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( Yu Qi Qin ),( Yin Bo Qu ) 생화학분자생물학회 2014 BMB Reports Vol.47 No.5
To investigate the function of N-glycosylation of Cel5A(endoglucanase II) from Hypocrea jecorina, two N-glycosylationsite deletion Cel5A mutants (rN124D and rN124H) wereexpressed in Saccharomyces cerevisiae. The weights of theserecombinant mutants were 54 kDa, which were lower than thatof rCel5A. This result was expected to be attributed todeglycosylation. The enzyme activity of rN124H was greatlyreduced to 60.6% compared with rCel5A, whereas rN124Dshowed slightly lower activity (10%) than that of rCel5A. rN124Dand rN124H showed different thermal stabilities compared withthe glycosylated rCel5A, especially at lower pH value. Thermalstabilities were reduced and improved for rN124D and rN124H,respectively. Circular dichroism spectroscopy showed that themodification of secondary structure by mutation may be thereason for the change in enzymatic activity and thermal stability.[BMB Reports 2014; 47(5): 256-261]
Dong-Hui Hao,Xin Song,Jian-Qiang Lin,Yu-Jie Su,Yin-Bo Qu,Jian-Qun Lin 한국생물공학회 2008 Biotechnology and Bioprocess Engineering Vol.13 No.1
In this study, we describe the isolation and identification of a novel long-chain n-alkane degrading strain, Gordonia amicalis LH3. Under aerobic conditions, it utilized approximately 18.0% of paraffin (2% w/v) after 10 day of incubation, and the paraffin compositions of C18C24 alkalines were utilized preferentially. Under anaerobic conditions, paraffin utilization was approximately 1/8 that seen under aerobic conditions, and the compositions of C34 and C36 alkalines were utilized preferentially. The effects of salinity, temperature, and biosurfactants on paraffin degradation were also evaluated. The strain was also demonstrated to grow on oil, and decreased oil viscosity by 44.7% and degraded oil by 10.4% under aerobic conditions. Our results indicated that G. amicalis LH3 has potential applications in paraffin control, microbial enhanced oil recovery (MEOR), and the bioremediation of hydrocarbon-polluted environments.