Elsevier

Gene

Volume 97, Issue 1, 1991, Pages 55-62
Gene

Sequence and expression of genes encoding the large and small subunits of ribulose 1,5-bisphosphate carboxylase/oxygenase from Chromatium vinosum

https://doi.org/10.1016/0378-1119(91)90009-ZGet rights and content

Abstract

A DNA fragment bearing genes for the large (rbcL) and small (rbcS) subunits of ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) was cloned from the photosynthetic purple sulfur bacterium Chromatium vinosum. Enzymatically fully active RuBisCO was synthesized in Escherichia coli cells when the cloned DNA was placed downstream of tac promoter. Nucleotide (nt) sequences of rbcL-rbcS were more homologous to cyanobacterial counterparts than to those from Alcaligenes eutrophus or higher plants. However, the amino acid (aa) sequence in a domain responsible for CO2 activation in the C. vinosum rbcL product resembled the corresponding aa sequence in higher plant RuBisCOs, but not in the cyanobacterial enzymes. Chemically determined aa sequences at the N terminals of both subunits of RuBisCO purified from C. vinosum were not identical to those deduced from the nt sequences, although they were completely the same as aa sequences deduced from rbcA-rbcB, another locus encoding RuBisCO in C. vinosum. Therefore, the rbcL-rbcS locus seems to be barely expressed under a standard condition for photoautotrophic growth. The homology of the nt sequences between rbcL-and rbcA was 82%, and that between rbcS and rbcB was 63 %, whereas the codon usages of these genes were basically identical. The rbcL-rbcS and rbcA-rbcB loci therefore must have evolved from a common ancestral set of genes after duplication, instead of lateral gene transfer.

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