Methylglyoxal and other carbohydrate metabolites induce lanthanum-sensitive Ca2+ transients and inhibit growth in E. coli. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Archives of Biochemistry and Biophysics Année : 2007

Methylglyoxal and other carbohydrate metabolites induce lanthanum-sensitive Ca2+ transients and inhibit growth in E. coli.

Anthony K Campbell
  • Fonction : Auteur
Riffat Naseem
  • Fonction : Auteur
Stephanie B Matthews
  • Fonction : Auteur
Kenneth T Wann
  • Fonction : Auteur

Résumé

The results here are the first demonstration of a family of carbohydrate fermentation products opening Ca2+ channels in bacteria. Methylglyoxal, acetoin (acetyl methyl carbinol), diacetyl (2,3 butane dione), and butane 2,3 diol induced Ca2+ transients in Escherichia coli, monitored by aequorin, apparently by opening Ca2+ channels. Methylglyoxal was most potent (K(1/2) = 1 mM, 50 mM for butane 2,3 diol). Ca2+ transients depended on external Ca2+ (0.1-10 mM), and were blocked by La3+ (5 mM). The metabolites affected growth, methylglyoxal being most potent, blocking growth completely up to 5 h without killing the cells. But there was no affect on the number of viable cells after 24 h. These results were consistent with carbohydrate products activating a La3+-sensitive Ca2+ channel, rises in cytosolic Ca2+ possibly protecting against certain toxins. They have important implications in bacterial-host cell signalling, and where numbers of different bacteria compete for the same substrates, e.g., the gut in lactose and food intolerance.

Dates et versions

hal-00195208 , version 1 (10-12-2007)

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Citer

Anthony K Campbell, Riffat Naseem, I Barry Holland, Stephanie B Matthews, Kenneth T Wann. Methylglyoxal and other carbohydrate metabolites induce lanthanum-sensitive Ca2+ transients and inhibit growth in E. coli.. Archives of Biochemistry and Biophysics, 2007, 468 (1), pp.107-13. ⟨10.1016/j.abb.2007.09.006⟩. ⟨hal-00195208⟩
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