4ee6

Crystal Structure of the Novel Phenazine Prenyltransferase EpzP (methylated)

spinqualitylabelsall models 4ee6, resolution 1.33Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ee6 is a 2 chain structure with sequence from Streptomyces virginiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.33Å Ligands: CL, MG, MLY, MLZ, PG4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function E5KWG9_STRVG Publication Abstract from PubMed Prenyltransferases (PTs) catalyze the regioselective transfer of prenyl moieties onto aromatic substrates in biosynthetic pathways of microbial secondary metabolites. Therefore, these enzymes contribute to the chemical diversity of natural products. Prenylation is frequently essential for the pharmacological properties of these metabolites, including their antibiotic and antitumor activities. Recently, the first phenazine PTs, termed EpzP and PpzP, were isolated and biochemically characterized. The two enzymes play a central role in the biosynthesis of endophenazines by catalyzing the regiospecific prenylation of 5,10-dihydrophenazine-1-carboxylic acid (dhPCA) in the secondary metabolism of two different Streptomyces strains. Here we report crystal structures of EpzP in its unliganded state as well as bound to S-thiolodiphosphate (SPP), thus defining the first three-dimensional structures for any phenazine PT. A model of a ternary complex resulted from in silico modeling of dhPCA and site-directed mutagenesis. The structural analysis provides detailed insight into the likely mechanism of phenazine prenylation. The catalytic mechanism suggested by the structure identifies amino acids that are required for catalysis. Inspection of the structures and the model of the ternary complex furthermore allowed us to rationally engineer EpzP variants with up to 14-fold higher catalytic reaction rate compared to the wild-type enzyme. This study therefore provides a solid foundation for additional enzyme modifications that should result in efficient, tailor-made biocatalysts for phenazines production. Structure-based engineering increased the catalytic turnover rate of a novel phenazine prenyltransferase.,Zocher G, Saleh O, Heim JB, Herbst DA, Heide L, Stehle T PLoS One. 2012;7(10):e48427. doi: 10.1371/journal.pone.0048427. Epub 2012 Oct 31. PMID:23119011 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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