Nucleoside Diphosphate Kinase from Psychrophilic Pseudoalteromonas Sp. AS-131 Isolated from Antarctic Ocean
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Nucleoside diphosphate kinase isolated from psychrophilic Pseudoalteromonas sp. AS-131 (ASNDK) was expressed in Escherichia coli and purified to homogeneity. Comparing to mesophilic NDK isolated from Pseudomonas aeruginosa, ASNDK exhibited highly elevated thermolability: E. coli expression at 37 °C as a denatured insoluble form, 30 °C lower optimum temperature of enzymatic activity, and greatly reduced heat stability with 38 °C lower Tm value, fourfold higher Km and reduced Kcat/Km by 0.4-fold upon reaction temperature increase from 20 to 37 °C. The subunit structure of ASNDK was suggested to be dimer, as in NDKs isolated from moderate halophiles.
Structure, Folding and Stability of Nucleoside Diphosphate Kinases.
Georgescauld F, Song Y, Dautant A Int J Mol Sci. 2020; 21(18).
PMID: 32947863 PMC: 7554756. DOI: 10.3390/ijms21186779.
Tokunaga H, Maeda J, Arakawa T, Tokunaga M Protein J. 2017; 36(3):228-237.
PMID: 28425008 DOI: 10.1007/s10930-017-9715-0.