8ixm | pdb_00008ixm

Pseudomoans Aerugiona Wildtype Ketopantoate Reductase ternary complex with NADP+ and alpha-Ketoisocaproic acid

spinqualitylabelsall models 8ixm, resolution 1.96Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8ixm is a 2 chain structure with sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.96Å Ligands: COI, GOL, NAP, NHE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9I2Y5_PSEAE Catalyzes the NADPH-dependent reduction of ketopantoate into pantoic acid.[RuleBase:RU362068] Publication Abstract from PubMed Theoretical concepts linking the structure, function, and evolution of a protein, while often intuitive, necessitate validation through investigations in real-world systems. Our study empirically explores the evolutionary implications of multiple gene copies in an organism by shedding light on the structure-function modulations observed in Pseudomonas aeruginosa's second copy of ketopantoate reductase (PaKPR2). We demonstrated with two apo structures that the typical active site cleft of the protein transforms into a two-sided pocket where a molecular gate made up of two residues controls the substrate entry site, resulting in its inactivity toward the natural substrate ketopantoate. Strikingly, this structural modification made the protein active against several important alpha-keto-acid substrates with varied efficiency. Structural constraints at the binding site for this altered functional trait were analyzed with two binary complexes that show the conserved residue microenvironment faces restricted movements due to domain closure. Finally, its mechanistic highlights gathered from a ternary complex structure help in delineating the molecular perspectives behind its kinetic cooperativity toward these broad range of substrates. Detailed structural characteristics of the protein presented here also identified four key amino acid residues responsible for its versatile alpha-keto-acid reductase activity, which can be further modified to improve its functional properties through protein engineering. Implication of Molecular Constraints Facilitating the Functional Evolution of Pseudomonas aeruginosa KPR2 into a Versatile alpha-Keto-Acid Reductase.,Basu Choudhury G, Datta S Biochemistry. 2024 Jul 16;63(14):1808-1823. doi: 10.1021/acs.biochem.4c00087. , Epub 2024 Jul 4. PMID:38962820 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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