alexa Restricted access of proteins to mannan polysaccharides in intact plant cell walls.
Biochemistry

Biochemistry

Journal of Glycobiology

Author(s): Marcus SE, Blake AW, Benians TA, Lee KJ, Poyser C,

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Abstract How the diverse polysaccharides present in plant cell walls are assembled and interlinked into functional composites is not known in detail. Here, using two novel monoclonal antibodies and a carbohydrate-binding module directed against the mannan group of hemicellulose cell wall polysaccharides, we show that molecular recognition of mannan polysaccharides present in intact cell walls is severely restricted. In secondary cell walls, mannan esterification can prevent probe recognition of epitopes/ligands, and detection of mannans in primary cell walls can be effectively blocked by the presence of pectic homogalacturonan. Masking by pectic homogalacturonan is shown to be a widespread phenomenon in parenchyma systems, and masked mannan was found to be a feature of cell wall regions at pit fields. Direct fluorescence imaging using a mannan-specific carbohydrate-binding module and sequential enzyme treatments with an endo-β-mannanase confirmed the presence of cryptic epitopes and that the masking of primary cell wall mannan by pectin is a potential mechanism for controlling cell wall micro-environments. © 2010 The Authors. Journal compilation © 2010 Blackwell Publishing Ltd. This article was published in Plant J and referenced in Journal of Glycobiology

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