Home
Resources
Publications
Macromolecular Pullulan Produced by Aureobasidium Melanogenum 13-2 Isolated From the Taklimakan Desert and Its Crucial Roles in Resistance to the Stress Treatments

Macromolecular Pullulan Produced by Aureobasidium Melanogenum 13-2 Isolated From the Taklimakan Desert and Its Crucial Roles in Resistance to the Stress Treatments

Hong Jiang, Tie-Jun Chen, Zhe Chi, Zhong Hu, Guang-Lei Liu, Yi Sun, Shu-Hang Zhang, Zhen-Ming Chi

Int J Biol Macromol. 2019 Aug 15;135:429-436.

PMID: 31145957

Abstract:

A novel yeast strain Aureobasidium melanogenum 13-2 isolated from the Taklimakan desert was found to be able to produce a high level of extracellular polysaccharide (EPS). Under the optimal conditions, the yeast strain could yield 73.25 ± 2.3 g/L of EPS within 5 days at a flask level. During a 10-liter fermentation, the yeast strain could produce 78.05 ± 3.5 g/L of EPS within 120 h. The FT-IR spectra of the standard pullulan from Sigma and the purified EPS produced by A. melanogenum 13-2 were almost identical and the purified EPS could be actively hydrolyzed by a pullulanase, demonstrating that the purified EPS was pullulan. The molecular weight (Mw) of the purified pullulan was estimated to be 7.703 × 105 g/moL. Disruption of a pullulan synthase gene (PUL1) made a mutant DAG27 lose the ability to synthesize any pullulan. The mutant DAG27 was more sensitive to radiation of UV light, high NaCl concentration, heat treatment, strong oxidation of H2O2 and desiccation than its wild type strain 13-2, suggesting that the produced pullulan could play an important role in resistance of the yeast cells to various stresses. This was the first time to show that the yeast strain obtained from the desert could produce such high level pullulan and the produced pullulan had an obviously protective effect on its producer.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS21280	Pullulan Standard			Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: