Antonie van Leeuwenhoek

, Volume 54, Issue 4, pp 331–343

Movements of protons coupled to glucose transport in yeasts. A comparative study among 248 yeast strains

  • Maria C. Loureiro-Dias
General Papers

DOI: 10.1007/BF00393524

Cite this article as:
Loureiro-Dias, M.C. Antonie van Leeuwenhoek (1988) 54: 331. doi:10.1007/BF00393524


In 248 strains representing 205 yeast species, changes in pH coupled to glucose addition were followed in unbuffered cell suspensions. Alkalinization of the external medium elicited by glucose, indicating a H+-glucose symport was observed in 34% of the strains, most of them belonging to the genera Rhodotorula, Hansenula and Candida. H+ uptake coupled to glucose transport was observed only after exhaustion of glucose in growth media. This observation was taken as an indication that, in general, the synthesis of H+-glucose symport is under the control of catabolite repression. Subsequently to the addition of glucose, in most yeasts (82%) acidification was observed. This ability is probably related to the creation of a proton-gradient across the plasma membrane and is generally distributed among yeasts.

Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • Maria C. Loureiro-Dias
    • 1
  1. 1.Laboratory of MicrobiologyGulbenkian Institute of ScienceOeirasPortugal