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ADP-dependent phosphofructokinases from the archaeal order Methanosarcinales display redundant glucokinase activity. | LitMetric

ADP-dependent phosphofructokinases from the archaeal order Methanosarcinales display redundant glucokinase activity.

Arch Biochem Biophys

Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile. Electronic address:

Published: November 2017

AI Article Synopsis

Article Abstract

The genome of Methanosarcinales organisms presents both ADP-dependent glucokinase and phosphofructokinase genes. However, Methanococcoides burtonii has a truncate glucokinase gene with a large deletion at the C-terminal, where the catalytic GXGD motif is located. Characterization of its phosphofructokinase annotated protein shows that is a bifunctional enzyme able to supply the absence of the glucokinase activity. Moreover, kinetic analyses of the phosphofructokinase annotated enzyme from, Methanohalobium evestigatum demonstrated that this enzyme is also bifunctional. The high conservation of the active site residues of all the enzymes from the order Methanosarcinales suggest that they should be bifunctional, as was previously reported for the ADP-dependent kinases from Methanococcales, highlighting the redundancy of the glucokinase activity in this archaeal group. The presence of active glycolytic enzymes would be important when glycogen storage of these organisms needs to be degraded to be used as energy source. Kinetic and structural information allows us to establish a substrate specificity signature that identifies specific GK or PFK, and bifunctional enzymes in this family.

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Source
http://dx.doi.org/10.1016/j.abb.2017.09.008DOI Listing

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