Archives of Microbiology

, Volume 140, Issue 2–3, pp 202–205 | Cite as

Crystallization and preliminary x-ray diffraction data of the cryptomonad biliprotein phycocyanin-645 from a Chroomonas spec.

  • Walter Morisset
  • Werner Wehrmeyer
  • Tilman Schirmer
  • Wolfram Bode
Original Papers


The water-soluble antenna chromoprotein phycocyanin-645 from a Chroomonas species (Cryptophyceae) has been crystallized. X-ray precession photographs prove space groups P3121 (or the enantiomorphic P3221) for the trigonal and P212121 for the orthorhombic crystals. Density measurements indicate that the asymmetric units of these crystals contain three or two heterotetrameric units (αάβ2), respectively. The packing of both crystal forms is quite different to that of any other crystals reported so far for phycobiliproteins of blue-green and red algae. The cationic detergent benzalkonium chloride (BAC) is strongly bound in the crystals. Both observations indicate a considerable membrane affinity and a unique association behaviour of the phycobiliproteins from cryptomonads.

Key words

Chroomonas Cryptomonad biliprotein Crystallization Phycocyanin-645 Protein crystallography X-ray diffraction 



benzalkonium chloride


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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Walter Morisset
    • 1
  • Werner Wehrmeyer
    • 1
  • Tilman Schirmer
    • 2
  • Wolfram Bode
    • 2
  1. 1.Fachbereich Biologie-Botanik der Universität MarburgMarburgFederal Republic of Germany
  2. 2.Max-Planck-Institut für BiochemieMartinsriedFederal Republic of Germany

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