Abstract:
:A gene (axe) encoding the AXE thermostable esterase in Thermobifida fusca NTU22 was cloned into a Yarrowia lipolytica P01g host strain. Recombinant expression resulted in extracellular esterase production at levels as high as 70.94 U/ml in Hinton flask culture broth, approximately 140 times higher than observed in a Pichia pastoris expression system. After 72 h of fermentation by the Y. lipolytica transformant in the fed-batch fermentor, the fermentation broth accumulated 41.11 U/ml esterase activity. Rice bran, wheat bran, bagasse and corncob were used as hydrolysis substrates for the esterase, with corncob giving the best ferulic acid yield. The corncob was incubated with T. fusca xylanase (Tfx) for 12h and then with the AXE esterase for an additional 12h. Ferulic acid accumulated to 396 μM in the culture broth, a higher concentration than with esterase alone or with Tfx and esterase together for 24 h.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Huang YC,Chen YF,Chen CY,Chen WL,Ciou YP,Liu WH,Yang CHdoi
10.1016/j.biortech.2011.05.062subject
Has Abstractpub_date
2011-09-01 00:00:00pages
8117-22issue
17eissn
0960-8524issn
1873-2976pii
S0960-8524(11)00747-4journal_volume
102pub_type
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