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논문 기본 정보

자료유형
학술대회자료
저자정보
Choi, Won-Ja (Department of Biological Sciences, Ewha Womans University)
저널정보
한국통합생물학회 한국동물학회 학술대회 한국동물학회 1995년도 한국생물과학협회 학술발표대회
발행연도
1995.1
수록면
83 - 83 (1page)

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The three chitin synthetases of Saccharomyces cerevisiae, Chs1, Chs2, and Chs3, participate in septum and cell wall formation of vegetative cells and in wall morphogenesis of conjugating cells and spores. Because of the differences in the nature and in the time of execution of their functions, the synthetases must be specifically and individually regulated. The nature of that regulation has been investigated by measuring changes in the levels of the three synthetases and of the messages of the three corresponding gnes, CDSI, CHS2, and CAL1/CSD2/DITl0l(referred to below as CAL1), during the budding cycles. For Chs1 and Chs3, posttranslational regulation, probably by activation of latent forms, appears to be predominant. Since Chs2, like Chs1, is found in the cell in the zymogenic form, a posttranslational activation step appears to be necessary for this synthetase also. The regulation mechanism was investigated to search the relationship of CAL1, CAL2 and CALJ which is involved in Chs3 activity us ing different assay methods other than previous one. Treatment of Chs3-containing membranes with detergents drastically reduced the enzymatic activity. Activity could, however, be restored by subsequent incubation with trypsin or other pro teases in the presence of UDPGlcNAc. Experiments wi th mutants in the three genes invoIved in Chs3 activity-CAL1, CAL2, and CALJ-showed that only CAL1 and CALJ are required for the proteaseelicited (zymogenic) activity. It is concluded that Chs3 IS a zymogen and that the CAL2 product funct ions as its activator.ivator.

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