A novel polycyclic quinazoline and three quinolines alkaloids from marine-derived fungus < em > trichoderma longibrachiatum < /em > QD01 with anti-bacterial and anti-quorum sensing activities

Nat Prod Res. 2024 Apr 13:1-10. doi: 10.1080/14786419.2024.2341277. Online ahead of print.ABSTRACTA novel polycyclic quinazoline alkaloid (1) along with one new natural quinoline alkaloid (2) and two known quinoline alkaloids (3,4) were isolated from the marine-derived fungus Trichoderma longibrachiatum QD01. Structural determinations of those isolates were established by comprehensive spectroscopic analyses and literature comparison. Single-crystal X-ray diffraction analysis of novel compound verified its structure and stereochemistry, representing the first characterised crystal structure of a trimeric-type of tetrahydroquinazoline. Compound 4 exhibited potential antibacterial and anti-quorum sensing activity against C. violaceum and C. violaceum CV026. The sub-MIC of 4 observably decreased the violacein production in C. violaceum CV026 by 55% on 15 μg/mL. Furthermore, molecular docking results revealed that 4 has stronger binding interactions with CviR receptor than ligand C6-HSL with lower binding energy of -8.68 kcal/mol. Hydrogen bond and π-π interactions formed by Trp84, Tyr88, Trp111, and Phe126 were predicted to play an important role in the inhibition against C. violaceum CV026.PMID:38613421 | DOI:10.1080/14786419.2024.2341277
Source: Natural Product Research - Category: Biochemistry Authors: Source Type: research
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