蔗糖合酶抗体制备及其在水稻灌浆期蔗糖合酶含量检测中的应用

采用匀浆粗提、硫酸铵分级沉淀、Sephadex G-100、DEAE-32、Sepharose CL-6B等方法从水稻品种武育粳3号籽粒中分离纯化蔗糖合酶,所得的酶蛋白在非变性聚丙烯酰胺凝胶电泳胶上呈现一条深染色的蛋白酶带。HPLC测定其浓度为71．2％,SDS—PAGE测得的酶分子量为380ku。用得到的酶蛋白作为抗原,通过皮内多位点分次注射法免疫新西兰白兔获得免疫抗体,用此抗体成功地检测到水稻籽粒灌浆过程中蔗糖合酶蛋白的含量变化。     

An 11-ketotestosterone induced kidney-secreted protein: the nest building glue from male three-spined stickleback, Gasterosteus aculeatus

In male three-spined sticklebacks, Gasterosteus aculeatus, the kidney hypertrophies during the breeding season and produces a glue which is used in nest-building. This hypertrophy is androgen dependent with 11-ketotestosterone (11 KT) being most effective. The aim of the present study was to characterize the protein composition of this glue. Threads of glue were collected from stickleback nests and glue material was sampled from the content of urinary bladders of male sticklebacks in breeding condition. The samples were investigated using sodium dodecyl sulphate- polyacrylamide gel electrophoresis (SDS-PAGE). One major glycoprotein dominated in both the nest-threads and urinary bladder samples. The identified glycoprotein had a molecular mass of approximately 203 kDa. After deglycosylation the molecular mass was approximately 200 kDa. The amino acid composition of the protein from urinary bladder content was almost identical to the amino acid composition of the protein from the nest-threads. The protein had a relatively high content of cysteine (7.6–8.0%). The glycoprotein was named spiggin. Spiggin was absent in the urinary bladder of untreated castrated fish, but spiggin was present in sham- operated fish and in castrated fish treated with 11 KT. These results demonstrate that spiggin is induced by 11 KT. Spiggin is so far the only protein known to be induced by 11KT and based on the present findings we suggest that spiggin represents a novel structural protein.     

小麦高、低分子量谷蛋白亚基单向一步分离法新探

利用50%的异丙醇提取普通小麦谷蛋白亚基,并用单向一步 SDS-PAGE 的方法较好地分离了小麦高、低分子量谷蛋白亚基,同时还研究了不同的提取方法及电泳条件对提取效果的影响。结果表明预处理和烷化作用对低分子量谷蛋白亚基的分离效果影响较大。该方法比较简便且分辨率较高,可以用于我国小麦低分子量谷蛋白亚基的各项研究。     

鸡体内小肠液和模拟小肠液对饲料蛋白质消化的比较研究

本试验旨在比较鸡体内小肠液(ESIF)和模拟小肠液(SSIF)对饲料蛋白质进行仿生消化后残渣中蛋白质分解产物片段分布的差异.采用两样本比较试验设计,其中小肠液分别为ESIF和SSIF,以豆粕、棉籽粕、菜籽粕、玉米蛋白粉和酪蛋白为蛋白质饲料原料的代表性底物.在单胃动物仿生消化系统中,以2种小肠液对每个饲料原料进行仿生消化...     

东方小麦高分子量谷蛋白亚基组成分析

采用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)方法,对87份东方小麦(TriticumturanicumJakubz.)的高分子量谷蛋白亚基(HMW-GS)组成检测表明,Glu-A1和Glu-B1分别具有2种和5种不同的亚基类型。在Glu-B1位点上,东方小麦具有其明显的特点,13+16亚基出现频率最高,达60.92%,而这种亚基在普通小麦中属稀有亚基。在Glu-A1位点上,东方小麦与普通小麦、密穗小麦和硬粒小麦相似,null为主要亚基类型。筛选出具有2或7+8优质亚基的材料各9份,其中来自埃塞俄比亚的1份材料CItr14598具有(2,7+8)优质亚基组合,确属品质育种中难得的优异基因资源,可供普通小麦优质育种利用。     

圆锥小麦高分子量谷蛋白亚基组成分析

为了寻找新的基因资源，为小麦品质改良提供基础材料，应用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)方法，对中国西部和北部地区123份圆锥小麦材料高分子量谷蛋白亚基(HMW-GS)的组成进行了分析，共检测到15种HMW—GS组合类型。14个等位变异中有5种类型即Glu-Al-Ⅰ、Glu-B1-Ⅰ、Glu-B1-Ⅱ、Glu-B1-Ⅲ、Glu-B1-Ⅳ在普通小麦中不常见。类似于17 18亚基组合的Glu-B1-Ⅲ分布频率高达到63．40％，亚基2^*出现的频率远远高于普通小麦，另外发现一份含有编码与小麦抗病性关系密切的21亚基的材料可应用于小麦抗病育种中。分析结果表明，圆锥小麦的HMW—GS共有丰富的多态性和亚基组合类型，优质亚基分布频率高，是小麦育种的宝贵基因资源。