Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 9, Pages 4026-4033Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b13049
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Funding
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2016-03778]
- Alfred P. Sloan Foundation [FG-20166503]
- Canadian Institutes of Health Research [FDN-148381, 201312MSH-322191-209186]
- Michael Smith Foundation for Health Research [16776]
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Nitric oxide (NO) has wide-ranging roles in biology, but less is known about its role in building chemical diversity. Here we report a new route to NO from the biosynthetic pathway to the N-nitroso compound streptozocin. We show that the N-nitroso group of streptozocin comes from the biosynthetic reassembly of L-arginine, with the guanidino nitrogens forming a nitrogen-nitrogen bond. To understand this biosynthetic process, we identify the biosynthetic gene cluster of streptozocin and demonstrate that free L-arginine is N-methylated by StzE to give N-omega-monomethyl-L-arginine. We show that this product is then oxidized by StzF, a nonheme iron-dependent enzyme unrelated to known nitric oxide synthases, generating a urea compound and NO. Our work implies that formation and capture of NO is the likely route to N-nitroso formation in vivo. Altogether, our work unveils a new enzyme pair for the production of NO from L-arginine and sets the stage for understanding biosynthetic routes to N-nitroso natural products.
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