Abstract
Streptomyces clavuligerus was able to accumulate proline intracellularly throughout a wide range of external proline concentrations. Kinetic analysis of proline uptake indicated that this phenomenon is mediated by two saturable systems. One of them was a high-affinity system ( K m = 11 μM), with low uptake capacity and specific for proline. The second system had lower affinity for proline ( K rmm = 10.2 mM), higher uptake capacity, and was inhibited by several amino acids. Proline was not required as an inducer of the systems, which were neither repressed nor inhibited by ammonium.
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