Using a cellulose-complementary oligosaccharide as a tool to probe exposed cellulosic surfaces in cotton fibres and growing plant cell walls.

IF 4.4 3区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Mahnoor Imran, Lenka Franková, Uzma Qaisar, Stephen C Fry
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引用次数: 0

Abstract

Cellulosic microfibrils in plant cell walls are largely ensheathed and probably tethered by hydrogen-bonded hemicelluloses. Ensheathing may vary developmentally as hemicelluloses are peeled to enable cell expansion. We characterised a simple method to quantify ensheathed versus naked cellulosic surfaces based on the ability to adsorb a radiolabelled 'cellulose-complementary oligosaccharide', [3H]cellopentaitol. Filter-paper (cellulose) adsorbed 40% and >80% of aqueous 5 nM [3H]cellopentaitol within ∼1 and ∼20 h respectively. When [3H]cellopentaitol was rapidly dried onto filter-paper, ∼50% of it was desorbable by water, whereas after ∼1 day annealing in aqueous medium the adsorption became too strong to be reversible in water. 'Strongly' adsorbed [3H]cellopentaitol was, however, ∼98% desorbed by 6 M NaOH, ∼50% by 0.2 M cellobiose, and ∼30% by 8 M urea, indicating a role for hydrogen-bonding reinforced by complementarity of shape. Gradual adsorption was promoted by kosmotropes (1.4 M Na2SO4 or 30% methanol), and inhibited by chaotropes (8 M urea), supporting a role for hydrogen-bonding. [3H]Cellopentaitol adsorption was strongly competed by non-radioactive cello-oligosaccharides (Cell2-6), the IC50 (half-inhibitory concentration) being highly size-dependent: Cell2, ∼70 mM; Cell3, ∼7 mM; and Cell4-6, ∼0.05 mM. Malto-oligosaccharides (400 mM) had no effect, confirming the role of complementarity. The quantity of adsorbed [3H]cellopentaitol was proportional to mass of cellulose. Of seven cottons tested, wild-type Gossypium arboreum fibres were least capable of adsorbing [3H]cellopentaitol, indicating ensheathment of their microfibrillar surfaces, confirmed by their resistance to cellulase digestion, and potentially attributable to a high glucuronoarabinoxylan content. In conclusion, [3H]cellopentaitol adsorption is a simple, sensitive and quantitative way of titrating 'naked' cellulose surfaces.

以纤维素互补寡糖为工具,探测棉纤维和生长植物细胞壁中暴露的纤维素表面。
植物细胞壁中的纤维素微纤维在很大程度上是包被的,很可能是由氢键半纤维素拴住的。随着半纤维素的剥离使细胞得以扩张,包被可能会随着发育而变化。我们研究了一种简单的方法,根据其吸附放射性标记的 "纤维素互补寡糖"--[3H]cellopentaitol--的能力来量化纤维素表面的鞘化与裸露。滤纸(纤维素)分别在 ~1h 和 ~20h 内吸附了 40% 和 >80% 的 5nM [3H]cellopentaitol 水溶液。当 [3H]cellopentaitol 被快速干燥到滤纸上时,约 50% 的[3H]cellopentaitol 可被水解吸,而在水介质中退火约 1d 后,吸附力变得太强,无法在水中逆转。然而,"强 "吸附的 [3H]cellopentaitol 在 6M NaOH 溶液中可解吸约 98%,在 0.2M 纤维素糖溶液中可解吸约 50%,在 8M 尿素溶液中可解吸约 30%,这表明氢键的作用因形状互补而得到加强。高分子吸附剂(1.4M Na2SO4 或 30% 甲醇)促进了渐进吸附,而混沌吸附剂(8M 尿素)则抑制了吸附,这证明了氢键的作用。非放射性胞寡糖(Cell2-6)对[3H]胞戊醇的吸附有强烈的竞争作用,IC50(半抑制浓度)与吸附量大小密切相关:细胞 2 约为 70 毫摩尔;细胞 3 约为 7 毫摩尔;细胞 4-6 约为 0.05 毫摩尔。麦芽寡糖(400 毫摩尔)没有影响,证实了互补性的作用。吸附的 [3H]cellopentaitol 的数量与纤维素的质量成正比。在测试的七种棉花中,野生型棉花纤维吸附[3H]cellopentaitol 的能力最弱,这表明它们的微纤维表面存在热效应,它们对纤维素酶消化的抵抗力也证实了这一点,这也可能归因于葡萄糖醛缩木糖含量较高。总之,[3H]胞五醇吸附是滴定 "裸 "纤维素表面的一种简单、灵敏和定量的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biochemical Journal
Biochemical Journal 生物-生化与分子生物学
CiteScore
8.00
自引率
0.00%
发文量
255
审稿时长
1 months
期刊介绍: Exploring the molecular mechanisms that underpin key biological processes, the Biochemical Journal is a leading bioscience journal publishing high-impact scientific research papers and reviews on the latest advances and new mechanistic concepts in the fields of biochemistry, cellular biosciences and molecular biology. The Journal and its Editorial Board are committed to publishing work that provides a significant advance to current understanding or mechanistic insights; studies that go beyond observational work using in vitro and/or in vivo approaches are welcomed. Painless publishing: All papers undergo a rigorous peer review process; however, the Editorial Board is committed to ensuring that, if revisions are recommended, extra experiments not necessary to the paper will not be asked for. Areas covered in the journal include: Cell biology Chemical biology Energy processes Gene expression and regulation Mechanisms of disease Metabolism Molecular structure and function Plant biology Signalling
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