Abstract
The marine bacterium “Pseudoalteromonas januaria” SUT 11 isolated from a seawater sample produced the rare cell-bound cyclic lipodepsipeptides A/A′, B/B′, and C/C′. The matrix-assisted laser desorption/ionization mass spectra indicated that one bromine atom presented in the peptides B/B′ and C/C′, whereas the component A/A′ contained no bromine atom. The acyldepsipeptides A/A′–C/C′ have an identical amino acid sequence, Thr-Val-Asn-Asn-Leu/allo-Ile, but differed in C-terminal amino acid and acyl moieties. Peptides A–C have Leu as a C-terminal amino acid, whereas peptides A′-C′ have allo-Ile. Acyl moieties in peptides A/A′, B/B′, and C/C′ have been found to consist of 11-(4′-hydroxyphenyl)-undeca-2,4,6,8,10-pentaenic acid, 9-(3′-bromo-4′-hydroxyphenyl)-nona-2,4,6,8-tetraenic acid, and 11-(3′-bromo-4′-hydroxyphenyl)-undeca-2,4,6,8,10-pentaenic acid, respectively. The structure of a main pair of peptides B/B′ with molecular masses 843/845 Da has been determined by means of ultraviolet, infrared, and two-dimensional nuclear magnetic resonance spectroscopy. We have demonstrated that tandem nano-electrospray ionization mass spectrometry is a very efficient way for the fast and sensitive investigation of lipopeptides A/A′ and C/C′ with molecular masses 791 and 869/871 Da, respectively, which have been isolated in small amounts.
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Acknowledgments
We thank Dr. G. Verbitskii (Far Eastern State University, Research and Educational Center of Basic Marine Biota Research) for the determination of the HPLC/ESI-MS data measured on an Agilent 1100 Series LC/MSD mass spectrometer (Hewlett Packard, USA). This work was partially supported by Russian Foundation for Basic Research grants 06-04-48578 and 05-04-48211, grants from Presidium of the Russian Academy of Sciences “Molecular and Cell Biology” 04-1-05-005, and a grant from president of Russian Federation “Leading Scientific School of RF” 6477.1006.4.
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Kalinovskaya, N.I., Dmitrenok, A.S., Kuznetsova, T.A. et al. “Pseudoalteromonas januaria” SUT 11 as the Source of Rare Lipodepsipeptides. Curr Microbiol 56, 199–207 (2008). https://doi.org/10.1007/s00284-007-9023-6
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DOI: https://doi.org/10.1007/s00284-007-9023-6