Abstract
In plants, the primary enzyme of carbon fixation, RuBisCO (riblose-1,5-bisphosphate carboxylase/oxygenase), is encoded as two subunits, rbcL and rbcS. It is reported that the ML tree based on the amino-acid sequence of RbcL deduced from the nucleotide sequence alignment makes two clusters; R-type (red linage) cluster and G-type (green linage) cluster. G-type RuBisCO coding genes constitute rbcL-rbcS operon, while R-type RuBisCO coding genes constitute rbcL-rbcS-cfxQ operon. It was reported that in Rhodobacter sphaeroides, cfxQ insertional mutant showed to be impaired growth under photoautotrophic conditions.These results predict that cfxQ is necessary for the expression of RuBisCO.
cDNA analysis and complete genome sequence of Cyanidioschyzon merolae 10D indicate that cfxQ is coded both in the plastid genome and in the cell nucleus. In this study, we purpose the function of two cfxQ.
