Iron-regulated excretion of alpha-keto acids by Salmonella typhimurium

被引:28
作者
Reissbrodt, R
Kingsley, R
Rabsch, W
Beer, W
Roberts, M
Williams, PH
机构
[1] UNIV LEICESTER,DEPT IMMUNOL & MICROBIOL,LEICESTER LE1 9HN,LEICS,ENGLAND
[2] ROBERT KOCH INST,WERNIGERODE BRANCH,D-38855 WERNIGERODE,GERMANY
[3] FED INST HLTH PROTECT CONSUMERS & VET MED,WERNIGERODE BRANCH,D-38855 WERNIGERODE,GERMANY
[4] UNIV GLASGOW,SCH VET,DEPT VET PATHOL,GLASGOW G61 1QH,LANARK,SCOTLAND
关键词
D O I
10.1128/jb.179.14.4538-4544.1997
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Excretion of alpha-keto acids by clinical isolates and laboratory strains of Salmonella typhimurium was was determined by high-performance liquid chromatography analysis of culture supernatants. The levels of excretion increased markedly with increasing iron stress imposed by the presence of alpha,alpha'-dipyridyl or conalbumin in the medium. The major product was pyruvic acid, but significant concentrations of alpha-ketoglutaric acid, alpha-ketoisovaleric acid, and alpha-ketoisocaproic acid were also observed. Maximal excretion occurred at iron stress levels that initially inhibited bacterial growth; the concentration of alpha,alpha'-dipyridyl at which this was observed differed between strains depending on their ability to secrete and utilize siderophores, suggesting that the intracellular iron status was important in determining alpha-keto acid excretion. However, prolonged incubation of the siderophore-defrcient S. typhimurium strain enb-7 under conditions of high iron stress resulted in significant delayed bacterial growth, promoted by tonB-dependent uptake of iron complexed with the high accumulated levels of pyruvic acid and other alpha-keto acids. Strain RB181. a fur derivative of enb-7, excreted massive amounts of a-keto acids into the culture medium even in the absence of any iron chelators (the concentration of pyruvic acid, for example, was >25 mM). Moreover, RB181 was able to grow and excretes alpha-keto acids in the presence of alpha,alpha'-dipyridyl at concentrations threefold greater than that which inhibited the growth of enb-7.
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页码:4538 / 4544
页数:7
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