Jing Jing He

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Analysis of the type I modular polyketide synthase (PKS) involved in the biosynthesis of the rare nitroaryl polyketide metabolite aureothin (aur) from Streptomyces thioluteus HKI-227 has revealed only four modules to catalyze the five polyketide chain extensions required. By heterologous expression of the aur PKS cluster, direct evidence was obtained that(More)
Aureothin and neoaureothin (spectinabilin) represent rare nitroaryl-substituted polyketide metabolites from Streptomyces thioluteus and Streptomyces orinoci, respectively, which only differ in the lengths of the polyene backbones. Cloning and sequencing of the 39 kb neoaureothin (nor) biosynthesis gene cluster and its comparison with the aureothin (aur)(More)
The modular-type polyketide synthase (PKS) that is involved in aureothin (aur) biosynthesis represents one of the first examples in which a single PKS module (AurA) is used in an iterative fashion. Here we report on the heterologous expression of an engineered AurAB fusion protein that unequivocally proves the iterative nature of AurA. In addition, point(More)
The antibiotic aureothin is a rare natural nitroaromatic compound produced by Streptomyces thioluteus. By labeling experiments, we demonstrate for the first time that p-nitrobenzoate (PNBA) serves as a polyketide synthase starter unit. Cloning, heterologous expression, and inactivation experiments reveal that this unusual primer is synthesized from(More)
Microbes from the natural environment have long been a major source of therapeutic reagents. During the golden age of antibiotic discovery, the natural products penicillin, vancomycin, and tetracycline were identified from bacterial culture and achieved historic success in mankind’s battle against infectious diseases. Currently, natural product molecules(More)
Aureothin is a shikimate-polyketide hybrid metabolite from Streptomyces thioluteus with a rare nitroaryl moiety, a chiral tetrahydrofuran ring, and an O-methylated pyrone ring. The antimicrobial and antitumor activities of aureothin have caught our interest in modulating its structure as well as its bioactivity profile. In an integrated approach using(More)
Business environments have become increasingly complex and unpredictable. Business is facing turbulence in an environment that includes social, political, technical and economic challenges. IT is developing faster than can be predicted, along with customers' constant changes in demands and living patterns, and businesses must respond to this complex and(More)
The polyketide antibiotic aureothin, produced by Streptomyces thioluteus, is equipped with a rare exomethylene-tetrahydrofuran moiety. Cloning, heterologous expression, and inactivation experiments reveal that AurH, a bifunctional cytochrome P450 monooxygenase, is required and sufficient for the stereoselective synthesis of the furan ring, involving the(More)