Characterization of Cu- and Zn-containing superoxide dismutase of Rhodobacter sphaeroides.
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 O2 under the illuminated conditions at 10 W/m2.
Kho
Dhong Hyo
DH
Department of Life Science, Sogang University, Seoul 121-742, Republic of Korea.
Yoo
Sang-Bae
SB
Kim
Ju-Sim
JS
Kim
Eui-Jin
EJ
Lee
Jeong K
JK
D003600:Cytosol / Q000201:enzymology; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism; D016296:Mutagenesis; D011499:Protein Processing, Post-Translational; D011994:Recombinant Proteins / Q000378:metabolism; D012242:Rhodobacter sphaeroides / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D017384:Sequence Deletion; D013482:Superoxide Dismutase / Q000235:genetics* / Q000378:metabolism*
D007527:Isoenzymes; D011994:Recombinant Proteins; D013482:Superoxide Dismutase