6m9r

Crystal structure of SznF from Streptomyces achromogenes var. streptozoticus NRRL 2697 with a bound N(delta)-hydroxy-N(omega)-methyl-L-arginine intermediate

spinqualitylabelsall models 6m9r, resolution 1.69Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6m9r is a 2 chain structure with sequence from Streptomyces achromogenes subsp. streptozoticus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.69Å Ligands: FE, J9Y Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Small molecules containing the N-nitroso group, such as the bacterial natural product streptozotocin, are prominent carcinogens(1,2) and important cancer chemotherapeutics(3,4). Despite the considerable importance of this functional group to human health, enzymes dedicated to the assembly of the N-nitroso unit have not been identified. Here we show that SznF, a metalloenzyme from the biosynthesis of streptozotocin, catalyses an oxidative rearrangement of the guanidine group of N(omega)-methyl-L-arginine to generate an N-nitrosourea product. Structural characterization and mutagenesis of SznF reveal two separate active sites that promote distinct steps in this transformation using different iron-containing metallocofactors. This biosynthetic reaction, which has little precedent in enzymology or organic synthesis, expands the catalytic capabilities of non-haem-iron-dependent enzymes to include N-N bond formation. We find that biosynthetic gene clusters that encode SznF homologues are widely distributed among bacteria-including environmental organisms, plant symbionts and human pathogens-which suggests an unexpectedly diverse and uncharacterized microbial reservoir of bioactive N-nitroso metabolites. An N-nitrosating metalloenzyme constructs the pharmacophore of streptozotocin.,Ng TL, Rohac R, Mitchell AJ, Boal AK, Balskus EP Nature. 2019 Feb;566(7742):94-99. doi: 10.1038/s41586-019-0894-z. Epub 2019 Feb, 6. PMID:30728519 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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