FlagHAdoubletagIP
实验概要Isolate the unknown protein that could interact with bait from cell lysate, for potential Mass spectrometry.主要试剂50mM Tris, pH8.020 mM glycerol b-phosphate, pH 7.520 mM NaF0.5 mM sodium Orthovannadate5 mM sodium pyrophosphate 137mM NaCl1mM EDTA1% Triton X10010% glycerol实验步骤 Havest the cells by centrifugation at 1,000 rpm for 3 min. Wash the cells with ice cold PBS twice.Resuspend the cell pellet with 5 v......阅读全文
Signaling-Pathway-from-GProtein-Families
G-aS-coupled receptors stimulate adenylyl cyclase (AC), which synthesizes cAMP from ATP. In contrast Gai-coupled receptors inhibit AC and so reduce cA
Fusion-Protein-Isolation(融合蛋白分离纯化)
Peter Novick Lab,Department of Cell Biology Yale University School of Medicinehttp://info.med.yale.edu/cellbio/Novick/Second/Protocols/Fusion.pdf1.Sta
Overview-of-telomerase-protein-component-gene-hTert-Transcriptional
Telomerase is an enzyme which replicates the terminal sequences of eukaryotic chromosomes, namely the telomeres. Cells which have an unlimited replica
蛋白产物(protein-products)的检测实验
一、组织蛋白的裂解提取:1.分别取-70℃保存的各组动物的样品(半个脑、0.5g肌肉),放入小离心管中,在冰浴上以PBS充分洗涤2次,除去残留血液。2.用无菌手术剪和镊子将大鼠肌肉剪碎(脑样品不用剪碎),放入另一小离心管中,于0℃以 PBS充分洗涤,4℃,3000 rpm离心5分钟。3.吸出上清夜,
Bradford法蛋白定量(Bradford-Protein-Assay-)
Bradford Assay is a rapid and accurate method commonly used to determine the total protein concentration of a sample. The assay is based on the observ
Factor-Xa-Cleavage-of-MBPFusion-protein
INTRODUCTIONIn many cases the cleavage can be performed using the free intact fusion, or in same cases with the fusion protein bound to a matrix. The
Activation-of-Src-by-Proteintyrosine-phosphatase-alpha
Progression through the cell cycle is accompanied by activation of the proto-oncogene c-Src, a protein tyrosine kinase. Overexpression of Src leads to
GProtein-Signaling-Through-Tubby-Proteins
The tubby gene product is expressed in the brain and has been implicated by mouse genetics in obesity and other disorders such as blindness. Structura
Green-Fluorescent-Protein-as-an-Indicator-ofTransfection-in-Chicken-Embryos
Green fluorescent protein (GFP) is responsible for the bioluminescence of the Pacific Northwest jellyfish, Aequorea victoria. In A.victoria, the 27-kD
Purification-of-Kar3-Motor-Domain-Protein
Purification of Kar3 Motor Domain ProteinMaterialsInduced cells (2 - 5 g pellet of pET/Kar3 in BL31(DE3)pLysS host cells) (See note #1)HEM buffer =10
Use-of-the-Bradford-Protein-Assay-in-a-Microtiter-Plate-Format
Introduction The Bradford protein assay is a simple procedure for determination of protein concentrations in solutions that depends upon the change in
Activation-of-cAMPdependent-protein-kinase,-PKA
G-protein coupled receptors (GPCRs) are one of the largest gene families of signaling proteins. Residing in the plasma membrane with seven transmembra
Studying-Arabidopsis-Envelope-Protein-Localization-and-Topology-Using-...
Chloroplasts are metabolically important organelles that perform many essential functions within plant cells. The chloroplasts can be subdivided i
Protein-A--G亲和层析的原理
