Structural, Biochemical, and Evolutionary Characterizations of Glyoxylate/Hydroxypyruvate Reductases Show Their Division into Two Distinct Subfamilies
- Univ. of Virginia, Charlottesville, VA (United States); Univ. of Warsaw (Poland)
- Univ. of Virginia, Charlottesville, VA (United States)
- Univ. of Warsaw (Poland)
The d-2-hydroxyacid dehydrogenase (2HADH) family illustrates a complex evolutionary history with multiple lateral gene transfers and gene duplications and losses. As a result, the exact functional annotation of individual members can be extrapolated to a very limited extent. Here, we revise the previous simplified view on the classification of the 2HADH family; specifically, we show that the previously delineated glyoxylate/hydroxypyruvate reductase (GHPR) subfamily consists of two evolutionary separated GHRA and GHRB subfamilies. We compare two representatives of these subfamilies from Sinorhizobium meliloti (SmGhrA and SmGhrB), employing a combination of biochemical, structural, and bioinformatics approaches. Our kinetic results show that both enzymes reduce several 2-ketocarboxylic acids with overlapping, but not equivalent, substrate preferences. SmGhrA and SmGhrB show highest activity with glyoxylate and hydroxypyruvate, respectively; in addition, only SmGhrB reduces 2-keto-d-gluconate, and only SmGhrA reduces pyruvate (with low efficiency). We present nine crystal structures of both enzymes in apo forms and in complexes with cofactors and substrates/substrate analogues. In particular, we determined a crystal structure of SmGhrB with 2-keto-d-gluconate, which is the biggest substrate cocrystallized with a 2HADH member. Here, the structures reveal significant differences between SmGhrA and SmGhrB, both in the overall structure and within the substrate-binding pocket, offering insight into the molecular basis for the observed substrate preferences and subfamily differences. In addition, we provide an overview of all GHRA and GHRB structures complexed with a ligand in the active site.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Michigan Economic Development Corporation; Michigan Technology Tri-Corridor; NIGMS; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1424792
- Journal Information:
- Biochemistry, Journal Name: Biochemistry Journal Issue: 6 Vol. 57; ISSN 0006-2960
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Purification and properties of hydroxypyruvate: L-alanine transaminase from rabbit liver
Extent and Origins of Functional Diversity in a Subfamily of Glycoside Hydrolases
Metabolism of hydroxypyruvate in a mutant of barley lacking NADH-dependent hydroxypyruvate reductase, an important photorespiratory enzyme activity
Journal Article
·
Fri Nov 30 23:00:00 EST 1973
· Arch. Biochem. Biophys.; (United States)
·
OSTI ID:7230450
Extent and Origins of Functional Diversity in a Subfamily of Glycoside Hydrolases
Journal Article
·
Thu Mar 14 20:00:00 EDT 2019
· Journal of Molecular Biology
·
OSTI ID:1546759
Metabolism of hydroxypyruvate in a mutant of barley lacking NADH-dependent hydroxypyruvate reductase, an important photorespiratory enzyme activity
Journal Article
·
Fri Sep 01 00:00:00 EDT 1989
· Plant Physiology; (USA)
·
OSTI ID:5914625