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Evaluating SAXS Results on Aqueous Solutions of Various Bacterial Levan Utilizing the String-of-Beads Model

Evaluating SAXS Results on Aqueous Solutions of Various Bacterial Levan Utilizing the String-of-Beads Model

Elizabeta Benigar, Matija Tomšič, Simon Sretenovic, David Stopar, Andrej Jamnik, Iztok Dogsa

Acta Chim Slov. 2015;62(3):509-17.

PMID: 26454583

Abstract:

Polysaccharide levan is a homopolymer of fructose and is an important component of plants, yeast, fungi and some bacterial biofilms. In this paper we report on the structural properties of aqueous solutions of bacterial levan utilizing smallangle X-ray scattering and light microscopy. In addition to commercially available levan isolated from Zymomonas mobilis and Erwinia herbicola, we also studied levan isolated and purified from the biofilm of Bacillus subtilis. The smallangle X-ray scattering data were analyzed by the string-of-beads model that revealed qualitative differences in the structure of levan molecules. Levan can be represented as a semi-flexible chain that interacts intra- and inter-molecularly and therefore forms various suprastructures on larger size scales. Increasing the concentration of levan makes the levan structure more compact, which was observed on the nano as well as on the micro scale. The structures with most homogeneously distributed polymer local density were found in B. subtilis levan solutions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9013950	Levan from Erwinia herbicola		9013-95-0	Price

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