Current Genetics

, Volume 16, Issue 3, pp 203–209

The genes of both subunits of ribulose-1,5-bisphosphate carboxylase constitute an operon on the plastome of a red alga

  • Klaus Valentin
  • Klaus Zetsche
Original Articles

DOI: 10.1007/BF00391478

Cite this article as:
Valentin, K. & Zetsche, K. Curr Genet (1989) 16: 203. doi:10.1007/BF00391478


Plastid (pt) DNA from the red alga Porphyridium aerugineum was purified by CsCI gradient centrifugation. An EcoRI library of the ptDNA was screened with a gene probe specific for the gene encoding the large subunit (LSU) of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco EC from spinach. A 5.8 kb EcoRI clone containing the LSU gene (rbcL) was isolated and the DNA sequence of the Porphyridium rbcL gene and its flanking regions was determined. An open reading frame was found 130 by downstream from the rbcL gene that shows homology to genes coding for the small subunit of Rubisco (rbcS) from higher plants and cyanobacteria. Both genes (rbcL + rbcS) are cotranscribed. Comparison of rbcL and rbcS sequences from Porphyridium, higher plants and cyanobacteria seems to reveal a remarkable evolutionary distance between the plastids of the red algae (rhodoplasts), chloroplasts and cyanobacteria.

Key words

Red algaeptDNARibulose-1,5-bisphosphate carboxylasePlastid evolution

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Klaus Valentin
    • 1
  • Klaus Zetsche
    • 1
  1. 1.Institut für PflanzenphysiologieJustus-Liebig-Universität GiessenGiessenGermany