New variochelins from soil-isolated Variovorax sp. H002.
Beilstein J Org Chem
; 20: 692-700, 2024.
Article
in En
| MEDLINE
| ID: mdl-38590537
ABSTRACT
The soil bacterial genus Variovorax produce distinct photoreactive siderophores that may play a crucial role in the iron cycle within the rhizosphere. This study focused on exploring the natural products of the soil-isolated Variovorax sp. H002, leading to the isolation of variochelins A-E (1-5), a series of lipohexapeptide siderophores. NMR and MS/MS analyses revealed that these siderophores share a common core structure - a linear hexapeptide with ß-hydroxyaspartate and hydroxamate functional groups, serving in iron-binding coordination. Three new variochelins C-E (3-5) were characterized by varied fatty acyl groups at their N-termini; notably, 4 and 5 represent the first variochelins with N-terminal unsaturated fatty acyl groups. Furthermore, the variochelin biosynthetic gene cluster was identified through draft genome sequencing and gene knockout experiments. Compounds 1-5 exhibited antimicrobial activities against Gram-negative bacteria, including several soil-isolated plant pathogens.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Beilstein J Org Chem
Year:
2024
Type:
Article
Affiliation country:
Japan