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Cryptomonad biliproteins — an evolutionary perspective

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Abstract

Each cryptomonad strain contains only a single spectroscopic type of biliprotein. These biliproteins are isolated as ≈50000 kDa αα'β2 complexes which carry one bilin on the α and three on the β subunit. Six different bilins are present on the cryptomonad biliproteins, two of which (phycocyanobilin and phycoerythrobilin) also occur in cyanobacterial and rhodophytan biliproteins, while four are known only in the cryptomonads. The β subunit is encoded on the chloroplast genome, whereas the α subunits are encoded by a small nuclear multigene family. The β subunits of all cryptomonad biliproteins, regardless of spectroscopic type, have highly conserved amino acid sequences, which show > 80% identity with those of rhodophytan phycoerythrin β subunits. In contrast, cyanobacteria and red algal chloroplasts each contain several spectroscopically distinct biliproteins organized into macromolecular complexes (phycobilisomes). The data on biliproteins, as well as several other lines of evidence, indicate that the cryptomonad biliprotein antenna system is ‘primitive’ and antedates that of the cyanobacteria. It is proposed that the gene encoding the cryptomonad biliprotein β subunit is the ancestral gene of the gene family encoding cyanobacterial and rhodophytan biliprotein α and β subunits.

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Abbreviations

Chl:

chlorophyll

CER:

chloroplast endoplasmic reticulum

SSU rRNA:

small subunit ribosomal RNA

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  1. Department of Molecular and Cell Biology, University of California, 229 Stanley Hall #3206, 94720-3206, Berkeley, CA, USA

    Alexander N. Glazer

  2. Department of Chemistry, University of California, 94720, Berkeley, CA, USA

    Gary J. Wedemayer

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Glazer, A.N., Wedemayer, G.J. Cryptomonad biliproteins — an evolutionary perspective. Photosynth Res 46, 93–105 (1995). https://doi.org/10.1007/BF00020420

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