Proline is biosynthesized from arginine in Staphylococcus aureus.
Staphylococcus aureus NCTC 8325 exhibited a long lag phase (11 h) when inoculated into defined medium lacking proline, that could be shortened by increasing the concentration of arginine in the medium, or by supplying ornithine. Radioactivity from L-[14C]arginine, but not L-[14C]glutamate was incorporated into a spot with the chromatographic mobility of [14C]proline in the pool metabolites fraction. Selection for transposon Tn917-lacZ mutants impaired in arginine catabolism yielded four proline auxotrophs. Enzyme assays and precursor feeding experiments suggested that the major pathway for proline biosynthesis in S. aureus was from arginine via ornithine and delta'-pyrroline 5-carboxylate, rather than from glutamate. Strain 8325 Pro+, a proline prototrophic variant obtained by cultivation of 8325 in the absence of proline, accumulated L-[14C]arginine from the medium at about eight times the rate of strain 8325, suggesting its response to proline starvation was to increase arginine uptake.
Townsend
David E
DE
Microbiology Group, Department of Biological Sciences, Illinois State University, Normal, Illinois 61790-4120, USA.
Kaenjak
Anisa
A
Microbiology Group, Department of Biological Sciences, Illinois State University, Normal, Illinois 61790-4120, USA.
Jayaswal
Radheshyam K
RK
Microbiology Group, Department of Biological Sciences, Illinois State University, Normal, Illinois 61790-4120, USA.
Wilkinson
Brian J
BJ
Microbiology Group, Department of Biological Sciences, Illinois State University, Normal, Illinois 61790-4120, USA.
D001120:Arginine / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism; D002244:Carbon / Q000378:metabolism; D004251:DNA Transposable Elements; D018698:Glutamic Acid / Q000378:metabolism; D009952:Ornithine / Q000378:metabolism; D011392:Proline / Q000096:biosynthesis*; D011758:Pyrroles / Q000378:metabolism; D013211:Staphylococcus aureus / Q000235:genetics / Q000378:metabolism*
D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D011758:Pyrroles; C015485:delta-1-pyrroline-5-carboxylate; D018698:Glutamic Acid; D002244:Carbon; D001120:Arginine; D011392:Proline; D009952:Ornithine