Quinolactacin Biosynthesis Involves Non-Ribosomal-Peptide-Synthetase-Catalyzed Dieckmann Condensation to Form the Quinolone-γ-lactam Hybrid.
Quinolactacin Biosynthesis Involves Non-Ribosomal-Peptide-Synthetase-Catalyzed Dieckmann Condensation to Form the Quinolone-γ-lactam Hybrid.
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DOI:
10.1002/anie.202005770
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发表时间:
2020-10-19
影响因子:
16.6
通讯作者:
Gao, Xue
中科院分区:
文献类型:
--
作者:
Zhao, Fanglong;Liu, Zhiwen;Yang, Shuyuan;Ding, Ning;Gao, Xue
关键词:
Quinolactacins are novel fungal alkaloids that feature a quinolone-γ-lactam hybrid, which is a potential pharmacophore for the treatment of cancer and Alzheimer’s disease. Here, we report the identification of the quinolactacin A2 biosynthetic gene cluster and elucidate the enzymatic basis for the formation of the quinolone-γ-lactam structure. We reveal an unusual β-keto acid (N-methyl-2-aminobenzoylacetate) precursor that is derived from the primary metabolite l-kynurenine via methylation, oxidative decarboxylation, and amide hydrolysis reactions. In vitro assays reveal two single-module NRPSs that incorporate the β-keto acid and l-isoleucine, followed by Dieckmann condensation, to form the quinolone-γ-lactam. Notably, the bioconversion from l-kynurenine to the β-keto acid is a unique strategy employed by Nature to decouple R* domain-containing NRPS from PKS machinery, which expands the paradigm for the biosynthesis of quinolone-γ-lactam natural products via Dieckmann condensation. We reveal that the novel pharmacophore quinolone-γ-lactam hybrid is constructed from the NRPSs catalyzed condensation of an unnatural and unstable β-keto acid with isoleucine. Most intriguingly, this β-keto acid was biosynthesized from tryptophan via extensive modifications catalyzed by a dedicated set of enzymes, which represents a new strategy used by Nature to generate structural complexities.
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影响因子:
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作者:
通讯作者:
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影响因子:
3.3
作者:
Kim, WG;Song, NK;Yoo, ID
通讯作者:
Yoo, ID
影响因子:
11.5
作者:
Berning, SE
通讯作者:
Berning, SE
影响因子:
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作者:
Bera, Asim K.;Atanasova, Vesna;Robinson, Howard;Eisenstein, Edward;Coleman, James P.;Pesci, Everett C.;Parsons, James F.
通讯作者:
Parsons, James F.
DOI:
10.1007/978-1-4939-3375-4_5
发表时间:
2016-01-01
期刊:
NONRIBOSOMAL PEPTIDE AND POLYKETIDE BIOSYNTHESIS: METHODS AND PROTOCOLS
影响因子:
--
作者:
Maruyama, Chitose;Niikura, Haruka;Hamano, Yoshimitsu
通讯作者:
Hamano, Yoshimitsu