【目的】克隆家蚕精氨酸激酶基因,分析其基因结构与表达特性,为揭示无脊椎动物体内能量代谢调节规律提供重要基础。【方法】通过分析家蚕EST、利用RACE法和基因组文库筛选法克隆了家蚕精氨酸激酶(BmAK,Bombyx mori arginine kinase)基因...【目的】克隆家蚕精氨酸激酶基因,分析其基因结构与表达特性,为揭示无脊椎动物体内能量代谢调节规律提供重要基础。【方法】通过分析家蚕EST、利用RACE法和基因组文库筛选法克隆了家蚕精氨酸激酶(BmAK,Bombyx mori arginine kinase)基因,并对其基因结构和表达特性进行了分析。【结果】克隆了BmAK基因,cDNA全长为1 268bp,编码355个氨基酸,具有精氨酸激酶典型的酶活性部位氨基酸序列,酶活性中心位点氨基酸和能形成离子偶结构氨基酸;该基因由2个外显子和1个内含子组成;5′调控序列存在BRCZ、E74A、FTZ等多个潜在转录因子结合位点,但没有TATA盒启动子序列;该基因的表达在不同组织和不同发育时期存在明显差异。【结论】BmAK具有精氨酸激酶的典型特征,BmAK基因表达随发育时期不同而发生变化,基因的表达可能受蜕皮激素调控。展开更多
目的:鉴定凡纳滨对虾分子质量40 k D过敏原,并分析其在有壳水产食物中的免疫交叉反应。方法:运用基质辅助激光解析串联飞行时间质谱仪(matrix assisted laser desorption ionization/time of flight mass spectrometry,MALDI-TOF/TOF-MS...目的:鉴定凡纳滨对虾分子质量40 k D过敏原,并分析其在有壳水产食物中的免疫交叉反应。方法:运用基质辅助激光解析串联飞行时间质谱仪(matrix assisted laser desorption ionization/time of flight mass spectrometry,MALDI-TOF/TOF-MS)鉴定凡纳滨对虾40 k D过敏原组分;使用软件BLAST、Clustal X2、MEGA 5.0分析该蛋白氨基酸序列的种间同源性;制备抗凡纳滨对虾过敏原精氨酸激酶的多克隆抗体,并与17种常见有壳水生动物粗提液进行Western blotting,以分析该过敏原的免疫交叉反应。结果:凡纳滨对虾40 k D过敏原为精氨酸激酶(arginine kinase,AK);其氨基酸序列同源性分析显示AK在虾类(96%~100%)、蟹类(91%~93%)、贝类(49%~52%)、蟑螂(83%)中具有很高的同源性;Western blotting结果显示抗AK多抗与17种不同虾类、蟹类、贝类的AK均能发生反应。结论:精氨酸激酶在甲壳类动物、软体动物、甚至昆虫中具有高度保守性,且能引起强免疫交叉反应,是有壳水生动物中的一种泛过敏原。展开更多
Trifluoroethanol has often been used in protein folding studies. The changes in activity and unfolding of arginine kinase from shrimp Feneropenaeus chinensis muscle during denaturation in different concentrations o...Trifluoroethanol has often been used in protein folding studies. The changes in activity and unfolding of arginine kinase from shrimp Feneropenaeus chinensis muscle during denaturation in different concentrations of trifuoroethanol were investigated using far ultraviolet circular dichroism and fluorescence emission spectra. Arginine kinase was inactivated in trifluoroethanol solutions. The tertiary and secondary structures of arginine kinase were also destroyed in the trifluoroethanol solutions. The unfolding and inactivation courses were measured and compared. Inactivation occurred prior to unfolding, which suggests that the arginine kinase active site is more easily damaged by the denaturant than the enzyme as a whole. The result also indicates that the arginine kinase active site is situated in a limited and flexible region of the enzyme molecule.展开更多
文摘【目的】克隆家蚕精氨酸激酶基因,分析其基因结构与表达特性,为揭示无脊椎动物体内能量代谢调节规律提供重要基础。【方法】通过分析家蚕EST、利用RACE法和基因组文库筛选法克隆了家蚕精氨酸激酶(BmAK,Bombyx mori arginine kinase)基因,并对其基因结构和表达特性进行了分析。【结果】克隆了BmAK基因,cDNA全长为1 268bp,编码355个氨基酸,具有精氨酸激酶典型的酶活性部位氨基酸序列,酶活性中心位点氨基酸和能形成离子偶结构氨基酸;该基因由2个外显子和1个内含子组成;5′调控序列存在BRCZ、E74A、FTZ等多个潜在转录因子结合位点,但没有TATA盒启动子序列;该基因的表达在不同组织和不同发育时期存在明显差异。【结论】BmAK具有精氨酸激酶的典型特征,BmAK基因表达随发育时期不同而发生变化,基因的表达可能受蜕皮激素调控。
文摘目的:鉴定凡纳滨对虾分子质量40 k D过敏原,并分析其在有壳水产食物中的免疫交叉反应。方法:运用基质辅助激光解析串联飞行时间质谱仪(matrix assisted laser desorption ionization/time of flight mass spectrometry,MALDI-TOF/TOF-MS)鉴定凡纳滨对虾40 k D过敏原组分;使用软件BLAST、Clustal X2、MEGA 5.0分析该蛋白氨基酸序列的种间同源性;制备抗凡纳滨对虾过敏原精氨酸激酶的多克隆抗体,并与17种常见有壳水生动物粗提液进行Western blotting,以分析该过敏原的免疫交叉反应。结果:凡纳滨对虾40 k D过敏原为精氨酸激酶(arginine kinase,AK);其氨基酸序列同源性分析显示AK在虾类(96%~100%)、蟹类(91%~93%)、贝类(49%~52%)、蟑螂(83%)中具有很高的同源性;Western blotting结果显示抗AK多抗与17种不同虾类、蟹类、贝类的AK均能发生反应。结论:精氨酸激酶在甲壳类动物、软体动物、甚至昆虫中具有高度保守性,且能引起强免疫交叉反应,是有壳水生动物中的一种泛过敏原。
基金Supported by the National Key Basic Research Specific Foundation of China(No.G19990 75 6 0 7)
文摘Trifluoroethanol has often been used in protein folding studies. The changes in activity and unfolding of arginine kinase from shrimp Feneropenaeus chinensis muscle during denaturation in different concentrations of trifuoroethanol were investigated using far ultraviolet circular dichroism and fluorescence emission spectra. Arginine kinase was inactivated in trifluoroethanol solutions. The tertiary and secondary structures of arginine kinase were also destroyed in the trifluoroethanol solutions. The unfolding and inactivation courses were measured and compared. Inactivation occurred prior to unfolding, which suggests that the arginine kinase active site is more easily damaged by the denaturant than the enzyme as a whole. The result also indicates that the arginine kinase active site is situated in a limited and flexible region of the enzyme molecule.