对于IgG的纯化,大部分情况下我们都会选择使用Protein A或Protein G进行亲和层析。因为它们对于IgG的Fc段具有特异性的亲和作用,而对于其他杂蛋白没有或者只有很弱的结合。通常,仅仅凭借Protein A或Protein G一步亲和层析就可使蛋白纯度达到≥90%。
protein-G-适合纯化什么类型的蛋白
protein G 是一种细菌的外膜蛋白,可以特异性地和多种来源的IgG抗体相结合,因此是纯化抗体常用的一种蛋白质分子。它的野生型有多个抗体Fc位置的结合结构域,可以和多个IgG分子相结合,但最为常用的是改造后重组表达的Protein G, 具有2-5个结合结构域。这一个蛋白非常稳定,纯化以及保存操
表达蛋白(Expressed-protein)的分离与纯化
大肠杆菌表达蛋白以可溶和不溶两种形式存在,需要不同的纯化策略。现在,许多蛋白质正在被发现而事先并不知道它们的功能,这些自然需要将蛋白质分离出来后,进行进一步的研究来获得。分析蛋白质的方法学现已极大的简化和改进。必须承认,蛋白质纯化比起DNA 克隆和操作来是更具有艺术性的,尽管DNA 序列具有异乎
酵母表达外源蛋白(foreign-protein)(1)
1、 菌株用GS115表达不出蛋白,换KM71H后,大部分克隆能表达。2、温度: 在28度和室温下诱导表达,表达水平可能都不低。3、pH手册上用6.0,pH提高到6.8,不表达的蛋白可能就表达出来。BMMY的pH7.0-7.5比较合适。国内外做的最好的rHSA,最适pH大概 5-6左右。pH3的时候
Mapping-Protein-Distributions-on-Polytene-Chromosomes-by-Immunostaining1
INTRODUCTIONThe formidable size and structure of polytene chromosomes allowmapping of chromosomal protein distributions at very high resolution.This p
酵母表达外源蛋白(foreign-protein)(4)
15、菌体密度:菌体是在BMMY中培养的,可以不用BMMY做对照,在600nm处测OD值,培养基和PBS光吸收都很低,PBS更方便。麦芽浸提液培养酵母(不换液,补料),生长阶段结束后,密度可达到10-12,诱导培养结束后,密度可达到18左右。如果用1体积的BMGY,在生长阶段结束后,换液时,加入1/
Analysis-of-total-E.-coli-protein-by-SDS-PAGE
1. In microfuge tubes, spin down 0.1 ml of uninduced cells grown to near saturation or 0.15 ml of IPTG induced cells. Remove YT (or LB) media with a p
Mapping-Protein-Distributions-on-Polytene-Chromosomes-by-Immunostaining2
12. Hold the salivary glands at the common duct with tweezers.Transfer the glands to a drop of fixing solution on a siliconizedcoverslip. 13. Incubate
酵母表达外源蛋白(foreign-protein)(5)
或者第5步和第6步改为丙酮洗:5.加入200ul冰冷的丙酮,用手指轻弹EP管,洗去管底和管壁残余的TCA。6.15000g,离心10-20分钟,倒掉上清,将EP管倒扣在吸水纸上轻轻控几下,除去残余在管口的液体。样品是酵母细胞超声后离心获得的上清,用Loading buffer溶解蛋白沉淀,始终不
酵母表达外源蛋白(foreign-protein)(2)
如果是用自己配置的培养基,如玉米浸提液、麦芽浸提液、麦麸浸提液等等,可以不用换液,采取添料来维持酵母对培养基的营养需要。用无机盐进行大规模发酵,更省钱。大规模发酵时,甲醇的流加速度增加不要太快。另外使用纯氧并不昂贵,在武汉买个钢瓶600元左右,一瓶纯氧20元。一个批次100h左右估计3-4 瓶氧气。
酵母表达外源蛋白(foreign-protein)(3)
12、蛋白降解分泌表达的目标蛋白比胞内蛋白确实容易被降解。可以尝试以下几种办法:1、尽可能降低培养液的pH值减少酶活,酵母生长pH值比较广,4~7都可以试一下;2、多试几种蛋白添加剂,充当酶解底物(比如酵母酸);3、摸索最适下罐(摇瓶也一样),宁可少表达点也别给降解光了。实在没办法,只好换菌株或做p
植物叶蛋白(the-plant-leaf-protein)的提取
一、实验目的熟悉植物叶蛋白的几种提取原理和方法,了解其意义及其应用价值。二、实验原理植物叶蛋白或称绿色蛋白浓缩物 (leaf protein concentration,简称LPC),是从新鲜植物叶片中提取的高质量浓缩蛋白质,不仅是畜禽生长发育和生产畜产品的主要营养物质,而且目前也正成为人类的保
蛋白质结构预测(protein-structure-prediction)
一种生物体的基因组规定了所有构成该生物体的蛋白质,基因规定了组成蛋白质的氨基酸序列。虽然蛋白质由氨基酸的线性序列组成,但是,它们只有折叠成特定的空间构象才能具有相应的活性和相应的生物学功能。了解蛋白质的空间结构不仅有利于认识蛋白质的功能,也有利于认识蛋白质是如何执行其功能的。确定蛋白质的结构对于生物
Ca++/-Calmodulindependent-Protein-Kinase-Activation
The calcium/calmodulin-dependent kinases (CaMKs) are involved in a large number of cellular responses induced by hormones, neurotransmitters and other
SDSPAGE检测蛋白表达(protein-expression)
一、材料与仪器30%丙烯酰胺溶液;1.5mol/L Tris-HCl分离胶缓冲液,PH8.8;1.0mol/L Tris-HCl浓缩胶缓冲液,PH6.8;电泳缓冲液,PH8.3;10%SDS溶液;10%过硫酸铵溶液;样品处理液;染色液;脱色液;电泳玻璃板,电泳电源架,电泳槽,电泳仪等;蛋白Mar
蛋白质分析技术(Analytical-Techniques-for-Protein)3
六、SDS-PAGE1.SDS及SDS-PAGE(1)SDS:十二烷基硫酸钠(sodium decyl sulfate,SDS),一种阴离子去污剂,它能以一定的比例和蛋白质结合,形成一种SDS—protein的复合物。(2)SDS- PAGE:具有SDS的PAGE,分离SDS—protein复合物,
Protein-G树脂填料磁珠特点与优势
Protein G是在C组和G组链球菌细菌中表达的免疫球蛋白结合蛋白,虽然与Protein A非常类似,但具有不同的结合特异性。它是65kDa(G148蛋白G)和58kDa(C40蛋白G)细胞表面蛋白,通过与Fab和Fc区的结合来纯化抗体。天然分子Protein G还能结合白蛋白,但由于血清