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J Bacteriol. 1977 September; 131(3): 784-788

Sodium ion-stimulated alpha-[1-14C]aminoisobutyric acid uptake in alkalophilic Bacillus species.

M Kitada and K Horikoshi

ABSTRACT

Alkalophilic Bacillus no. 8-1 grows well in alkaline media containing 2.5 to 5% NaCl. The uptake of alpha-aminoisobutyric acid (AIB) into the cells is stimulated by the addition of NaCl (Na+) up to a concentration of 0.2 M, but other monovalent cations such as K+, Li+, or NH4+ cannot substitute for Na+. The kinetic studies reveal that, when the Na+ concentration increases from 0.02 to 0.2 M in alkaline medium, the Km for transport decreases, whereas Vmax remains almost constant. Competition studies indicate that glycine, L-alanine, L-serine, and AIB share common carriers for the transport of the compounds into cells. Other alkalophilic bacteria are also found to require Na+ for the uptake of AIB into the cells.

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J Bacteriol. 1977 September; 131(3): 784-788

This article has been cited by other articles:

• Horikoshi, K. (1999). Alkaliphiles: Some Applications of Their Products for Biotechnology. Microbiol. Mol. Biol. Rev. 63: 735-750 [Abstract] [Full Text]