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General information
Champion™ Competent Cells are chemically competent cells, which were prepared by SMOBIO to make E. coli perform excellent transformation efficiency. Standard transformation protocol is recommended for large plasmids or non-ampicillin selection. Time-saving transformation protocol is recommended for simple and rapid transformation. Champion™ Competent Cells are one of the fastest and simplest ready-to-use competent cell products in the world.
Kit contents
Champion™ Competent Cells
pUC19 Control Plasmid (5 μl, 10-4 μg/μl)
Champion™ Transformation Protocol Card
Shipping condition
Throughout the shipping process, the temperature is maintained under -70°C.
Storage and expiration
Champion™ Competent Cells must be stored between -70°C to -80°C. Subsequent freeze-thaw cycles will reduce transformation efficiency. If high efficiency is required for the experiment, do not use aliquots that have gone through several freeze-thaw cycles. The efficiency of Champion™ Competent Cells lasts for 1 year with proper storage.
Genotypes and applications
Product Name | Genotype | Application |
Champion™ 109 High | e14(McrA-)recA1 endA1 gyrA96 hsdR17(rk-, mK+) phoA supE44 thi-1 relA1 ∆(lac-proAB) (F’traD36 proAB lacIqZ∆M15 | Appropriate for blue-white color and robotic screening. It is a fast growing strain forming visible colonies within 8~10 hours. |
Champion™ 21 | F’ ompT hsdSβ(rβ-mβ-) dcm gal λ (DE3) | Appropriate host for recombinant protein expression using T7-based expression vectors. |
Champion™ DH5α High | recA1 endA1 gyrA96 hsdR17(rk-, mK+) phoA supE44 relA1 thi-1 ∆(lacZYA-argF)U 169 φ80 ∆(lacZ)M15 F’ | Suitable for cloning with large plasmid and cDNA library construction, and also for blue-white colony selection. |
Items and ordering information
Product Name | Compatible to E. coli strain | Efficiency (cfu/μg) | Quantity | Cat. No. |
Champion™ 109 High | E. coli JM109 | >1 x 108 | 100 μl x 80 vials | CC0202 |
100 μl x 24 vials | CC0204 | |||
Champion™ 21 | E. coli BL21 (DE3) | >1 x 107 | 100 μl x 80 vials | CC2102 |
100 μl x 24 vials | CC2104 | |||
Champion™ DH5α High | E. coli DH5α | >3 x 108 | 100 μl x 80 vials | CC5202 |
100 μl x 24 vials | CC5204 |
Manual
Manual_Champion™ Competent Cell
SDS
SDS_Champion™ Competent Cell
Flyer
Champion™ Competent Cell
Protocol card
Will transformation efficiency be reduced when Champion™ competent cells are thawed, dispensed and refrozen repeatedly?
When Champion™ competent cells are thawed dispensed in aliquots and refrozen within 1 min, the transformation efficiency will be 10~20% reduced compared to the first time use.
What is the advantage of thawing competent cells with circulating water instead of still water?
Using circulating water can reduce the thawing time. Less thawing time shows higher efficiency than long thawing time.
Is there any difference of transformation efficiency between using plating beads, bending glass rod and plating loop?
The bending glass rod shows best efficiency and the plating loop show less efficiency than other method. For handle a lot samples at the same time the plating beads are recommended.
Is 1 second vortex critical for mixture the DNA?
One second vortex provides more reliable transformation efficiency (1.1 times compare with mixed by finger tapping)
Will heat shock affect the transformation efficiency?
Heat shock treatment will enhance the efficiency about 1~2X versus non-heat shock method.
Factors Affecting Transformation Efficiency
Thawing methods
Shorter thawing time is more efficient than a longer thawing time. Slow thawing caused by power shortages and unstable freezers will result in decreased efficiency.
Size of plasmid
Plasmid size affect the efficiency greatly. The efficiency of transforming a supercoiled 2.7 kb is approximately 100 times higher than that of a 10 Kb plasmid (using time-saving transformation protocol). For large plasmids (> 6 kb), standard transformation protocol is recommended.
Heat shock treatment
Heat shock treatment will enhance the efficiency about 1~2 folds versus non-heat shock method.
Plating methods
Bent glass rods show the greatest efficiency, while plating loop shows less efficiency than plating beads. When handling a large quantity of samples at the same time, plating beads are recommended.
Concentration of antibiotic
Antibiotic concentration is critical to use of the time-saving transformation protocol.
Antibiotic | Concentration |
Ampicillin (Ap) | 20 μg/ml |
Kanamycin (Km) | 25 μg/ml |
Tetracycline (Tc) | 7.5 μg/ml |
Chloramphenicol (Cm) | 20 μg/ml |
For plasmid size <6 Kb, the efficiency of kanamycin selection is usually 3~10 times less than the ampicillin selection. For plasmid size > 6 Kb, the efficiency of kanamycin selection is much lower than ampicillin. We suggest using the standard transformation protocol (with heat shock and recovery steps) to enhance the efficiency.
Product Name | Compatible to E. coli strain | Efficiency (cfu/μg) | Quantity | Cat. No. |
Champion™ 109 High | E. coli JM109 | >1 x 108 | 100 μl x 80 vials | CC0202 |
100 μl x 24 vials | CC0204 | |||
Champion™ 21 | E. coli BL21 (DE3) | >1 x 107 | 100 μl x 80 vials | CC2102 |
100 μl x 24 vials | CC2104 | |||
Champion™ DH5α High | E. coli DH5α | >3 x 108 | 100 μl x 80 vials | CC5202 |
100 μl x 24 vials | CC5204 |
High Fidelity PCR amplification
Amplification of target gene with HiFi™ DNA polymerase to minimize error rate.
