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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2000.1
- 수록면
- 165 - 171 (7page)
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Ubiquitinated proteins in lysosomes were characterized by using two monoclonal antibodies (mAbs): LYS8-1, a mAb to lysosomal proteins, and NYA124, a mAb to ubiquitin. LYS8-1 stained lysosome-like vesicles in immunofluorescence microscopy of Amoeba proteus and Acanthamoeba castellanii. In immunoblotting, LYS8-1's antigens (LYS proteins) were detected as 68-kDa and 77-kDa proteins in A. proteus, and as 30-kDa and 39-kDa proteins in A. castellanii. In immunoprecipitation of A. castellanii, at least four distinct LYS proteins, LVS35p, LyS39p, LyS42p, and LYS46p, were detected and accumulated upon inhibition of lysosome functions but not upon that of 26S proteasome functions. They were all found to be ubiquitinated, and were recovered in the lysosome fractions in subcellular fractionation experiments. In chemical fractionation analyses, LYS35p and LYS39p were demonstrated to be peripherally associated with lysosome membrane, while LYS42p and LYS46p tightly bound to the membrane. These results suggest that the LYS proteins become associated to lysosomal membrane upon ubiquitination.
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