Effect of calcium ions on the organization of iota-carrageenan helices: an X-ray investigation

被引：75

作者：

Janaswamy, S ^{[1
]}

Chandrasekaran, R ^{[1
]}

机构：

[1] Purdue Univ, Whistler Ctr Carbohydrate Res, W Lafayette, IN 47907 USA

来源：

CARBOHYDRATE RESEARCH | 2002年 / 337卷 / 06期

关键词：

iota-carrageenan; X-ray diffraction; three-dimensional structure; junction zone;

D O I：

10.1016/S0008-6215(02)00017-4

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 [生物化学与分子生物学]; 081704 [应用化学];

摘要：

X-ray fiber diffraction analysis confirms that calcium t-carrageenan forms a threefold, right-handed, half-staggered, parallel, double helix of pitch 26.42 Angstrom stabilized by interchain hydrogen bonds. According to the detailed structural results, three helices are packed in a trigonal unit cell (a = 23.61 and e = 13.21 Angstrom). Strong interactions between the sulfate groups of neighboring helices, mediated by calcium ions and water molecules, are responsible for stabilizing the three-dimensional structure, (C) 2002 Elsevier Science Ltd. All rights reserved.

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页码：523 / 535

页数：13

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