Open AccessTwo major potassium uptake systems, KtrI and KtrII, in Enterococcus hirae
Author(s) -
Kawano Miyuki,
Igarashi Kazuei,
Kakinuma Yoshimi
Publication year - 1999
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1999.tb13696.x
Subject(s) - enterococcus hirae , enterococcus , potassium , chemistry , microbiology and biotechnology , biology , organic chemistry , antibiotics
We isolated a mutant, JEMK1, which did not grow at pH 6.0 in medium containing 0.5 mM KCl, derived from a Enterococcus hirae mutant deficient in the KtrII K + uptake system. This mutant showed an impairment in the proton potential‐dependent K + uptake, the activity of the KtrI K + uptake system, and did not grow well in K + ‐poor media in a wide pH range from 6 to 10, suggesting that KtrI and KtrII are the main systems for potassium accumulation of this bacterium.