Fed-batch production of Thermomonospora fusca endoglucanase by recombinant Streptomyces lividans

✍ Scribed by Eunki Kim; Dong-Hoon Shin; Diana C. Irwin; David B. Wilson

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 163 KB
• Volume: 60
• Category: Article
• ISSN: 0006-3592
• DOI: 10.1002/(sici)1097-0290(19981005)60:1<70::aid-bit8>3.0.co;2-y

✦ Synopsis

The factors affecting the production of a Thermomonospora fusca endoglucanase by a recombinant Streptomyces lividans strain were studied in a fermentor with glucose addition controlled by a pH-stat. The recombinant plasmid was stable for 35 generations with constant endoglucanase productivity. Glucose and peptone were used as the carbon and nitrogen sources. Addition of Tween-80 increased endoglucanase production twofold. A significant decrease in endoglucanase production was observed at low aeration. During fed-batch cultivation, pulse feeding (6 g/L) of a glucose-ammonium sulfate solution was optimal for endoglucanase production. With higher concentrations of glucose (15 g/L), a significant amount of organic acid, including acetic acid, was produced, which inhibited cell growth and endoglucanase production. Under optimum conditions, 1.7 U/mL of endoglucanase were produced.