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Polypeptide present in various cell fractions obtained from homogenized maize mesocotyls were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, immunoblotted, and screened for cross-reactivity with antibodies against three synthetic polypeptides spanning different regions of the rat heart gap junctional protein connexin43 and the whole mouse liver gap junctional protein connexin32. An antibody raised against a cytoplasmic loop region of connexin43 cross-reacted strongly with a cell wall-associated polypeptide (possibly a doublet) of 26 kilodaltons. Indirect immunogold labeling of thin sections of mesocotyl tissue with this antibody labeled the plasmodesmata of cortical cells along the entire length of the plasmodesmata, including the neck region and the cytoplasmic annulus. Sections labeled with control preimmune serum were essentially free of colloidal gold. An antibody against connexin32 cross-reacted with a 27-kilodalton polypeptide that was present in the cell wall and membrane fractions. Indirect immunogold labeling of thin sections with this antibody labeled the plasmodesmata mainly in the neck region. It is suggested that maize mesocotyl plasmodesmata contain at least two different proteins that have homologous domains with connexin proteins.

Maize mesocotyl plasmodesmata proteins cross-react with connexin gap junction protein antibodies.