Impact of a stereocentre inversion in cyclic lipodepsipeptides from the viscosin group: a comparative study of the viscosinamide and pseudodesmin conformation and …

N Geudens, M De Vleeschouwer, K Fehér… - …, 2014 - Wiley Online Library
N Geudens, M De Vleeschouwer, K Fehér, H Rokni‐Zadeh, MGK Ghequire, A Madder…
ChemBioChem, 2014Wiley Online Library
The viscosin group covers a series of cyclic lipodepsipeptides (CLPs) produced by
Pseudomonas bacteria, with a range of biological functions and antimicrobial activities.
Their oligopeptide moieties are composed of both l‐and d‐amino acids. Remarkably, the
Leu5 amino acid—centrally located in the nonapeptide sequence—is the sole residue found
to possess either an l or d configuration, depending on the producing strain. The impact of
this d/l switch on the solution conformation was investigated by NMR‐restrained molecular …
Abstract
The viscosin group covers a series of cyclic lipodepsipeptides (CLPs) produced by Pseudomonas bacteria, with a range of biological functions and antimicrobial activities. Their oligopeptide moieties are composed of both L‐ and D‐amino acids. Remarkably, the Leu5 amino acid—centrally located in the nonapeptide sequence—is the sole residue found to possess either an L or D configuration, depending on the producing strain. The impact of this D/L switch on the solution conformation was investigated by NMR‐restrained molecular modelling of the epimers pseudodesmin A and viscosinamide A. Although the backbone fold remained unaffected, the D/L switch adjusted the segregation between hydrophobic and hydrophilic residues, and thus the amphipathicity. It also influenced the self‐assembly capacity in organic solvents. Additionally, several new minor variants of viscosinamide A from Pseudomonas fluorescens DR54 were identified, and an NMR assay is proposed to assess the presence of either an L‐ or D‐Leu5.
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