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http://dx.doi.org/10.5352/JLS.2007.17.2.211

Effect of temperature and denaturation conditions on protein folding assisted by GroEL-GroES chaperonin  

Bae, Yu-Jin (Department of Biomaterial Control (BK21 program), Dong-Eui University)
Jang, Kyoung-Jin (Department of Biomaterial Control (BK21 program), Dong-Eui University)
Jeon, Sung-Jong (Department of Biomaterial Control (BK21 program), Dong-Eui University, Department of Biotechnology & Bioengineering, Dong-Eui University)
Nam, Soo-Wan (Department of Biomaterial Control (BK21 program), Dong-Eui University, Department of Biotechnology & Bioengineering, Dong-Eui University)
Lee, Jae-Hyung (Department of Biomaterial Control (BK21 program), Dong-Eui University, Department of Biotechnology & Bioengineering, Dong-Eui University)
Kim, Young-Man (Department of Food and Nutrition/Oriental Biotech Co., Dong-Eui University)
Kim, Dong-Eun (Department of Biomaterial Control (BK21 program), Dong-Eui University, Department of Biotechnology & Bioengineering, Dong-Eui University)
Publication Information
Journal of Life Science / v.17, no.2, 2007 , pp. 211-217 More about this Journal
Abstract
The goal of this study is to investigate effects of temperature and co-chaperonin requirement for in vitro protein refolding assisted by E. coli chaperone GroEL under permissive and nonpermissive temperature conditions. In vitro protein refolding of two denatured proteins was kinetically investigated under several conditions in the presence of GroEL. Effects of temperature and GroES-requirement on the process of prevention of protein aggregation and refolding of denatured protein were extensively monitored. We have found that E. coli GroEL chaperone system along with ATP is required for invitro refolding of unfolded polypeptide under nonpermissive temperature of $37^{\circ}C$. However, under permissive condition spontaneous refolding can occur due to lower temperature, which can competes with chaperone-mediated protein refolding via GroEL chaperone system. Thus, GroEL seemed to divert spontaneous refolding pathway of unfolded polypeptide toward chaperone-assisted refolding pathway, which is more efficient protein refolding pathway.
Keywords
Chaperone; GroEL/GroES; Protein aggregation; Protein refolding;
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