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Phosphoglycerate kinase acts as a futile cycle at high temperature.

Abstract (Expand)

In (hyper)thermophilic organisms metabolic processes have to be adapted to function optimally at high temperature. We compared the gluconeogenic conversion of 3-phosphoglycerate via 1,3-bisphosphoglycerate … to glyceraldehyde-3-phosphate at 30 degrees C and at 70 degrees C. At 30 degrees C it was possible to produce 1,3-bisphosphoglycerate from 3-phosphoglycerate with phosphoglycerate kinase, but at 70 degrees C, 1,3-bisphosphoglycerate was dephosphorylated rapidly to 3-phosphoglycerate, effectively turning the phosphoglycerate kinase into a futile cycle. When phosphoglycerate kinase was incubated together with glyceraldehyde 3-phosphate dehydrogenase it was possible to convert 3-phosphoglycerate to glyceraldehyde 3-phosphate, both at 30 degrees C and at 70 degrees C, however, at 70 degrees C only low concentrations of product were observed due to thermal instability of glyceraldehyde 3-phosphate. Thus, thermolabile intermediates challenge central metabolic reactions and require special adaptation strategies for life at high temperature.

Authors: T. Kouril, J. J. Eicher, B. Siebers, J. L. Snoep

Date Published: 7th Oct 2017

Publication Type: Not specified

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