PMID: 7544182Jan 1, 1995Paper

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

Planta
M SmallwoodJ Paul Knox

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 wi...Continue Reading

Citations

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