotti, Andrea