Open AccessEvidence for energy‐dependent copper efflux as a mechanism of Cu 2+ resistance in the cyanobacterium Nostoc calcicola
Author(s) -
Verma S.K.,
Singh H.N.
Publication year - 1991
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.1574-6968.1991.tb04612.x
Subject(s) - efflux , cyanobacteria , copper , photosynthesis , nostoc , mutant , biology , botany , biophysics , chemistry , biochemistry , bacteria , genetics , organic chemistry , gene
Wild‐type Nostoc calcicola carried out oxygenic photosynthesis extremely sensitive to copper. A Cu 2+ ‐resistant mutant ( Cu ‐ R 1 ) of the cyanobacterium grew normally at high concentrations of Cu 2+ . Its ability to grow under such conditions was found to be due to mutational acquisition of an energy‐dependent efficient system of Cu 2+ ‐efflux, which rendered Cu 2+ ‐inhibited oxygenic photosynthesis fully reversible.