ProductionofRecombinantProteinsinSuspensionCulturedPlantCells
Plants have emerged in the past decade as a suitable alternative to the current production systems for recombinant pharmaceutical proteins and, today their potential for low-cost production of high quality, much safer and biologically active mammalian proteins is largely documented. Among various plant expression systems being explored, genetically modified suspension-cultured plant cel......閱讀全文
蛋白質磷酸化
Tyrosine Kinase Assay Using Synthetic Peptides?(T. Miller)Small synthetic peptide substrates are especially well suited for applications such as assay
Ingel-digestion-of-proteins-for-peptide-fingerprint-mapping
Polyacrylamide gel electrophoresis is a widely used technique to separate proteins from biological samples. Moreover, the development of two-dimension
Isoelectric-Focussing-of-Membrane-Proteins-by-Slab-Gel-Method
REFERENCE:?Ames, G.F.L. and Nikaido, H. 1976. Biochemistry. 15:616-623.MATERIALS:Gel solution:1.05 gacrylamide0.032 gbis-acrylamide8.25 gurea6.5 mldis
A-Yeast-Secretion-Trap-Assay-for-Identification-of-Secreted-Proteins-...
Secreted proteins from plants and phytopathogens play important roles in their interactions and contribute to elaborate mechanisms of attack, defe
The-role-of-FYVEfinger-proteins-in-vesicle-transport
Eukaryotic cells take up constituents of the extra-cellular environment and regulate the cell-surface level of membrane proteins via a recycling syste
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
SemiQuantitative-Measurement-of-Proteins-by-Dot-Blotting
Purpose...Concentration of proteins in a crude preparations (such as culture sup) can be estimated semi-quantitatively by using "Dot Blot" method if y
歐盟評估一種α淀粉酶的安全性
據歐盟食品安全局(EFSA)消息,近日,歐盟食品安全局就一種α-淀粉酶(alpha‐amylase)用于淀粉,葡萄糖漿和蒸餾酒精生產的安全性發布意見。 這種α-淀粉酶是利用轉基因地衣芽孢桿菌產生的食品酶。歐盟食品安全局專家組對這種α-淀粉酶的安全性進行了評估。專家組經過評估認為,這種α-淀粉
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
重組質粒(dna-recombinant-plasmid)的篩選實驗步驟
實驗儀器控溫搖床水浴鍋 冰箱(-20,‐70℃) 超凈工作臺 培養箱 實驗試劑 Amp LB IPTG X-Gal 平皿 玻棒 三角瓶 離心管 移液器 tip 實驗步驟: 20人/班 1平皿/人 挑取可疑的白色菌落,移植于2mL的LB中,250轉/分搖菌、37℃培養過夜。以快
重組蛋白[Recombinant-Protein]純化的基本策略
一、融合表達蛋白的純化:融合表達蛋白可以在原目標分子之外帶有GST肽段或(His)6肽段,從而使得可以分別用Glutathione Sepharose凝膠或Chelating Sepharose凝膠進行親和色譜分子,一步可以達到~90%的純度,經過特異蛋白酶切后,再進行離子交換及高分辨凝膠過
歐盟評估一種麥芽糖淀粉酶的安全性
2019年7月29日,歐盟食品安全局(EFSA)發布關于來自轉基因大腸桿菌(菌株BLASC)的麥芽糖淀粉酶 (maltogenic amylase)安全性的評估結果。 據了解,這種食品酶是由Advanced Enzyme Technologies公司用轉基因大腸桿菌(菌株BLASC)生產的。這
In-Vitro-Production-of-Sweet-Peas-(Lathyrus-odoratus-L.)-via-Axillary-Shoot
The genus Lathyrus is best known because it includes a number of wild relatives of the protein pea which, despite being generally neglected and un
單克隆抗體制備(McAb-production)的基本過程
抗原提純與動物免疫? 對抗原的要求是純度越高越好,尤其是初次免疫所用的抗原。如為細胞抗原,可取1×107個細胞作腹腔免疫。可溶性抗原需加完全福氏佐劑并經充分乳化,如為聚丙烯酰胺電泳純化的抗原,可將抗原所在的電泳條帶切下,研磨后直接用以動物免疫。? 選擇與所用骨髓瘤細胞同源的BALB/c健康小鼠,
Screening-Bacterial-Colonies-Using-Xgal-and-IPTG:-αComplementation
