Abstract:
:The ictA gene, renamed ndhL in this paper, essential to inorganic carbon transport of Synechocystis PCC6803, was expressed in Eschericia coli as a fusion protein with glutathione S-transferase. An antibody was raised against this fusion protein. Western analysis of the thylakoid membrane of wild-type (WT) Synechocystis revealed that a protein with an apparent molecular mass of 6.7 kilodaltons cross-reacted with this antibody. No immunoreactive protein was present in the thylakoid membranes of the Synechocystis mutants, RKb and M9, which have defects in the ictA/ndhL gene, or in the cytoplasmic membranes of the WT and mutant cells. Thus, the protein reacted with the antibody is the ictA gene product (IctA) and is localized in the thylakoid membrane of WT cells. IctA was absent in the thylakoid membranes of the M55 mutant, in which the ndhB gene is inactivated, and was poorly immunostained in the membranes of the mutants (M-ndhC and M-ndhK) constructed by inactivating the ndhC and ndhK genes of WT Synechocystis, respectively. The carbon dioxide uptake activity was nearly zero in M-ndhK and was about 40% of the activity of WT cells in M-ndhC. The RKb, M-ndhC, and M-ndhK mutants were unable to grow or grew very slowly under photoheterotrophic conditions. These results indicated that NADH dehydrogenase is essential to inorganic carbon transport and photoheterotrophic growth of Synechocystis and that IctA is one of the subunits of this enzyme.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Ogawa Tdoi
10.1104/pp.99.4.1604subject
Has Abstractpub_date
1992-08-01 00:00:00pages
1604-8issue
4eissn
0032-0889issn
1532-2548journal_volume
99pub_type
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