Impaired folate binding of serine hydroxymethyltransferase 8 from soybean underlies resistance to the soybean cyst nematode
Journal Article
·
· Journal of Biological Chemistry
- Univ. of Missouri, Columbia, MO (United States)
Management of the agricultural pathogen soybean cyst nematode (SCN) relies on the use of SCN-resistant soybean cultivars, a strategy that has been failing in recent years. An underutilized source of resistance in the soybean genotype Peking is linked to two polymorphisms in serine hydroxy-methyltransferase 8 (SHMT8). SHMT is a pyridoxal 5'-phosphate–dependent enzyme that converts L-serine and (6S)-tetrahydrofolate to glycine and 5,10-methylenetetrahydrofolate. In this work, we determined five crystal structures of the 1884-residue SHMT8 tetramers from the SCN-susceptible cultivar (cv.) Essex and the SCN-resistant cv. Forrest (whose resistance is derived from the SHMT8 polymorphisms in Peking); the crystal structures were determined in complex with various ligands at 1.4–2.35 Å resolutions. We find that the two Forrest-specific polymorphic substitutions (P130R and N358Y) impact the mobility of a loop near the entrance of the (6S)-tetrahydrofolate–binding site. Ligand-binding and kinetic studies indicate severely reduced affinity for folate and dramatically impaired enzyme activity in Forrest SHMT8. These findings imply widespread effects on folate metabolism in soybean cv. Forrest that have implications for combating the widespread increase in virulent SCN.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS
- Sponsoring Organization:
- Missouri Soybean Mercchanising Council; National Institute of Food and Agriculture (NIFA); National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); USDA; USDOE Office of Science (SC); University of Missouri Bond Life Sciences Center
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357
- OSTI ID:
- 1616596
- Alternate ID(s):
- OSTI ID: 1767199
- Journal Information:
- Journal of Biological Chemistry, Journal Name: Journal of Biological Chemistry Journal Issue: 11 Vol. 295; ISSN 0021-9258
- Publisher:
- American Society for Biochemistry and Molecular BiologyCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
59 BASIC BIOLOGICAL SCIENCES
Glycine max
X-ray crystallography
disease resistance
enzyme
folate
host-pathogen interaction
ligand-binding protein
plant defense
quantitative trait loci (QTL)
serine hydroxymethyltransferase 8 (SHMT8)
soybean cyst nematode
59 BASIC BIOLOGICAL SCIENCES
Glycine max
X-ray crystallography
disease resistance
enzyme
folate
host-pathogen interaction
ligand-binding protein
plant defense
quantitative trait loci (QTL)
serine hydroxymethyltransferase 8 (SHMT8)
soybean cyst nematode