Crystal structure of highly thermostable glycerol kinase from a hyperthermophilic archaeon in a dimeric form

The FEBS Journal
Y KogaS Kanaya

Abstract

The crystal structure of glycerol kinase from the hyperthermophilic archaeon Thermococcus kodakaraensis (Tk-GK) in a dimeric form was determined at a resolution of 2.4 A. This is the first crystal structure of a hyperthermophilic glycerol kinase. The overall structure of the Tk-GK dimer is very similar to that of the Escherichia coli glycerol kinase (Ec-GK) dimer. However, two dimers of Ec-GK can associate into a tetramer with a twofold axis, whereas those of Tk-GK cannot. This may be the reason why Tk-GK is not inhibited by fructose 1,6-bisphosphate, because the fructose 1,6-bisphosphate binding site is produced only when a tetrameric structure is formed. Differential scanning calorimetry analyses indicate that Tk-GK is a highly thermostable protein with a melting temperature (T(m)) of 105.4 degrees C for the major transition. This value is higher than that of Ec-GK by 34.1 degrees C. Comparison of the crystal structures of Tk-GK and Ec-GK indicate that there is a marked difference in the number of ion pairs in the alpha16 helix. Four ion pairs, termed IP1-IP4, are formed in this helix in the Tk-GK structure. To examine whether these ion pairs contribute to the stabilization of Tk-GK, four Tk-GK and four Ec-GK derivatives with...Continue Reading

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Citations

Jul 28, 2015·Canadian Journal of Microbiology·Stephen M J PolloCamilla L Nesbø
Oct 16, 2014·Molecular Microbiology·Emmanuel Oluwadare BalogunShigeharu Harada
Dec 20, 2020·International Journal of Molecular Sciences·Piotr WilkPrzemysław Grudnik

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