scholarly journals Production of Xanthanases by Paenibacillus spp.: Complete Xanthan Degradation and Possible Applications

2017 ◽  
Vol 15 (2) ◽  
pp. 120-127
Author(s):  
Simin Ashraf ◽  
Mohammad Reza Soudi ◽  
Parinaz Ghadam
Keyword(s):  
Xanthan Degradation

scholarly journals A Pyruvated Mannose-Specific Xanthan Lyase Involved in Xanthan Degradation by Paenibacillus alginolyticusXL-1

1999 ◽  
Vol 65 (6) ◽  
pp. 2446-2452 ◽  
Author(s):  
Harald J. Ruijssenaars ◽  
Jan A. M. de Bont ◽  
Sybe Hartmans
Keyword(s):  
Molecular Weight ◽  
Molecular Mass ◽  
Enzymatic Degradation ◽  
Degradation Products ◽  
Side Chain ◽  
Low Molecular Weight ◽  
Degrading Enzymes ◽  
Degrading Bacterium ◽  
Xanthan Degradation

ABSTRACT The xanthan-degrading bacterium Paenibacillus alginolyticus XL-1, isolated from soil, degrades approximately 28% of the xanthan molecule and appears to leave the backbone intact. Several xanthan-degrading enzymes were excreted during growth on xanthan, including xanthan lyase. Xanthan lyase production was induced by xanthan and inhibited by glucose and low-molecular-weight enzymatic degradation products from xanthan. A xanthan lyase with a molecular mass of 85 kDa and a pI of 7.9 was purified and characterized. The enzyme is specific for pyruvated mannosyl side chain residues and optimally active at pH 6.0 and 55°C.

Xanthan and gellan degradation by bacteria of activated sludge

2009 ◽  
Vol 60 (4) ◽  
pp. 965-973 ◽  
Author(s):  
M. Muchová ◽  
J. Růžička ◽  
M. Julinová ◽  
M. Doležalová ◽  
J. Houser ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Carbohydrate Polymers ◽  
Degrading Bacteria ◽  
Prosthecate Bacterium ◽  
Xanthan Degradation

Owing to increasing amounts of xanthan and gellan in food, cosmetics and pharmaceuticals, as well as in some technical spheres, studies were carried out on the xanthan and gellan degrading bacteria present in activated sludge. The activated sludge used in the study was able to degrade both carbohydrates over 7 days, with levels of xanthan and gellan utilizing microbes estimated at 105 cells/g of dry sludge weight. Isolating key degrading bacteria revealed the important role of genus Paenibacillus in xanthan degradation and prosthecate bacterium Verrucomicrobium sp. GD, which was capable of gellan utilization. Further tests performed with both strains showed they were able to degrade other types of carbohydrate polymers, and that Verrucomicrobium sp. GD did not possess extracellular free gellan depolymerase.

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