A Family of Pyrazinone Natural Products from a Conserved Nonribosomal Peptide Synthetase in Staphylococcus aureus  Michael Zimmermann, Michael A. Fischbach 

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A Family of Pyrazinone Natural Products from a Conserved Nonribosomal Peptide Synthetase in Staphylococcus aureus  Michael Zimmermann, Michael A. Fischbach  Chemistry & Biology  Volume 17, Issue 9, Pages 925-930 (September 2010) DOI: 10.1016/j.chembiol.2010.08.006 Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 1 Schematic of the S. aureus Pyrazinone (pzn) Gene Cluster and Proposed Biosynthetic Pathway for the Staphylococcus Pyrazinones A: adenylation domain; C: condensation domain; T: thiolation domain; R: reductase domain. Chemistry & Biology 2010 17, 925-930DOI: (10.1016/j.chembiol.2010.08.006) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 2 Strategy for the Allelic Replacement of pznA in S. aureus RN4220 After integration of the plasmid by the first genomic crossover event, the second crossover can either lead to the desired knockout strain or reversion to the wild-type strain. Successful allelic replacement is demonstrated by Southern blot. Wt corresponds to the wild-type strain of S. aureus RN4220. Ko#1 and #2 correspond to independently generated and selected knockout strains for the NRPS gene pznA. Scheme adapted from Horsburgh et al. (1999). Chemistry & Biology 2010 17, 925-930DOI: (10.1016/j.chembiol.2010.08.006) Copyright © 2010 Elsevier Ltd Terms and Conditions

Figure 3 Comparison of Pyrazinone Production across Staphylococcus Species RP-HPLC analysis (325 nm) of methanol extracts of culture supernatants after 48 hr are shown. RN42220ko corresponds to the ΔpznA S. aureus strain. Both S. epidermidis strains harbor the pzn gene cluster, whereas S. saprophyticus S-41 does not. Inset A: Time course for the production of phevalin by S. aureus RN4220wt. Inset B: Ultraviolet/visible absorption spectrum of phevalin. Chemistry & Biology 2010 17, 925-930DOI: (10.1016/j.chembiol.2010.08.006) Copyright © 2010 Elsevier Ltd Terms and Conditions