Abstract
Despite physiological importance of aldonic sugar acids for living organisms, little is known about metabolic pathways of these compounds. Here, we investigated the functional diversity of homologs of L-threonic acid dehydrogenase (ThrDH; UniProt ID: Q0KBC7), an enzyme composed of two NAD-binding domains (PF14833 and PF03446). Ten ThrDH homologs with different genomic context were studied; seven new enzymatic activities were identified, such as (R)-pantoate dehydrogenase, L-altronic acid dehydrogenase, 6-deoxy-L-talonate dehydrogenase, L-idonic acid dehydrogenase, D-xylonic acid dehydrogenase, D-gluconic acid dehydrogenase, and 2-hydroxy-3-oxopantoate reductase activities. Two associated metabolic pathways were identified: L-idonic acid dehydrogenase was found to be involved in the degradation of L-idonic acid through oxidation/decarboxylation in Agrobacterium radiobacter K84, while 2-hydroxy-3-oxopantoate reductase was found to participate in D-glucarate catabolism through dehydration/cleavage in Ralstonia metallidurans CH34.
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Abbreviations
- EryDH:
-
D-erythronic acid dehydrogenase
- PanDH:
-
(R)-pantoate dehydrogenase
- SSN:
-
sequence similarity network
- ThrDH:
-
L-threonic acid dehydrogenase
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This work was supported by the National Natural Science Foundation of China (project No. 31970087) and the start-up grant from the South China Normal University.
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Zhang, C., Liu, Y., Wu, X. et al. Substrate Diversity of L-Threonic Acid Dehydrogenase Homologs. Biochemistry Moscow 85, 463–471 (2020). https://doi.org/10.1134/S0006297920040069
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DOI: https://doi.org/10.1134/S0006297920040069