Analyses of Expression and Localization of Two Mammalian-Type Transglutaminases in Physarum polycephalum, an Acellular Slime Mold
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概要
- 論文の詳細を見る
Transglutaminase (TGase) is an enzyme that modifies proteins by crosslinking or polyamination. Physarum polycephalum, an acellular slime mold, is the evolutionally lowest organism that has a mammalian-type transglutaminase. We have cloned a cDNA for Physarum polycephalum TGase (PpTGB), homologous to a previously identified TGase (PpTGA), whose sequence is similar to that of mammalian TGases. PpTGB encodes a primary sequence identical to that of PpTGA except for 11 amino acid residues at the N-terminus. Reverse transcription-PCR and Western blotting analyses showed that both PpTGA and PpTGB are expressed in microplasmodia and macroplasmodia during their life cycle, except for in sporangia. For biochemical characterization, we carried out the ectopical expressions of PpTGA and PpTGB in Dictyostelium discoideum. Subcellular fractionation of these Dictyostelium cells showed that the expressed PpTGA, but not PpTGB, localizes to the membrane fraction. Furthermore, in Physarum, subcellular fractionation and immunostaining indicated specific localization at the plasma membrane in macroplasmodia, while the localization was entirely cytoplasmic in microplasmodia.
- 社団法人 日本生化学会の論文
著者
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Maki Masatoshi
Department Of Applied Molecular Biological Sciences Graduate School Of Bioagricultural Sciences Nago
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Nakamura Akio
Department Of Information And Computer Sciences Saitama University
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Wada Fumitaka
Department Of Applied Molecular Biosciences Graduate School Of Bioagricultural Sciences Nagoya Unive
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Hanai Yuko
Department Of Applied Molecular Biosciences Graduate School Of Bioagricultural Sciences Nagoya Unive
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HITOMI Kiyotaka
Department of Applied Biological Sciences, School of Agriculture, Nagoya University
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OGAWA Atsuko
Department of Agricultural Chemistry, Kyoto University
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