抄録
Polyclonal antibodies were raised against synthetic peptides or recombinant polypeptides encoded by Arabidopsis atA0-1 and atAO-2 cDNAs, which have sequences similar to maize and animal aldehyde oxidase (AO) cDNAs. Anti-atAO-1 antibodies recognized AOα and AOβ among the three isoforms, AOα, AOβ, and AOγ, detected in Arabidopsis seedlings after native PAGE, while anti-atAO-2 antibodies reacted with AOβ and AOγ. The polypeptide specifically recognized by each antibody was collected as the Protein-A/IgG/antigen complex. The 150- and 145-kDa polypeptides were purified by SDS-PAGE and digested with Achromobacter Protease I. From the amino acid sequences and molecular masses of the derivative peptides, it was revealed that the 150- and 145-kDa polypeptides were the products of atAO-1 and atAO-2, respectively. Molecular masses of the native forms of AOα, AOβ, and AOγ were estimated as approximately 290-300 kDa. These results suggest that AOα and AOγ are homodimers consisting of atAO-1 and atAO-2 products, respectively, and that AOβ is a heterodirner of the atAO-1 and atAO-2 products.
