Open AccessCharacterization of Cu‐ and Zn‐containing superoxide dismutase of Rhodobacter sphaeroides
Author(s) -
Kho Dhong Hyo,
Yoo SangBae,
Kim JuSim,
Kim EuiJin,
Lee Jeong K.
Publication year - 2004
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.1574-6968.2004.tb09542.x
Subject(s) - periplasmic space , rhodobacter sphaeroides , superoxide dismutase , chemistry , superoxide , enzyme , dismutase , biochemistry , cytoplasm , microbiology and biotechnology , biology , escherichia coli , gene , photosynthesis
Abstract Rhodobacter sphaeroides has a cuprozinc‐containing superoxide dismutase (CuZnSOD) in its periplasm in addition to the cytoplasmic SOD that appears to contain iron (FeSOD). The FeSOD is constitutively expressed under the growth conditions examined, whereas the CuZnSOD is detected only when the light‐harvesting complexes are found. The CuZnSOD expression is regulated post‐transcriptionally, and the enzyme appears to protect the photoheterotrophic cells from periplasmic superoxide that may be generated by exposure of the cells to low O 2 under the illuminated conditions at 10 W/m 2 .