MECHANISM OF ARABINOSE TRANSPORT IN TETRAHYMENA PYRIFORMIS

Abstract

Cirillo, Vincent P. (Seton Hall College of Medicine and Dentistry, Jersey City, N.J.). Mechanism of arabinose transport in Tetrahymena pyriformis. J. Bacteriol. 84:754–758. 1962.—The mechanism of sugar transport was studied in Tetrahymena pyriformis, using the nonmetabolizable sugar, l-arabinose. Arabinose transport does not result in accumulation against a concentration difference but shows a high Q₁₀ and is competitively inhibited by glucose. The addition of glucose to arabinose-equilibrated cells results in arabinose efflux against a concentration difference. These results are discussed in terms of carrier-mediated transport.