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An epitope of rice threonine- and hydroxyproline-rich glycoprotein is common to cell wall and hydrophobic plasma-membrane glycoproteins

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Abstract

A monoclonal antibody, LM1, has been derived that has a high affinity for an epitope of hydroxyproline-rich glycoproteins (HRGPs). In suspension-cultured rice (Oryza sativa L.) cells the epitope is carried by three major proteins with different biochemical properties. The most abundant is the 95-kDa extracellular rice extensin, a threonine- and hydroxyproline-rich glycoprotein (THRGP) occurring in the cell wall and secreted into the medium. This THRGP can be selectively oxidatively cross-linked in the presence of hydrogen peroxide and an endogenous peroxidase with the result that it does not enter a protein gel. A second polypeptide with the LM1 epitope (180 kDa), also occurring in the suspension-cultured cells and medium, is not oxidatively cross-linked. Three further polypeptides (52, 65 and 110 kDa) with the characteristics of hydrophobic proteins of the plasma-membrane also carry the LM1 epitope as determined by immuno-blotting of detergent/aqueous partitions of a plasma-membrane preparation and immuno-fluorescence studies with rice protoplasts. At the rice root apex the LM1 epitope is carried by four glycoproteins and is developmentally regulated. The major locations of the epitope are at the surface of cells associated with the developing protoxylem and metaxylem in the stele, the longitudinal radial walls of epidermal cells and a sheath-like structure at the surface of the root apex.

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Abbreviations

AGP:

arabinogalactan protein

ELISA:

enzyme-linked immunosorbent assay

HRGP:

hydroxyproline-rich glycoprotein

THRGP:

threonine- and hydroxyproline-rich glycoprotein

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This work was supported by The Leverhulme Trust. We also acknowledge support from The Royal Society and thank Prof. L.A. Staehelin for the carrot extensin, N. Stacey for the rice cell culture and Dr. J. Keen for protein sequencing.

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Smallwood, M., Martin, H. & Knox, J.P. An epitope of rice threonine- and hydroxyproline-rich glycoprotein is common to cell wall and hydrophobic plasma-membrane glycoproteins. Planta 196, 510–522 (1995). https://doi.org/10.1007/BF00203651

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