| 1 | A novel ubiquitin carboxyl terminal hydroase is involved in toad oocyte maturation显示文摘p28, a 28kD protein from toad (Bufo bufo gargarizans) oocytes, was identified by using p13suc1-agaroseaffinity chromatography. Sequence homology analysis of the full-length cDNA of p28 (Gene Bank accessionnumber: AF 314091) indicated that it encodes a protein containing 224 amino-acids with about 55% iden-tities and more than 70% positives to human, rat or mouse UCH-L1, and contains homological functionaldomains of UCH family. Anti-p28 monoclonal antibody, on injecting into the oocytes, could inhibit theprogesterone-induced resumption of meiotic division in a dose-dependent manner. The recombinant proteinp28 showed similar SDS/PAGE behaviors to the native one, and promoted ubiquitin ethyl ester hydrolysis,a classical catalytic reaction for ubiquitin carboxyl terminai hydrolases (UCHs). The results in this paperreveal that a novel protein, p28, exists in the toad oocytes, is a UCH L1 homolog, was engaged in theprocess of progesterone-induced oocyte maturation possibly through an involvement in protein turnover anddegradation. | 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 | 2002 | Cell Research2002，12，4： | 8 |
| 2 | 蟾蜍泛素羧基末端水解酶(tUCH)以不依赖其UCH活性的方式参与卵母细胞成熟调控显示文摘本实验室已报道中华大蟾蜍卵母细胞的p28蛋白具泛素羧基末端水解酶活性,称作tUCH,它和哺乳类中发现的UCH L1的氨基酸序列具高度同源性,二级结构同源性比较发现,二者可能具类似的功能。本文实验表明:未成熟卵母细胞和成熟卵母细胞的可溶性蛋白中均含有tUCH,约占提取物中蛋白质总量的2%。根据测定所得到的GST-tUCH和GST-UCH L1对底物Ub-AMC的酶动力学参数,说明卵母细胞中tUCH可能与小鼠UCH L1有类似的生物学功能;anti-tUCH单抗可以与原核细胞表达的tUCH和显性失活突变类型tUCH C(90)S特异结合,但不识别小鼠的UCH L1。Anti-tUCH单抗能够和tUCH结合但不能封闭它的UCH活性。当anti-tUCH单抗注入卵母细胞内,则孕酮诱导的生发泡破裂(germinal vesicle breakdown,GVBD)过程受到抑制,足见tUCH参与GVHD调节并不依赖其UCH活性。 | 孙兆贵 孔维华 颜山 顾正 左嘉客 | 2003 | 实验生物学报2003，36，2： | 4 |
| 3 | 抗Y-box结合蛋白冷休克域单克隆抗体的制备及其初步应用显示文摘固相法合成Y -box结合蛋白冷休克域部分片段“14肽”(H2 N NGYGFINRNDTKED COOH ,简称ND) ,用不同载体蛋白经戊二醛一步法偶联得到免疫抗原 (BSA ND)和检测抗原 (OVA ND) .用免疫抗原免疫BLAB c小鼠 ,经间接法ELISA检测 ,得到对ND有足够免疫应答的小鼠 .采用常规单克隆抗体制备的方法 ,得到 3株能稳定产生和分泌抗ND单抗的克隆细胞株 ,单抗的亚型均为IgM .WesternBlotting结果显示 :该单抗能识别中华大蟾蜍 (Bufobufogar garizans)Ⅰ、Ⅱ期卵母细胞中的热稳定Y box结合蛋白p5 4 ,并能识别中华大蟾蜍高、低温卵中一种分子量约为 80kD的蛋白 (简称p80 ) .由于p80在低温卵中含量高于高温卵中 ,推测可能是高温卵和低温卵中差异表达的Y box结合蛋白之一 . | 颜山 孔维华 顾正 左嘉客 | 2003 | 山东大学学报(理学版)2003，38，4： | 0 |
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