在欧和非欧 angiosperms 中,银河糖甘的结构不同.
Konan Ishida1, Yusuke Ohba2, Yoshihisa Yoshimi1
1Department of Biochemistry, University of Cambridge, Hopkins Building, The Downing Site, Tennis Court Road, Cambridge, United Kingdom.
PloS one
|December 21, 2023
概括
β-银糖甘 (β-GGM) 是一种尤迪科特特异性的细胞壁成分. 研究了其独特的结构和植物进化过程中的获取机制,揭示了植物细胞壁多样化的洞察力.
科学领域:
- 植物生物学 植物生物学
- 植物细胞壁生物化学 植物细胞壁生物化学
- 进化植物学 进化植物学
背景情况:
- 细胞壁曼南半纤维素体在植物进化过程中表现出结构多样性.
- 最近,Beta-galactoglucomannan (β-GGM) 是一种具有特定β-galactose分支的新型结构,在鱼中被发现.
- β-GGM 的进化起源和获取仍然不清楚.
研究的目的:
- 研究β-GGM及其相关酶的进化史.
- 确定植物何时以及如何获得β-GGM.
- 为了确定候选曼南β-银酸转移酶 (MBGTs) 在非欧类物种中.
主要方法:
- 在植物群中的曼南结构的比较分析.
- 生物信息学搜索非欧种子中关键的曼南修饰酶 (例如AtMBGT1) 的正方体.
- 在活体中,使用Arabidopsis的补充试验和大米的逆遗传学进行候选酶的功能性表征.
主要成果:
- 尤迪科特的姐妹群体中的葡萄甘结构与β-GGM不同.
- 来自大米的AtMBGT1 (OsGT47A-VII) 和Amborella (AtrGT47A-VII) 的正义基因缺乏直接的MBGT活动.
- 米骨科 (OsGT47A-VII) 呈现出MUR3类的糖银转移酶活性,对米的根生长至关重要.
- 尤迪科特的GT47A-VII家族内的基因重复和多样化可能促进了获得曼南β-银酸转移酶活性.
结论:
- β-银糖甘 (β-GGM) 很可能是一种尤迪科特特异性的细胞壁多糖.
- GT47A-VII基因家族的演变在获得β-GGM方面发挥了作用.
- 了解β-GGM进化为植物细胞壁多样化和适应提供了洞察力.
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