Abstract
Plasmid pCX311, which we constructed, has two HindlU DNA fragments (2.6 kbp and 2.0 kbp) of alkalophilic Bacillus sp. strain C-125 in the HindlU site of pBR322.These two fragments were essential not only for the xylanase production but also for the excretion of periplasmic proteins. The cloned 4.6 kbp fragment encodes some components that made the outer membrane of E. coli permeable. Some proteins such as xylanase and ²-lactamase were excreted, but alkaline phosphatase was not excreted into the culture broth.
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