Search results for: E. coli MutY Enzyme & Buffer
#31305080 
2019/07/15
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Characterization of Residue Specific Protein Folding and Unfolding Dynamics in Cells.
In this work, we measured the millisecond residue specific protein folding and unfolding dynamics in cells for two protein GB3 mutants using NMR. The results show that the protein folding and unfolding dynamics in cells is different from that in buffer. Through a two-site exchange model, it is shown that both the population and the exchange rate are changed by the cellular environment. Further investigation suggests that the change is likely due to the quinary interaction with crowded molecules in the cell. Our work underlines the importance of cellular environment to protein folding kinetics and thermodynamics although this environmental effect may not be large enough to change the protein structure.Xiangfei Song, Tianhang Lv, Jingfei Chen, Jia Wang, Lishan Yao
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Adenine excisional repair function of MYH protein on the adenine:8-hydroxyguanine base pair in double-stranded DNA.
Adenine paired with 8-hydroxyguanine (oh(8)G), a major component of oxidative DNA damage, is excised by MYH base excision repair protein in human cells. Since repair activity of MYH protein on an A:G mismatch has also been reported, we compared the repair activity of His(6)-tagged MYH proteins, expressed in Spodoptera frugiperda Sf21 cells, on A:oh(8)G and A:G mismatches by DNA cleavage assay and gel mobility shift assay. We also compared the repair ability of type 1 mitochondrial protein with type 2 nuclear protein, as well as of polymorphic type 1-Q(324) and 2-Q(310) proteins with type 1-H(324) and 2-H(310) proteins by DNA cleavage assay and complementation assay of an Escherichia coli mutM mutY strain. In a reaction buffer with a low salt (0-50 mM) concentration, adenine DNA glycosylase activity of type 2 protein was detected on both A:oh(8)G and A:G substrates. However, in a reaction buffer with a 150 mM salt concentration, similar to physiological conditions, the glycosylase activity on A:G, but not on A:oh(8)G, was extremely reduced and the binding activity of type 2 protein for A:G, but not for A:oh(8)G, was proportionally reduced. The glycosylase activity on A:oh(8)G and the ability to suppress spontaneous mutagenesis were greater for type 2 than type 1 enzyme. There was apparently no difference in the repair activities between the two types of polymorphic MYH proteins. These results indicate that human MYH protein specifically catalyzes the glycosylase reaction on A:oh(8)G under physiological salt concentrations.K Shinmura, S Yamaguchi, T Saitoh, M Takeuchi-Sasaki, S R Kim, T Nohmi, J Yokota