通过REDOR NMR光谱学进行植物细胞壁交叉链接
Lynette Cegelski1, Robert D O'Connor, Dirk Stueber
1Department of Chemistry, Washington University, St. Louis, Missouri 63130, United States. cegelski@stanford.edu
Journal of the American Chemical Society
|October 23, 2010
概括
研究人员使用选择性生物合成标记和固态NMR在植物细胞壁中确定了关键蛋白质交叉链接. 这种方法揭示了大豆细胞壁中25%的氨酸在蛋白质链之间形成异氨酸交叉链.
科学领域:
- 植物生物学 植物生物学
- 生物化学 生物化学
- 生物物理学的生物物理.
背景情况:
- 植物细胞壁是复杂的结构,对植物的完整性至关重要.
- 蛋白质交叉连接在细胞壁结构和功能中起着至关重要的作用.
- 在现场确定这些交叉链接是具有挑战性的.
研究的目的:
- 开发和应用一种新的方法,用于在植物细胞壁中识别in situ蛋白质交叉链接.
- 量化氨酸参与蛋白质交叉链接的程度.
- 为了研究氨酸在蛋白质交叉链接中的作用.
主要方法:
- 选择性生物合成标记大豆细胞以同位素标记的氨酸 (l-[环-d(4)]氨酸和l-[环-4-(13) C]氨酸).
- 固态核磁共振 (NMR) 谱学,包括碳-13碳-13 (13C CPMAS) 和碳-13-2H (13C{(2) H) 旋转回声双共振 (REDOR).
- -15-15 (15N{(13) C}) REDOR使用同位素标记的氨酸 (l-[ε-(15) N,6-(13) C]氨酸).
主要成果:
- 证明大豆细胞壁中的25%的氨酸参与了蛋白质链之间的同位氨酸交叉链.
- 显示,氨酸侧链在细胞壁中的蛋白质或糖的共价交叉链中没有显著的参与.
结论:
- 选择性标记和固态NMR的综合方法对于蛋白质交叉链接的现场分析是有效的.
- 涉及氨酸的异极氨酸交叉链是大豆蛋白细胞壁的重要结构组成部分.
- 氨酸似乎在这些特定蛋白质交叉链接事件中没有起到主要作用.
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