NDLI: Ferric Stability Constants of Representative Marine Siderophores: Marinobactins, Aquachelins, and Petrobactin

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Ferric Stability Constants of Representative Marine Siderophores: Marinobactins, Aquachelins, and Petrobactin

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Ferric Stability Constants of Representative Marine Siderophores: Marinobactins, Aquachelins, and Petrobactin

Content Provider	PubMed Central
Author	Zhang, Guangping Amin, Shady A. Küpper, Frithjof C. Holt, Pamela D. Carrano, Carl J. Butler, Alison
Abstract	The coordination of iron(III) to the marine amphiphilic marinobactin and aquachelin siderophores, as well as to petrobactin, the unusual 3,4-dihydroxybenzoyl siderophore is reported. Potentiometric titrations were performed on the apo siderophore to determine the ligand pKa values, as well as the complex formed with addition of one equivalent of Fe(III). The logKML values for Fe(III)-marinobactin-E and Fe(III)-aquachelin-C are 31.80 and 31.4, respectively, consistent with the similar coordination environment in each complex, while logKML for Fe(III)-petrobactin is estimated to be ca. 43. The pKa of the β-hydroxyaspartyl hydroxyl group was determined to be 10.8 by 1H NMR titration. 13C NMR and IR were used to investigate Ga(III) coordination to the marinobactins. The coordination-induced shifts (CIS) in the 13C NMR spectrum of Ga(III)-marinobactin-C compared to apo-marinobactin-C indicates that the hydroxamate groups are coordinated to Ga(III), however, the lack of CISs for the carbons of the β-hydroxyamide group suggests this moiety is not coordinated in the Ga(III) complex. Differences in the IR spectrum of Ga(III)-marinobactin-C and Fe(III)-marinobactin-C in the 1600–1700 cm−1 region also corroborates Fe(III) is coordinated to the β-hydroxyamide moiety, whereas Ga(III) is not coordinated to the β-hydroxyamide group.
Related Links	http://dx.doi.org/10.1021/ic901739m
Ending Page	11473
Page Count	8
Starting Page	11466
File Format	PDF
ISSN	00201669
e-ISSN	1520510X
Journal	Inorganic chemistry
Issue Number	23
Volume Number	48
Language	English
Publisher Date	2009-12-07
Access Restriction	Open
Subject Keyword	Physical and Theoretical Chemistry Inorganic Chemistry Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Inorganic Chemistry

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