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• W2060622745 abstract "Glucokinase genes, found in the genome databases of Trypanosoma cruzi and Leishmania major, were cloned and sequenced. Their expression in Escherichia coli resulted in the synthesis of soluble and active enzymes, TcGlcK and LmjGlcK, with a molecular mass of 43 kDa and 46 kDa, respectively. The enzymes were purified, and values of their kinetic parameters determined. The Km values for glucose were 1.0 mM for TcGlcK and 3.3 mM for LmjGlcK. For ATP, the Km values were 0.36 mM (TcGlcK) and 0.35 mM (LmjGlcK). A lower Km value for glucose (2.55 mM) was found when the (His)6-tag was removed from the recombinant LmjGlcK, whereas the TcGlcK retained the same value. The Vmax's of the T. cruzi and L. major GlcKs were 36.3 and 30.9 U/mg of protein, respectively. No inhibition was exerted by glucose-6-phosphate. Similarly, no inhibition by inorganic pyrophosphate was found in contrast to previous observations made for the T. cruzi and L. mexicana hexokinases. Both trypanosomatid enzymes were only able to phosphorylate glucose indicating that they are true glucokinases. Gel-filtration chromatography showed that the GlcK of both trypanosomatids may occur as a monomer or dimer, dependent on the protein concentration. Both GlcK sequences have a type-1 peroxisome-targeting signal. Indeed, they were shown to be present inside glycosomes using three different methods. These glucokinases present highest, albeit still a moderate 24% sequence identity with their counterpart from Trichomonas vaginalis, which has been classified into group A of the hexokinase family. This group comprises mainly eubacterial and cyanobacterial glucokinases. Indeed, multiple sequence comparisons, as well as kinetic properties, strongly support the notion that these trypanosomatid enzymes belong to group A of the hexokinases, in which they, according to a phylogenetic analysis, form a separate cluster." @default.
• W2060622745 created "2016-06-24" @default.
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• W2060622745 date "2007-12-01" @default.
• W2060622745 modified "2023-10-02" @default.
• W2060622745 title "Molecular and biochemical characterization of novel glucokinases from Trypanosoma cruzi and Leishmania spp." @default.
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• W2060622745 doi "https://doi.org/10.1016/j.molbiopara.2007.08.007" @default.
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