6xj4

Triuret Hydrolase (TrtA) from Herbaspirillum sp. BH-1 C162S bound with biuret

spinqualitylabelsall models 6xj4, resolution 1.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6xj4 is a 4 chain structure with sequence from Herbaspirillum sp. BH-1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.78Å Ligands: C5J, EDO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A2N6JFX7_9BURK Publication Abstract from PubMed Triuret (carbonyldiurea) is an impurity found in industrial urea fertilizer (<0.1% w/w) that is applied, worldwide, around 300 million pounds each year on agricultural lands. In addition to anthropogenic sources, endogenous triuret has been identified in amoeba and human urine, the latter being diagnostic for hypokalemia. The present study is the first to describe the metabolic breakdown of triuret, which funnels into biuret metabolism. We identified the gene responsible for triuret decomposition (trtA) in bacterial genomes, clustered with biuH, that encodes biuret hydrolase and has close protein sequence homology. TrtA is a member of the isochorismatase-like hydrolase protein family (IHL), similarly to BiuH, and has a catalytic efficiency (kcat/KM) of 6 x 10(5) (M(-1)s(-1)), a KM for triuret of 20 muM, and exquisite substrate specificity. Indeed, TrtA has four orders of magnitude less activity with biuret. Crystal structures of TrtA in apo and holo form were solved and compared to the BiuH structure. The high substrate selectivity was found to be conveyed by second shell residues around each active site. Mutagenesis of residues conserved in TrtA to the alternate consensus found in BiuHs revealed residues critical to triuret hydrolase activity but no single mutant evolved more biuret activity and likely a combination of mutations is required to interconvert between TrtA, BiuH functions. TrtA-mediated triuret metabolism is relatively rare in recorded genomes (1-2%), but is largely found in plant-associated, nodulating and endophytic bacteria. This study suggests functions for triuret hydrolase in certain eukaryotic intermediary processes and prokaryotic intermediary or biodegradative metabolism. Discovery of an ultra-specific triuret hydrolase (TrtA) establishes the triuret biodegradation pathway.,Tassoulas LJ, Elias MH, Wackett LP J Biol Chem. 2020 Nov 10. pii: RA120.015631. doi: 10.1074/jbc.RA120.015631. PMID:33172891 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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