A 55 kDa plasma membrane‐associated polypeptide is involved in β‐1,3‐glucan synthase activity in pea tissue

Abstract
By glycerol gradient centrifugation of a detergent-solubilized plasma membrane fraction from pea tissue, we find a polypeptide of 55 kDa that copurifies with β-1,3-glucan synthase activity. An antiserum against this polypeptide adsorbs glucan synthase activity and the 55 kDa polypeptide from digitonin-solubilized plasma membrane. These results indicate that the 55 kDA polypeptide is involved in pea β-1,3-glucan synthase activity.