Abstract：
:Bean-deleterious Pseudomonas A214 produced the extracellular yellow-green, fluorescent siderophore [microbial iron(III) transport agent] pseudobactin A214 under iron-limiting conditions. Pseudobactin A214 has a molecular formula of C46H64N13O22 and a molecular mass of 1151 g/mol. Pseudobactin A214 contained an N-blocked linear octapeptide with the amino acid sequence Ser-Ala-Gly-Ser-Ala-threo-beta-OH-Asp-L-allo-Thr-N delta-OH-Orn with a yellow-green, fluorescent quinoline derivative attached via an amide bond to the amino terminus. A succinamide group was linked to carbon 3 of the quinoline derivative. Sequencing was accomplished by two-dimensional NMR spectroscopy and by Edman degradation of smaller peptides obtained from partial acid hydrolysis. Since pseudobactin A214 was not affected by nonspecific proteolytic enzymes, it might contain D-amino acids. The three bidentate iron-(III)-chelating groups consisted of a 1,2-dihydroxy aromatic group in the quinoline chromophore, an alpha-hydroxy acid group present as beta-hydroxyaspartic acid, and a hydroxamate group derived from N delta-acetyl-N delta-hydroxyornithine. The chemical structure of pseudobactin A214 is remarkably similar to those of pseudobactin and pseudobactin 7SR1, the siderophores of plant growth promoting and plant-deleterious Pseudomonas B10 and Pseudomonas 7SR1, respectively.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Buyer JS,Wright JM,Leong Jdoi
10.1021/bi00367a022subject
Has Abstractpub_date
1986-09-23 00:00:00pages
5492-9issue
19eissn
0006-2960issn
1520-4995journal_volume
25pub_type
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