RRC ID 34036
著者 Watanabe T, Shinozaki Y, Yoshida S, Koitabashi M, Sameshima-Yamashita Y, Fujii T, Fukuoka T, Kitamoto HK.
タイトル Xylose induces the phyllosphere yeast Pseudozyma antarctica to produce a cutinase-like enzyme which efficiently degrades biodegradable plastics.
ジャーナル J Biosci Bioeng
Abstract There is a need to speed up the degradation of used agricultural mulch films that are made of biodegradable plastics (BPs) in the field. Treating them with BP-degrading enzymes could be a solution to this problem. A cutinase-like enzyme of yeast Pseudozyma antarctica (PaE) has wide specificity of BPs degradation, but needs to be produced efficiently. Here we report that the production of PaE by P. antarctica can be increased by using xylose as carbon source. BP-degradation activity was analyzed using a polybutylene succinate-co-adipate (PBSA) emulsion as the substrate. Strain P. antarctica GB-4(1)W was found to be the best PaE producer among the tested strains. Using a 5-L jar fermentor with xylose fed-batch cultivation, high PaE productivity could be maintained and about 21 U/ml of PaE was obtained in 120 h. This amount was 100 times higher than the amount that we obtained previously (0.21 U/ml by flask cultivation using glycerol as carbon source). Under repeated xylose fed-batch cultivation with 24 h intervals, the maximum PaE production rate (0.34 U/ml/h) was maintained and the highest PaE productivity (28,000 U/2 L/d) was repeatedly obtained for 7 intervals. The activity of filtered jar-culture (crude PaE) was stable over 12 weeks at 4°C. Commercially available BP mulch films (20 μm thickness, cut into 1-cm-squares) were completely degraded by submerging them in crude PaE (2 U/ml) at 30°C in 24 h. These results indicated that concentrated PaE can rapidly degrade the strength of BP mulch films in the field so that they do not interfere with plowing.
巻・号 117(3)
ページ 325-9
公開日 2014-3-1
DOI 10.1016/j.jbiosc.2013.09.002
PII S1389-1723(13)00322-8
PMID 24095046
MeSH Biodegradable Plastics / metabolism* Bioreactors* Carboxylic Ester Hydrolases / metabolism* DNA, Fungal / genetics Glycerol / metabolism Polymerase Chain Reaction Polymers / metabolism Ustilaginales / enzymology* Xylose / metabolism*
IF 2.366
引用数 21
WOS 分野 FOOD SCIENCE & TECHNOLOGY BIOTECHNOLOGY & APPLIED MICROBIOLOGY
リソース情報
一般微生物 JCM 10317 JCM 10318 JCM 10323 JCM 10324