Molecular structure of the rhamsan-like exocellular polysaccharide RMDP17 from Sphingomonas paucimobilis. |
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Authors: | Wen Bian Rengaswami Chandrasekaran Marguerite Rinaudo |
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Institution: | Whistler Center for Carbohydrate Research, 1160 Food Science Building, Purdue University, West Lafayette, IN 47907-1160, USA. |
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Abstract: | X-Ray diffraction analysis of the sodium salt of the polysaccharide RMDP17, a 2-deoxy rhamsan analog, reveals that it adopts a gellan-like, half-staggered, threefold, left handed, double helix of pitch 57.4 A. The side chain of the branched polymer is hydrogen bonded to the main chain. Sodium ions, linked to the carboxylate groups, promote the association of helices via water molecules. Two helices of opposite polarity occupy a trigonal unit cell of dimensions a=17.6 and c=28.7 A. The packing arrangement displays a series of hydrogen bonds involving main chain and side chain atoms, as well as some water bridges, between the helices. |
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Keywords: | RMDP17 X-ray diffraction Three-dimensional structure Rhamsan analog |
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