5dj1

Structure of the PLP-Dependent L-Arginine Hydroxylase MppP Holoenzyme

spinqualitylabelsall models 5dj1, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5dj1 is a 4 chain structure with sequence from Streptomyces wadayamensis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.102Å Ligands: CL, LLP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A0X1KHF5_9ACTN Publication Abstract from PubMed l-Enduracididine (l-End) is a nonproteinogenic amino acid found in a number of bioactive peptides, including the antibiotics teixobactin, enduracidin, and mannopeptimycin. The potent activity of these compounds against antibiotic-resistant pathogens like MRSA and their novel mode of action have garnered considerable interest for the development of these peptides into clinically relevant antibiotics. This goal has been hampered, at least in part, by the fact that l-End is difficult to synthesize and not currently commercially available. We have begun to elucidate the biosynthetic pathway of this unusual building block. In mannopeptimycin-producing strains, like Streptomyces wadayamensis, l-End is produced from l-Arg by the action of three enzymes: MppP, MppQ, and MppR. Herein, we report the structural and functional characterization of MppP. This pyridoxal 5'-phosphate (PLP)-dependent enzyme was predicted to be a fold type I aminotransferase on the basis of sequence analysis. We show that MppP is actually the first example of a PLP-dependent hydroxylase that catalyzes a reaction of l-Arg with dioxygen to yield a mixture of 2-oxo-4-hydroxy-5-guanidinovaleric acid and 2-oxo-5-guanidinovaleric acid in a 1.7:1 ratio. The structure of MppP with PLP bound to the catalytic lysine residue (Lys221) shows that, while the tertiary structure is very similar to those of the well-studied aminotransferases, there are differences in the arrangement of active site residues around the cofactor that likely account for the unusual activity of this enzyme. The structure of MppP with the substrate analogue d-Arg bound shows how the enzyme binds its substrate and indicates why d-Arg is not a substrate. On the basis of this work and previous work with MppR, we propose a plausible biosynthetic scheme for l-End. Streptomyces wadayamensis MppP Is a Pyridoxal 5'-Phosphate-Dependent l-Arginine alpha-Deaminase, gamma-Hydroxylase in the Enduracididine Biosynthetic Pathway.,Han L, Schwabacher AW, Moran GR, Silvaggi NR Biochemistry. 2015 Nov 17. PMID:26551990 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hydroxylases 3D structures

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