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  • Title: Role of L-threonine deaminase and L-threonine 3-dehydrogenase in the utilization of L-threonine by Pseudomonas aeruginosa.
    Author: Lam VM, Chan IP, Yeung YG.
    Journal: J Gen Microbiol; 1980 Apr; 117(2):539-42. PubMed ID: 6775044.
    Abstract:
    Mutants of Pseudomonas aeruginosa PAC1 which could grow on L-threonine were isolated. These mutants, like the parent strain, synthesized a biosynthetic threonine deaminase, but its apparent Km value for threonine was higher than that of the enzyme from strain PAC1. These mutants also synthesized an inducible NAD-dependent threonine dehydrogenase, which was not present in the parent strain. No threonine aldolase activity could be detected. The results suggest that the threonine deaminase with lowered affinity for L-threonine, together with L-threonine dehydrogenase, enabled these mutants to utilize L-threonine as the sole source of carbon for growth.
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