A novel ubiquitin carboxyl terminal hydrolase is involved in toad oocyte maturation |
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Authors: | ZHAO GUI SUN WEI HUA KONG YAN JUN ZHANG SHAN YAN JI NING LU ZHENG GU FENG LIN JIA KE TSO National Laboratory of Contraceptives and Devices Research |
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Institution: | ZHAO GUI SUN1,2,3,*,WEI HUA KONG2,*,YAN JUN ZHANG2,SHAN YAN1,JI NING LU1,ZHENG GU1,FENG LIN1,JIA KE TSO1,**1 National Laboratory of Contraceptives and Devices Research,Shanghai Institute of Planned ParenthoodResearch,Shanghai 200032,China2 Colle |
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Abstract: | p28, a 28kD protein from toad (Bufo bufo gargarizans) oocytes, was identified by using p13sucl-agarose affinity chromatography. Sequence homology analysis of the full-length cDNA of p28 (Gene Bank accession number: AF 314091) indicated that it encodes a protein containing 224 amino-acids with about 55% identities and more than 70% positives to human, rat or mouse UCH-L1, and contains homological functional domains of UCH family. Anti-p28 monoclonal antibody, on injecting into the oocytes, could inhibit the progesterone-induced resumption of meiotic division in a dose-dependent manner. The recombinant protein p28 showed similar SDS/PAGE behaviors to the native one, and promoted ubiquitin ethyl ester hydrolysis, a classical catalytic reaction for ubiquitin carboxyl terminal hydrolases (UCHs). The results in this paper reveal that a novel protein, p28, exists in the toad oocytes, is a UCH L1 homolog, was engaged in the process of progesterone-induced oocyte maturation possibly through an involvement in protein turnover and degradation. |
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Keywords: | p28 cDNA clone recombinant expression ubiquitin carboxyl terminal hydrolase oocyte maturation |
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