NDLI: A Designer Bleomycin with Significantly Improved DNA Cleavage Activity

Content Provider	PubMed Central
Author	Huang, Sheng-xiong Feng, Zhiyang Wang, Liyan Galm, Ute Evelyn, Wendt-pienkowski Yang, Dong Tao, Meifeng Coughlin, Jane M. Duan, Yanwen Shen, Ben
Abstract	The bleomycins (BLMs) are used clinically in combination with a number of other agents for the treatment of several types of tumors, and the BLM, etoposide, and cisplatin treatment regimen cures 90–95% of metastatic testicular cancer patients. BLM-induced pneumonitis is the most feared, dose-limiting side effect of BLM in chemotherapy, which can progress into lung fibrosis and affect up to 46% of the total patient population. There have been continued efforts to develop new BLM analogues in the search for anticancer drugs with better clinical efficacy and lower lung toxicity. We have previously cloned and characterized the biosynthetic gene clusters for BLMs from Streptomyces verticillus ATCC15003, tallysomycins from Streptoalloteichus hindustanus E465-94 ATCC31158, and zorbamycin (ZBM) from Streptomyces flavoviridis SB9001. Comparative analysis of the three biosynthetic machineries provided the molecular basis for the formulation of hypotheses to engineer novel analogues. We now report engineered production of three new analogues, 6′-hydroxy-ZBM, BLM Z, and 6′-deoxy-BLM Z and the evaluation of their DNA cleavage activities as a measurement for their potential anticancer activity. Our findings unveiled: (i) the disaccharide moiety plays an important role in the DNA cleavage activity of BLMs and ZBMs, (ii) the ZBM disaccharide significantly enhances the potency of BLM, and (iii) 6′-deoxy-BLM Z represents the most potent BLM analogue known to date. The fact that 6′-deoxy-BLM Z can be produced in reasonable quantities by microbial fermentation should greatly facilitate follow-up mechanistic and preclinical studies to potentially advance this analogue into a clinical drug.
Related Links	http://dx.doi.org/10.1021/ja3056535
Ending Page	13509
Page Count	9
Starting Page	13501
File Format	PDF
ISSN	00027863
e-ISSN	15205126
Journal	Journal of the American Chemical Society
Issue Number	32
Volume Number	134
Language	English
Publisher Date	2012-08-15
Access Restriction	Open
Subject Keyword	Colloid and Surface Chemistry Biochemistry Chemistry(all) Catalysis Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Chemistry Colloid and Surface Chemistry Biochemistry Catalysis

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