Nutrition and Metabolism of Marine Bacteria XV. Relation of Na+-Activated Transport to the Na+ Requirement of a Marine Pseudomonad for Growth1

AUTOR(ES)
RESUMO

Drapeau, Gabriel R., (McGill University, Montreal, Quebec, Canada), Tibor I. Matula, and Robert A. MacLeod. Nutrition and metabolism of marine bacteria. XV. Relation of Na+-activated transport to the Na+ requirement of a marine pseudomonad for growth. J. Bacteriol. 92:63–71. 1966.—A marine pseudomonad was found to require 50 to 100 mm Na+ for maximal rate of oxidation of d-galactose and for the transport of d-fucose-H3 into the cells. The same organism required 150 to 200 mm Na+ for the oxidation of l-alanine and for the transport of φ-aminoisobutyric acid-C14 (AIB-C14) into the cells. Competition studies indicated that d-galactose and d-fucose on the one hand and l-alanine and AIB on the other shared common carriers for transporting the compounds into the cells. This parallelism in Na+ response for oxidation and transport extended to growth when l-alanine was the sole carbon source in the medium. When d-galactose was the sole carbon source, an amount of Na+ equal to that with l-alanine was needed. KCN and dinitrophenol but not ouabain inhibited the uptake of AIB-C14 by the cells. K+ in addition to Na+ was required for transport, and both Mg++ and either Cl− or Br− were stimulatory. Photobacterium fischeri was also found to require Na+ specifically for the uptake of AIB-C14 by the cells.

ACESSO AO ARTIGO

Documentos Relacionados