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Plant Physiol, July 2001, Vol. 126, pp. 1314-1322

Influence of Growth Conditions and Developmental Stage on N-Glycan Heterogeneity of Transgenic Immunoglobulin G and Endogenous Proteins in Tobacco Leaves

Ingrid J.W. Elbers, Geert M. Stoopen, Hans Bakker, Lucas H. Stevens, Muriel Bardor, Jos W. Molthoff, Wilco J.R.M. Jordi, Dirk Bosch, and Arjen Lommen*

State Institute for Quality Control of Agricultural Products (RIKILT), P.O. Box 230, NL-6700 AE Wageningen, The Netherlands (I.J.W.E., A.L.); Plant Research International, P.O. Box 16, NL-6700 AA Wageningen, The Netherlands (G.M.S., H.B., L.H.S., J.W.M., W.J.R.M.J., D.B.); and Laboratoire des Transports Intracellulaires-Centre National de la Recherche Scientifique 6037, IFRMP 23, Université de Rouen, 76821 Mont Saint Aignan, France (M.B.)

Plants are regarded as a promising system for the production of heterologous proteins. However, little is known about the influence of plant development and growth conditions on N-linked glycosylation. To investigate this, transgenic tobacco (Nicotiana tabacum cv Samsun NN) plants expressing a mouse immunoglobulin G antibody (MGR48) were grown in climate rooms under four different climate conditions, i.e. at 15°C and 25°C and at either low or high light conditions. N-glycans on plantibodies and soluble endogenous proteins were analyzed with matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry (MS). Antibodies isolated from young leaves have a relatively high amount of high- mannose glycans compared with antibodies from older leaves, which contain more terminal N-acetylglucosamine. Senescence was shown to affect the glycosylation profile of endogenous proteins. The relative amount of N-glycans without terminal N-acetylglucosamine increased with leaf age. Major differences were observed between glycan structures on endogenous proteins versus those on antibodies, probably to be attributed to their subcellular localization. The relatively high percentage of antibody N-glycan lacking both xylose and fucose is interesting.

* Corresponding author; e-mail a.lommen{at}rikilt.wag-ur.nl; fax 31-317-417717.

© 2001 American Society of Plant Physiologists


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