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Photosynthesis Research

, Volume 23, Issue 2, pp 181–193 | Cite as

Subunit organization of PSI particles from brown algae and diatoms: polypeptide and pigment analysis

  • Claire Berkaloff
  • Lise Caron
  • Bernard Rousseau
Regular Paper

Abstract

P700 enriched fractions were isolated from two brown algae and one diatom using sucrose density centrifugation after digitinin solubilization. They had a Chl a/P700 ratio of about 250 to 375 according to the species, they were enriched in long-wavelength absorbing Chl a and exhibited a fluorescence emission maximum at 77 K near 720 nm. They all presented a major polypeptide component at 66±2 kDa, but their polypeptide composition was rather complex and somewhat different from one species to another. Further solubilization with dodecylmaltoside of those ‘native’ PSI particles allowed the separation of two or three fractions. The lightest, xanthophyll-rich, fraction was identified to be a light-harvesting complex. It contained no P700 and had a major polypeptide of molecular weight near 20 kDa (at the same molecular weight than the respective LH ‘native’ fraction of each species) and exhibited a 77 K peak fluorescence emission at 685 nm. The other fractions were enriched in P700 and almost entirely depleted in xanthophylls. When two of them are present, they both exhibited a major polypeptide at 66±2 kDa and were totally devoid of the LH polypeptide, but the two fractions widely differed one from another in the abundance and molecular weight of the other polypeptide components. The most purified of these two fractions presented a composition similar to PSI core complex from green plants.

Key words

brown algae diatoms dodecylmaltoside HPLC pigment protein complexes photosystem I 

Abbreviations

LH

light-harvesting

LHCII

light-harvesting complex II of green plants

P700

reaction center chlorophyll of PSI

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Claire Berkaloff
    • 1
  • Lise Caron
    • 2
  • Bernard Rousseau
    • 1
  1. 1.Laboratoire des Biomembranes et surfaces cellulaires végétalesUA CNRS 311, Ecole Normale SupérieureParis Cédex 05France
  2. 2.Laboratoire AragoUA CNRS 117Banyuls sur merFrance

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