Plant Molecular Biology

, Volume 40, Issue 3, pp 507–521

Phycoerythrins of the oxyphotobacterium Prochlorococcus marinus are associated to the thylakoid membrane and are encoded by a single large gene cluster

  • Wolfgang R. Hess
  • Claudia Steglich
  • Christiane Lichtlé
  • Frédéric Partensky
Article

DOI: 10.1023/A:1006252013008

Cite this article as:
Hess, W.R., Steglich, C., Lichtlé, C. et al. Plant Mol Biol (1999) 40: 507. doi:10.1023/A:1006252013008

Abstract

An intrinsic divinyl-chlorophyll a/b antenna and a particular form of phycobiliprotein, phycoerythrin (PE) III, coexist in the marine oxyphotobacterium Prochlorococcus marinus CCMP 1375. The genomic region including the cpeB/A operon of P. marinus was analysed. It encompasses 10 153 nucleotides that encode three structural phycobiliproteins and at least three (possibly five) different polypeptides analogous to cyanobacterial or red algal proteins involved either in the linkage of subunits or the synthesis and attachment of chromophoric groups. This gene cluster is part of the chromosome and is located within a distance of less than 110 kb from a previously characterized region containing the genes aspA-psbA-aroC. Whereas the Prochlorococcus phycobiliproteins are characterized by distinct deletions and amino acid replacements with regard to analogous proteins from other organisms, the gene arrangement resembles the organization of phycobiliprotein genes in some other cyanobacteria, in particular marine Synechococcus strains. The expression of two of the Prochlorococcus polypeptides as recombinant proteins in Escherichia coli allowed the production of individual homologous antisera to the Prochlorococcus α and β PE subunits. Experiments using these sera show that the Prochlorococcus PEs are specifically associated to the thylakoid membrane and that the protein level does not significantly vary as a function of light irradiance or growth phase.

cyanobacteria immunogold labelling light-harvesting complexes photosynthesis phycobilins phytoplankton 

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Wolfgang R. Hess
    • 1
  • Claudia Steglich
    • 2
  • Christiane Lichtlé
    • 2
  • Frédéric Partensky
    • 3
  1. 1.Department of BiologyHumboldt-UniversityBerlinGermany
  2. 2.Laboratoire de Photorégulation et Dynamique des Membranes VégétalesEcole Normale Supérieure, CNRS URA 1810Paris Cedex 05France
  3. 3.Station Biologique, CNRSINSU et Université Pierre et Marie CurieRoscoff CedexFrance

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