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Journal of Histochemistry and Cytochemistry, Vol. 47, 1119-1126, September 1999, Copyright © 1999, The Histochemical Society, Inc.

Symposium Papers

Immunoelectron Microscopy of Peroxisomes Employing the Antibody for the SKL Sequence PTS1 C-terminus Common to Peroxisomal Enzymes

Nobuteru Usudaa, Kohei Johkuraa, Takahisa Hachiyab, and Ayami Nakazawaa
a Department of Anatomy and Cell Biology, Shinshu University School of Medicine, Matsumoto, Japan
b Research and Development division, Medical and Biological Laboratories Co., Ltd., Ina, Japan

Correspondence to: Nobuteru Usuda, Dept. of Anatomy and Cell Biology, Shinshu University School of Medicine, Matsumoto 390, Japan.

Immunohistochemistry employing a new hapten antibody that detects the SKL sequence and its variants of the PTS1 C-terminus of peroxisomal enzymes was attempted to visualize peroxisomes across species. Rabbits were immunized with the SKL sequence coupled with KLH, between which an arm molecule was interposed. IgG fractions of antisera were affinity-purified against the hapten and employed for immunochemical analyses and immunoelectron microscopy. The specificity of the antibody was examined by immunoblot analyses for various purified enzymes of rat liver peroxisomes and by dot-blot analyses inhibited by SKL peptide and its variants. Various animal and plant tissues were subjected to immunoelectron microscopy with the protein A–gold technique. The antibody reacted with various enzymes in the peroxisome with the SKL motif. The affinity of the antibody for tripeptides, which varied depending on their structures, was higher for SKL than for its variants. Hepatic and renal peroxisomes of vertebrates, peroxisomes in the fat body of an insect, and the cotyledon of a plant were visualized by immunoelectron microscopy. Immunohistochemistry employing this SKL antibody may provide specific staining that can detect peroxisomes across different species. (J Histochem Cytochem 47:1119–1126, 1999)

Key Words: immunohistochemistry, protein A–gold technique, peroxisome, targeting signal, species


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