Islam A. Abdelhakim*, Yushi Futamura, Yukihiro Asami, Hideaki Hanaki, Naoko Kito, Sachiko Masuda, Arisa Shibata, Atsuya Muranaka, Hiroyuki Koshino, Ken Shirasu, Hiroyuki Osada, Jun Ishikawa and Shunji Takahashi*,
{"title":"Expression of Syo_1.56 SARP Regulator Unveils Potent Elasnin Derivatives with Antibacterial Activity","authors":"Islam A. Abdelhakim*, Yushi Futamura, Yukihiro Asami, Hideaki Hanaki, Naoko Kito, Sachiko Masuda, Arisa Shibata, Atsuya Muranaka, Hiroyuki Koshino, Ken Shirasu, Hiroyuki Osada, Jun Ishikawa and Shunji Takahashi*, ","doi":"10.1021/acs.jnatprod.4c00259","DOIUrl":null,"url":null,"abstract":"<p >Actinomycetes are prolific producers of natural products, particularly antibiotics. However, a significant proportion of its biosynthetic gene clusters (BGCs) remain silent under typical laboratory conditions. This limits the effectiveness of conventional isolation methods for the discovery of novel natural products. Genetic interventions targeting the activation of silent gene clusters are necessary to address this challenge. <i>Streptomyces</i> antibiotic regulatory proteins (SARPs) act as cluster-specific activators and can be used to target silent BGCs for the discovery of new antibiotics. In this study, the expression of a previously uncharacterized SARP protein, Syo_1.56, in <i>Streptomyces</i> sp. RK18-A0406 significantly enhanced the production of known antimycins and led to the discovery of 12 elasnins (<b>1</b>–<b>12</b>), 10 of which were novel. The absolute stereochemistry of elasnin A<sub>1</sub> was assigned for the first time to be 6<i>S</i>. Unexpectedly, Syo_1.56 seems to function as a pleiotropic rather than cluster-specific SARP regulator, with the capability of co-regulating two distinct biosynthetic pathways, simultaneously. All isolated elasnins were active against wild-type and methicillin-resistant <i>Staphylococcus aureus</i> with IC<sub>50</sub> values of 0.5–20 μg/mL, some of which (elasnins A<sub>1</sub>, B<sub>2</sub>, and C<sub>1</sub> and proelasnins A<sub>1</sub>, and C<sub>1</sub>) demonstrated moderate to strong antimalarial activities against <i>Plasmodium falciparum</i> 3D7. Elasnins A<sub>1</sub>, B<sub>3</sub>, and C<sub>1</sub> also showed <i>in vitro</i> inhibition of the metallo-β-lactamase responsible for the development of highly antibiotic-resistant bacterial strains.</p>","PeriodicalId":47,"journal":{"name":"Journal of Natural Products ","volume":null,"pages":null},"PeriodicalIF":3.3000,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Natural Products ","FirstCategoryId":"99","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jnatprod.4c00259","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MEDICINAL","Score":null,"Total":0}
引用次数: 0
Abstract
Actinomycetes are prolific producers of natural products, particularly antibiotics. However, a significant proportion of its biosynthetic gene clusters (BGCs) remain silent under typical laboratory conditions. This limits the effectiveness of conventional isolation methods for the discovery of novel natural products. Genetic interventions targeting the activation of silent gene clusters are necessary to address this challenge. Streptomyces antibiotic regulatory proteins (SARPs) act as cluster-specific activators and can be used to target silent BGCs for the discovery of new antibiotics. In this study, the expression of a previously uncharacterized SARP protein, Syo_1.56, in Streptomyces sp. RK18-A0406 significantly enhanced the production of known antimycins and led to the discovery of 12 elasnins (1–12), 10 of which were novel. The absolute stereochemistry of elasnin A1 was assigned for the first time to be 6S. Unexpectedly, Syo_1.56 seems to function as a pleiotropic rather than cluster-specific SARP regulator, with the capability of co-regulating two distinct biosynthetic pathways, simultaneously. All isolated elasnins were active against wild-type and methicillin-resistant Staphylococcus aureus with IC50 values of 0.5–20 μg/mL, some of which (elasnins A1, B2, and C1 and proelasnins A1, and C1) demonstrated moderate to strong antimalarial activities against Plasmodium falciparum 3D7. Elasnins A1, B3, and C1 also showed in vitro inhibition of the metallo-β-lactamase responsible for the development of highly antibiotic-resistant bacterial strains.
期刊介绍:
The Journal of Natural Products invites and publishes papers that make substantial and scholarly contributions to the area of natural products research. Contributions may relate to the chemistry and/or biochemistry of naturally occurring compounds or the biology of living systems from which they are obtained.
Specifically, there may be articles that describe secondary metabolites of microorganisms, including antibiotics and mycotoxins; physiologically active compounds from terrestrial and marine plants and animals; biochemical studies, including biosynthesis and microbiological transformations; fermentation and plant tissue culture; the isolation, structure elucidation, and chemical synthesis of novel compounds from nature; and the pharmacology of compounds of natural origin.
When new compounds are reported, manuscripts describing their biological activity are much preferred.
Specifically, there may be articles that describe secondary metabolites of microorganisms, including antibiotics and mycotoxins; physiologically active compounds from terrestrial and marine plants and animals; biochemical studies, including biosynthesis and microbiological transformations; fermentation and plant tissue culture; the isolation, structure elucidation, and chemical synthesis of novel compounds from nature; and the pharmacology of compounds of natural origin.