ISSN:
1572-8773
Keywords:
siderophore-promoted dissolution
;
iron complexes
;
molybdenum complexes
;
metal uptake
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
Abstract The solubilization of Fe(III) hydroxide by the naturally occurring siderophoreN,N′-bis(2,3-dihydroxybenzoyl)-l-lysine has been investigated spectrophotometrically in the presence and the absence of a stoichiometric amount of molybdate in aqueous medium at pH 7. In the absence of molybdate the reaction is 50% complete after 115 min. In contrast, the addition of an equimolar amount of molybdate results in an instantaneous formation of the molybdenum siderophore complex and a significant delay in the formation of the corresponding iron complex: 50% of the iron complex is present after 44 h and equilibrium is only reached after 2 weeks. The results are discussed with regard to metal acquisition by the nitrogen fixing cells ofAzotobacter vinelandii.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00817923
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