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Published on October 13, 2006; 10.1104/pp.106.087437

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Received July 27, 2006
Accepted September 24, 2006

The Liverwort Marchantia polymorpha Expresses Orthologs of the Fungal Agaricus bisporus Agglutinin Family

Willy J. Peumans , Elke Fouquaert , Alain Jauneau , Pierre Rougé , Nausicaä Lannoo , Hiroki Hamada , Richard Alvarez , Bart Devreese , and Els J.M. Van Damme *

Nievelveldweg 9, B-9310 Aalst, Belgium
Department of Molecular Biotechnology, Lab. Biochemistry and Glycobiology, Ghent University, Coupure Links 653, 9000 Gent, Belgium
IFR40-CNRS, Signalisation et Biotechnologie Végétales, 24 Chemin de Borde Rouge, 31326 Castanet Tolosan, France
Surfaces cellulaires et Signalisation chez les Végétaux, UMR CNRS-UPS 5546, Pôle de Biotechnologies Végétales, 24 Chemin de Borde Rouge, B.P. 17, 31326 Castanet-Tolosan, France
Department of Applied Science, Okayama University of Science, 1-1 Ridai-Cho, Okayama 700-0005, Japan
Department of Biochemistry and Molecular Biology, University of Oklahoma, Health Sciences Center, Oklahoma City, Oklahoma 73104
Laboratory for Protein Biochemistry and Protein Engineering, Ghent University, KL Ledeganckstraat 35, 9000 Gent, Belgium

* Corresponding author; email: ElsJM.VanDamme{at}UGent.be.

A lectin different from the previously described mannose-binding agglutinins has been isolated from the liverwort Marchantia polymorpha. Biochemical characterization of the purified lectin combined with the data from earlier transcriptome analyses demonstrated that the novel M. polymorpha agglutinin is not related to any of the known plant lectin families but closely resembles the Agaricus bisporus type lectins, which hitherto have been found exclusively in fungi. Immunolocalization studies confirmed that the lectin is exclusively associated with the plant cells ruling out the possibility of a fungal origin. Extensive screening of the publicly accessible databases confirmed that apart from fungi the occurrence of A. bisporus type lectins is confined to M. polymorpha and the moss Tortula ruralis. The expression of a typical fungal protein in a liverwort and a moss raises the question of the origin of the corresponding genes. Irrespective of the evolutionary origin, the presence of a functional A. bisporus lectin ortholog in M. polymorpha provides evidence for the expression of an additional carbohydrate binding domain in Viridiplantae.




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