Two extracellular endoxylanases from alkaliphilic Bacillus firmus differ in their synthesis |
| |
Authors: | Khanok Ratanakhanokchai Piyanoot Noiduang Khin Lay Kyu |
| |
Institution: | (1) School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok, 10140, Thailand |
| |
Abstract: | To investigate the synthesis of two extracellular endoxylanases, xylan-binding and unbound xylanases from an alkaliphilic Bacillus
firmus, washed cells were incubated in alkaline mineral salt media containing various carbon sources. The 23 kDa xylan-binding endoxylanase (XBE), which hydrolyses insoluble xylan, was produced before the 45 kDa, unbound endoxylanase. All the carbon sources tested at 5 mg ml–1, including glucose, induced production of XBE but the unbound xylanase was totally repressed by glucose. The production of XBE increased when glucose concentration increased but was not synthesized until the glucose in the medium was less than 1 mg ml–1. |
| |
Keywords: | alkaliphilic Bacillus firmus carbon sources extracellular endoxylanase unbound endoxylanase xylan-binding endoxylanase |
本文献已被 SpringerLink 等数据库收录! |
|