Production of extracellular protein from Bacillus sp. WY-60

Bacillus sp. WY-60에 의한 균체외 단백질의 분비조건

A bacteria strain producing extracellular protein was isolated and identified from soil samples, and the optimum conditions of producing protein were investigated. Eleven strains of bacteria were isolated from soil samples. Among which WY-60 strain showed a very strong capability of producing protein and identified as a Bacillus sp. The optimum composition of nutrient medium for the production of the protein by WY-60 was fructose 4.0%, polypeptone 1.0%, $NH_4NO_3$ 0.1%, $K_2HPO_4$ 0.1%, $MgSO_4{\cdot}7H_2O$ 0.005%, $CaCO_3$ 1.0% and the optimum pH and temperature were 8.0 and $30^{\circ}C$, respectively. The penicillin G and lincomycin added to the above medium were effective for the protein production of the WY-60, but other antibiotics were non-effective. The maximum production of protein was obtained after 5 days culture.

미생물에 의한 균체외 단백질의 생산 및 그 분비조건에 관한 기초자료를 얻기 위해 토양으로 부터 단백질 생산균주 11주를 분리하여 그 중 단백질 생산능이 강한 WY-60 균주를 선정하여 동정한 결과, Bacillus sp.으로 확인되었다. WY-60 균주의 단백질생산 최적조건은 fructose 4.0%, polypeptone 1.0%, $NH_4NO_3$ 0.1%, $K_2HPO_4$ 0.1%, $MgSO_4{\cdot}7H_2O$ 0.005%, $CaCO_3$ 1.0%, pH 8.0 및 온도 $30^{\circ}C$이였다. WY-60 균주는 penicillin G와 lincomycin을 첨가시에 단백질 생산을 촉진하였고 그 외의 항생물질의 첨가시는 단백질 생산을 증가하는 효과가 없었다. 배양시간에 따른 단백질 생산은 배양 5일째에 0.214 mg/ml로 최대가 되었다.