IMPROVED PRODUCTION OF MANNANASE BY STREPTOMYCES-LIVIDANS

Replacement of the natural promoter of the beta-mannanase gene of Stre ptomyces lividans by lacp resulted in a 15-fold increase in enzyme pro duction over that of the previously reported clone S. lividans IAF36, a clone carrying multiple copies of manA and a 350-fold increase over that of the wild-type strain S. lividans 1326. In addition, the use of lacp in tile shuttle vector pIAF199 allowed synthesis of the enzymes on carbon sources that did not contain mannan, such as xylan and whey, which offers interesting possibilities for industrial production of t he enzyme.