6vcw

Crystal structure of Medicago truncatula S-adenosylmethionine Synthase 3A (MtMAT3A)

spinqualitylabelsall models 6vcw, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6vcw is a 2 chain structure with sequence from Medicago truncatula. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.4Å Ligands: CL, EDO, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function G7L3W1_MEDTR Catalyzes the formation of S-adenosylmethionine from methionine and ATP.[RuleBase:RU000541] Publication Abstract from PubMed S-adenosylmethionine synthases (MATs) are responsible for production of S-adenosylmethionine, the cofactor essential for various methylation reactions, production of polyamines and phytohormone ethylene, etc. Plants have two distinct MAT types (I and II). This work presents the structural analysis of MATs from Arabidopsis thaliana (AtMAT1 and AtMAT2, both type I) and Medicago truncatula (MtMAT3a, type II), which, unlike most MATs, are dimers where three-domain subunits are sandwiched flat with one another. Although MAT types are very similar, their subunits are differently oriented within the dimer. Structural snapshots along the enzymatic reaction reveal the exact conformation of precatalytic methionine in the active site and show a binding niche, characteristic only for plant MATs, that may serve as a lock of the gate loop. Nevertheless, plants, in contrary to mammals, lack the MAT regulatory subunit, and the regulation of plant MAT activity is still puzzling. Our structures open a possibility of an allosteric activity regulation of type I plant MATs by linear compounds, like polyamines, which would tighten the relationship between S-adenosylmethionine and polyamine biosynthesis. S-adenosylmethionine synthases in plants: Structural characterization of type I and II isoenzymes from Arabidopsis thaliana and Medicago truncatula.,Sekula B, Ruszkowski M, Dauter Z Int J Biol Macromol. 2020 Feb 11. pii: S0141-8130(20)30238-5. doi:, 10.1016/j.ijbiomac.2020.02.100. PMID:32057875 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also S-adenosylmethionine synthetase 3D structures

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