[TF1000] SMO-HiFi™ DNA Polymerase, (1 U/μl, 100 U)
[TF3000] G-HiFi™ DNA Polymerase, (1 U/μl, 100 U)
Gel electrophoresis
Staining amplicons with safe fluorescent dyes, following by observation under blue-light illuminator to minimize damage of DNA amplicons and maximize successful cloning efficiency.
Safe fluorescent dyes
[NS1000] FluoroVue™ Nucleic Acid Gel Stain (10,000X), 500 μl
[DS1000] FluoroStain™ DNA Fluorescent Staining Dye (Green, 10,000X), 500 μl
[DL5000] FluoroDye™ DNA Fluorescent Loading Dye (Green, 6X), 1 ml
Blue-light illuminator
[VE0100] B-BOX™ Blue Light LED Epi-illuminator
Ligation
Blund-end PCR amplicons can directly ligate with PCR cloning vector.
[CV1000] GetClone™ PCR Cloning Vector, 20 Rxn
[CV1100] GetClone™ PCR Cloning Vector II, 20 Rxn
Colony PCR
Analyze colonies with PCR master mix to save preparation time.
[TP1100] ExcelTaq™ 5X PCR Master Mix, 200 Rxn
[TP1200] ExcelTaq™ 5X PCR Master Dye Mix, 200 Rxn
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Epicentre（Illumina旗公司）MasterPure™ Complete DNA Purification Kit采用种专利盐沉淀系列试剂盒覆盖各种品类型包括血液、固定组织、植物、酵母、昆虫等短短30钟内带高产量核酸损失极少
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经典硅胶膜
QIAGEN核酸纯化试剂盒依赖DNA与纯化柱硅胶膜结合抑制剂洗掉完整DNA随柱洗脱产量高纯度高带更高质量新代测序文库
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离液盐
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建议：做肝功能检查再结合肝功能情况遵医嘱进行抗病毒治疗
GenomeWalkerTM Universal Kit价格多少，哪里有卖的？
白细胞介素10（IL-10）是一种由多种细胞亚群产生的重要免疫调节因子。
早期研究显示，其主要生物功能为限制炎症反应及调节多种免疫细胞的分化和增殖，例如：T细胞、B细胞、NK细胞、
抗原呈递细胞、肥大细胞、粒细胞等。近来研究结果提示，IL-10也可以介导免疫反应的激活，有助于清除感染及非感染
颗粒且只产生轻微的炎症反应。大量的研究，包括患者IL-10的表达分析、体外实验及动物实验表明，IL-10与自身免疫
性疾病、炎症、肿瘤等疾病的发生、发展关系密切。临床试验主要集中于RA、炎症性肠病、银屑病、器官移植和丙型肝
炎等。虽然试验结果各不相同，但是使我们对IL-10在免疫反应中的作用的认识更加深入，同时也预示IL-10可以成为一
种治疗药物。目前，我国还没有重组基因工程IL-10药物上市，而且在探索如何高效表达具有生物活性rhIL-10的研究尚
处于起步阶段。本研究建立在国内外IL-10重组基因工程研究基础上，拟克隆人IL-10基因，通过原核、真核两种表达系
统表达IL-10蛋白，奠定重组基因工程研制人IL-10的基础。主要研究结果如下：一、依据Genbank中人类IL-10序列设计
一对特异性引物，应用RT-PCR技术，从LPS刺激的外周血单个核细胞中成功地克隆出hIL-10成熟肽编码序列，并将之克
隆入pGEM-T载体，构建出中间载体<WP=91>pGEM-T-hIL-10，转化入大肠杆菌JM109中，经酶切鉴定及序列测定与
分析，与GenBank中发表的（NM000572.2）hIL-10成熟肽编码序列完全一致。为hIL-10基因的表达研究奠定了基
础。二、从中间载体pGEM-T-hIL-10中将hIL-10成熟肽编码序列酶切回收，定向克隆至原核表达载体pET-28a(+)的T7
启动子下游，成功地构建了原核表达载体pET-28a(+)-hIL-10，将表达载体转化入大肠杆菌BL21(DE3)pLyss中获得表达
菌株，经IPTG的诱导获得较高表达，表达蛋白以包涵体形式存在。经薄层扫描确定目的蛋白表达量占菌体总蛋白的
28.7%。Westernblotting分析结果显示，表达产物与抗hIL-10单克隆抗体呈特异性阳性反应。产物经固相金属离子亲
和层析方法初步纯化，并在柱上应用浓度递减的尿素缓冲液对产物进行复性。活性研究结果表明，复性产物具有抑制
LPS刺激的外周血单核细胞表达MHCⅡ分子的活性。三、为了进一步获得高活性、高表达、适用于产业化生产的rhIL-
10，本研究选择应用酵母表达系统对hIL-10进行表达。应用PCR方法从pGEM-T-hIL-10扩增出hIL-10成熟肽编码序
列，并在其上下游分别引入EcoRI和BaxⅠ两个酶切位点，通过定向克隆成功地构建出分泌型酵母表达载体pPICZαA-
rhIL-10。采用电穿孔技术将表达单位转化入酵母菌P.pastorisX-33中，通过提取酵母基因组进行PCR鉴定以及
MD/MM营养表型筛选，初步筛选出10株可表达具有hIL-10活性的酵母菌。小量发酵培养表达菌株，以0.5%甲醇诱导
96小时，培养上清中蛋白经硫酸铵沉淀后，经SDS-PAGE、薄层扫描显示rhIL-10约占样品蛋白总量的10%。产物经固
相金属离子亲和层析方法初步纯化，纯度达94%。活性研究结果显示酵母表达的分泌型rhIL-10具有较原核表达产物更高
的活性。
量水用精细般瓶装乙醚即
