Summary
In iron-deficient conditions,Pseudomonas aeruginosa ATCC 15692 synthesizes two major siderophores, pyoverdins Pa and pyoverdin Pa B. Two other compounds, pyoverdin Pa A (occurring from hydrolysis of pyoverdin Pa during the culture) and pyoverdin Pa C (occurring artifactually during the purification procedure) were also isolated. All these compounds possess the same partly cyclic peptide chain
wherel-Orn(δOH · HCO) isN δ-formyl,N δ-hydroxy-l-ornithine. The chain is bound to a chromophore derived from 2,3-diamino-6,7-dihydroxyquinoline and having the (S) configuration. The four pyoverdins differ only in the acyl substituent bound to the nitrogen atom bound to carbon C3 of the chromophore. This is succinamide (pyoverdin Pa), succinic acid (pyoverdin Pa A), methyl succinate (pyoverdin Pa C) and 2-oxoglutaric acid (pyoverdin Pa B). The complete1H- and13CNMR assignments, using two-dimensional total correlation NMR spectroscopy (TOCSY) and rotating-frame Overhauser enhancement spectroscopy (ROESY) procedures, as well as1H-13C correlations, are reported. The complete sequence of the peptide using CHα-NH correlations was achieved by NMR and confirmed the partly cyclic structure earlier reported using fast-atom-bombardment mass spectrometry (FAB-MS) on the siderophores and their dansylated fragments [Briskot G, Taraz K, Budzikiewicz H (1989)Liebigs Ann Chem: 375–384]. The use of these NMR procedures appears to be a tool of choice and a complementary approach to FAB-MS in the structure determination of some complex pyoverdins.
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Abbreviations
- Ser:
-
serine
- Arg:
-
arginine
- Thr:
-
ethreonine
- Lys:
-
lysine
- OHOrn:
-
N δ-hydroxyornithine
- Chr:
-
chromophore
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Demange, P., Wendenbaum, S., Linget, C. et al. Bacterial siderophores : structure and NMR assignment of pyoverdins Pa, siderophores ofPseudomonas aeruginosa ATCC 15692. Biol Metals 3, 155–170 (1990). https://doi.org/10.1007/BF01140574
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DOI: https://doi.org/10.1007/BF01140574