實驗概要? ? ? ? α-complementation occurs when two inactive fragments of E. coli β-galactosidase associate to form a functional?enzyme. Many plasmid
EFSA將評估L色氨酸作為添加劑的安全性
近日,據歐盟食品安全局(EFSA)消息,應歐盟委員會的要求,歐盟動物飼料添加劑和產品(FEEDAP)研究小組就大腸桿菌KCCM 80152發酵產生的L-色氨酸(L-tryptophan)作為所有動物品種飼料和飲用水的營養添加劑發表科學意見。 經過評估,該小組認為,這種添加劑對非反芻動物目標物種
歐盟評估一種纖維素酶的安全性
據歐盟食品安全局(EFSA)消息,2019年10月18日,歐盟食品安全局就來自轉基因里氏木霉菌株DP‐Nzc36的纖維素酶(cellulase)的安全性評價發布意見。 據了解,這種纖維素酶旨在用于蒸餾酒精生產、生產葡萄糖漿的淀粉加工和釀造過程中。經過評估,評估小組認為在預期使用條件下這種食品酶
Bioactive-Peptide-Induced-Signaling-Pathway
Many different peptides act as signaling molecules, including the proinflammatory peptide bradykinin, the protease enzyme thrombin, and the blood pres
使用CO2恒溫搖床解決人胚腎-293-(HEK293)-細胞結團問題
人胚腎 293 (HEK293)? 細胞在重組蛋白表達中是最常見的宿主細胞。 這類細胞能夠表達大量的膜蛋白,如 G 蛋白偶聯受體? (GPCR) ,是無法在最常見的生物制藥生產宿主,如:中國倉鼠卵巢 (CHO) 細胞中作表達。 HEK293 雖然是蛋白表達的極好宿主,然而 HEK293 細胞
GST融合蛋白的準備
Preparation of Glutathione-S-Transferase (GST) Fusion ProteinsMargret B. Einarson and Elena N. Pugacheva?Foxx Chase Cancer Center, Philadelphia, PA 19
Preparation-of-Bacterial-Proteins-for-Analysis-by-2DPAGE
The following protocol has been developed for preparing soluble bacterial proteins in a form suitable for analysis by 2D-PAGE. The procedure was princ
目標蛋白(target-proteins)粗提方法3
3)pH值 一般在被提取蛋白質的等電點的兩側,堿性蛋白用稀酸提取、酸性蛋白用稀堿提取。在某些情況下,為了破壞所分離的蛋白質與其他雜質的靜電結合,選擇偏酸(pH3-6)或偏堿(pH10-11),可以使離子鍵破壞而獲得單一的蛋白成分。4)溫度 提取時通常要求低溫操作。只有對某些耐高溫的蛋白質或酶(如胃蛋
目標蛋白(target-proteins)粗提方法2
4)去垢劑去垢劑(表面活性劑)是一類即具有親水基又具有疏水基的物質,一般具有乳化、分散、和增溶作用,可分陰離子、陽離子和中性去垢劑等多種類型,中性去垢劑在蛋白提取鐘應用的較多。A.中性去垢劑 又稱非離子表面活性劑,對蛋白質的變性作用影響較少,宜于蛋白質或酶提取之用。一般市售中性去垢劑有聚乙二醇類
目標蛋白(target-proteins)粗提方法1
狹義來講,提取指制備物與細胞固體成分或其它結合成分的分離,由固相轉入液相或從細胞內生理狀態轉入外界特定溶液環境的過程,即分離前期被提取物從破碎的細胞中釋放出來的過程。如果被提取物程固相或與固體結合,提取時由固相轉入液相,常稱為固液萃取;如果被提取物已經呈液相存在,提取時由一液相轉入轉入另一互不相溶的
Isolation-of-Cell-Wall-Proteins-from-Medicago-sativa-Stems
Plant cell walls are highly dynamic and chemically active components of plant cells. Cell walls consist primarily of polysaccharides, with protein
Phosphoamino-acid-analysis-of-nonTCA-precipitable-proteins
Phosphoamino acid analysis of non-TCA precipitable proteins1. Cut out gel slice, incubate 60 min with 1 ml 5.7 M HCl @ 110oC in 13 x 100 mm screw cap
InGel-Digestion-of-Proteins-Separated-byPolyacrylamide-Gel-Electrophoresis
1. Excision of protein bands (spots) from polyacrylamide gelsRinse the gloves you use with water to avoid traces of dust in your sample.Rinse the gel
目標蛋白(target-proteins)粗提方法4
第四節 提取時的保護性措施提取一些具有生理活性的物質時,除了考慮被提取物溶解度外,還應考慮被提取物活性的保護。對于一些生物大分子如蛋白質、酶和核酸來說,主要措施有如下幾點;1.采用緩沖系統 防止提取過程中某些酸堿基團的解離,造成溶液中PH值變化幅度過大,導致某些活性物質的變性、或由于PH變化影響
Edman-Sequencing-of-Proteins-from-2D-Gels
The Western blotting/sequencing technique using polyvinylidene difluoride (PVDF) membrane is one of the most popular technique for Edman sequencin
重組人表皮細胞生長因子(recombinant-human-EGF)
生物學功能:人表皮細胞生長因子(hEGF)不僅對上皮細胞而且對許多類型細胞均有促增殖作用,是與細胞的生長及分化有關的重要生長因子。hEGF具有多種生物活性,主要表現在:①在體內刺激皮膚組織、角膜和氣管上皮組織的生長繁殖; ②加速角膜、皮膚等表皮創傷的修復; ③抑制胃酸分泌;④促進人皮膚上皮細胞、角膜