The hydrogen-bond network around Glu160 contributes to the structural stability of chitosanase CsnA from Renibacterium sp. QD1
| Autor: | Xinzhi Lu, Wengong Yu, Rilei Yu, Yujuan Han, Peixin Gao |
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| Rok vydání: | 2018 |
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Molecular 0301 basic medicine Circular dichroism Glycoside Hydrolases Protein Conformation 030106 microbiology Mutant Gene Expression Glutamic Acid Sequence alignment Biochemistry 03 medical and health sciences Enzyme activator Protein structure Structural Biology Enzyme Stability Amino Acid Sequence Chitosanase Molecular Biology Thermostability Calorimetry Differential Scanning Molecular Structure Chemistry Hydrogen bond Circular Dichroism Hydrogen Bonding General Medicine Actinobacteria Enzyme Activation 030104 developmental biology Mutation Biophysics |
| Zdroj: | International Journal of Biological Macromolecules. 109:880-887 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2017.11.071 |
| Popis: | CsnA, a chitosanase from Renibacterium sp. QD1, has great potential for industrial applications due to its high yield and broad pH stability. In this study, a specific Glu160 in CsnA was identified by sequence alignment, and structural analysis and MD simulation predicted that Glu160 formed a hydrogen-bond network with Lys163 and Thr114. To evaluate the effect of the network, we constructed four mutants, including E160A, E160Q, K163A, and T114A, which partially or completely destroy this network. Characterization of these mutants demonstrated that the disruption of the network significantly decreased the enzyme thermostability. The underlying mechanisms responsible for the change of thermostability analyzed by circular dichroism spectroscopy revealed that the hydrogen-bond network conferred the structural stability of CsnA. Moreover, the length of the side chain of residue at 160 impacted conformational stability of the enzyme. Taken together, the hydrogen-bond network around Glu160 plays important roles in stabilization of CsnA. |
| Databáze: | OpenAIRE |
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