Role of molybdate and other transition metals in the accumulation of protochelin by Azotobacter vinelandii

Article Abstract:

Molybdate appears to inhibit ferric reductase in Azotoacter vinelandii. This may explain why protochelin is produced to the exclusion of other catecholate siderophores at high concentrations of molybdate.

Microbial metabolism, Molybdenum

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Formation of poly(hydroxybutyrate-co-hydroxyvalerate) by Azotobacter vinelandii UWD

Article Abstract:

The polyhydoxyalkanoate (PHA)-producing ability of Azotobacter vinelandii strain UWD was evaluated. The results showed that this bacterium could form PHA copolymers containing beta-hydroxybutyrate and beta-hydroxyvalerate in response to growth on glucose as primary carbon source and valerate as a precursor. The proportions of the co-polymers could be altered in response to changes in carbon source:precursor combinations. Computations based on cost of substrates per kilogram of PHA produced showed that strain UWD is a promising candidate for the production of bioplastics.

Evaluation, Plastics, Biopolymers, Microbial biotechnology, Industrial microorganisms

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The catecholate siderophores of Azotobacter vinelandii: their affinity for iron and role in oxygen stress management

Article Abstract:

Research was conducted to examine the role of catecholate siderophores of Azotobacter vinelandii such as tricatecholate protochelin, dicatecholate azotochelin and monocatecholate aminochelin in oxygen stress management. Tests showed that A. vinelandii experiences oxidative stress under iron-limited conditions. The siderophores have been found to provide chemical protection from oxidative damages.

Gram-negative bacteria, Oxidation, Physiological, Physiological oxidation

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