The transport and catabolism of L-proline by cowpea Rhizobium NGR 234
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Cowpea Rhizobium NGR234 grows with a mean generation time of 3.5 h on L-proline; intracellular catabolism via proline oxidase and pyrroline 5-carboxylate dehydrogenase is induced by proline. In contrast, cells have some capacity to take up proline whatever the growth medium. Uptake of proline is active and transmembrane gradients of approximately 290-fold can be generated. The proline transporter(s) appear to carry a range of amino acids and intracellular [14C]proline can be exchanged with extracellular valine or histidine or isoleucine but not glutamate. Snake bean bacteroids are unable to transport or catabolize L-proline, consistent with the lack of detectable proline in snakebean nodule cytosol. In this symbiosis at least, proline is not an important carbon source for bacteroids.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Biological and Environmental Sciences|
|Copyright:||© 1991 Published by Elsevier B.V.|
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