Full text

Turn on search term navigation

© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The incidence of Mycobacterium marinum infection is on the rise; however, the existing drug treatment cycle is lengthy and often requires multi-drug combination. Therefore, there is a need to develop new and effective anti-M. marinum drugs. Cochliomycin A, a 14-membered resorcylic acid lactone with an acetonide group at C-5′ and C-6′, exhibits a wide range of antimicrobial, antimalarial, and antifouling activities. To further explore the effect of this structural change at C-5′ and C-6′ on this compound’s activity, we synthesized a series of compounds with a structure similar to that of cochliomycin A, bearing ketal groups at C-5′ and C-6′. The R/S configuration of the diastereoisomer at C-13′ was further determined through an NOE correlation analysis of CH3 or CH2 at the derivative C-13′ position and the H-5′ and H-6′ by means of a 1D NOE experiment. Further comparative 1H NMR analysis of diastereoisomers showed the difference in the chemical shift (δ) value of the diastereoisomers. The synthetic compounds were screened for their anti-microbial activities in vitro. Compounds 1524 and 2835 demonstrated promising activity against M. marinum, with MIC90 values ranging from 70 to 90 μM, closely approaching the MIC90 of isoniazid. The preliminary structure–activity relationships showed that the ketal groups with aromatic rings at C-5′ and C-6′ could enhance the inhibition of M. marinum. Further study demonstrated that compounds 23, 24, 29, and 30 had significant inhibitory effects on M. marinum and addictive effects with isoniazid and rifampicin. Its effective properties make it an important clue for future drug development toward combatting M. marinum resistance.

Details

Title
Semisynthesis, Structure Elucidation and Anti-Mycobacterium marinum Activity of a Series of Marine-Derived 14-Membered Resorcylic Acid Lactones with Interesting Ketal Groups
Author
Jun-Na, Yin 1 ; Cui-Fang, Wang 1 ; Xiu-Li, Zhang 1 ; Ya-Jie Cheng 1 ; Yan-Wei, Wu 1 ; Zhang, Qun 1 ; Chang-Lun, Shao 2   VIAFID ORCID Logo  ; Mei-Yan, Wei 2 ; Yu-Cheng, Gu 3   VIAFID ORCID Logo 

 Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China; [email protected] (J.-N.Y.); [email protected] (C.-F.W.); [email protected] (X.-L.Z.); [email protected] (Y.-J.C.); [email protected] (Y.-W.W.); [email protected] (Q.Z.); [email protected] (C.-L.S.) 
 Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China; [email protected] (J.-N.Y.); [email protected] (C.-F.W.); [email protected] (X.-L.Z.); [email protected] (Y.-J.C.); [email protected] (Y.-W.W.); [email protected] (Q.Z.); [email protected] (C.-L.S.); Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China 
 Syngenta Jealott’s Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK 
First page
431
Publication year
2024
Publication date
2024
Publisher
MDPI AG
e-ISSN
16603397
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3120722750
Copyright
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.