高特异性扩增,所需优化次数少

  • 所需优化次数少
  • PCR特异性高
  • 操作方便,可在室温下构建反应体系
不同于抗体介导的方法,HotStarTaq DNA Polymerase应用化学介导的热启动,可确保聚合酶在PCR初始加热阶段完全没有活性。HotStarTaq DNA Polymerase提供独特的QIAGEN PCR Buffer,将非特异性扩增产物、引物二聚体和其他污染降至最低。一种新型的添加剂Q-Solution,可实现难扩增的模板(如GC含量高的模板)高效扩增。
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HotStarTaq DNA Polymerase (250 U)
250 units HotStarTaq DNA Polymerase, 10x PCR Buffer, 5x Q-Solution, 25 mM MgCl2
203203
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HotStarTaq DNA Polymerase (1000 U)
4 x 250 units HotStarTaq DNA Polymerase, 10x PCR Buffer, 5x Q-Solution, 25 mM MgCl2
203205
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HotStarTaq DNA Polymerase (5000 U)
1 x 5000 units HotStarTaq DNA Polymerase, 1 x HotStarTaq Buffer Set (1 x 22 ml PCR Buffer, 1 x 40 ml Q-Solution, 1 x 22 ml MgCl2)
203207
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HotStarTaq DNA Polymerase (25000)
100 x 250 units HotStarTaq DNA Polymerase, 100 x 1.2 ml HotStarTaq Buffer Set, 100 x 2.0 ml Q-Solution, 100 x 1.2 ml MgCl2
203209
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The HotStarTaq DNA Polymerase is intended for molecular biology applications. This product is not intended for the diagnosis, prevention, or treatment of a disease.
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HotStarTaq procedure.|Superior performance.|Amplification of difficult templates.|Higher specificity with different primer–template systems.|Effect of hot start on RT-PCR performance.|Highly sensitive single-cell PCR.|Tolerance to variable temperature and magnesium concentrations.|Increased specificity of primer annealing.|
The HotStarTaq procedure is fast and easy for maximum convenience.|A 497 bp fragment was amplified from 50 copies of an HIV-pol-gene construct which had been added to 1 µg human genomic DNA. Different hot-start enzymes were employed: HotStarTaq DNA Polymerase from QIAGEN (HotStarTaq); hot-start enzyme from Supplier AII (Hot-start enzyme); Taq-antibody mixture from Supplier L (Antibody-mediated); enzyme without hot start from Supplier R (No hot start). Specific PCR product is indicated by the arrow. Equal volumes of the reaction were analyzed on a 2% agarose gel. M: markers.|Two different primer–template systems were amplified in duplicate using QIAGEN PCR Buffer and Taq DNA Polymerase in the absence () or presence (+) of 1x Q-Solution. Q-Solution enables specific amplification of difficult templates. [A] human angiotensin receptor II gene; [B] mouse protein kinase C gene; M: markers.|Three different primer–template systems were amplified under the same conditions with either Taq DNA polymerase from Supplier R (R) or with HotStarTaq DNA Polymerase (H). System 1: A 1.1 kb fragment of a D-IgI homolog was amplified from human genomic DNA. System 2: A 296 bp fragment from the chromosomal region correlated with X-linked juvenile retinoschisis was amplified from human genomic DNA. System 3: A 214 bp fragment of the β-actin gene was amplified from cDNA synthesized from total RNA. M: markers.|A 1.1 kb fragment of the human interleukin 1 receptor (type II) gene was amplified from cDNA. Amplification reactions were prepared in triplicate using Taq DNA polymerase and buffer from Supplier L(No hot start); antibody-mediated hot start using enzyme and buffer from Supplier L (Antibody-mediated); and HotStarTaq DNA Polymerase and PCR Buffer from QIAGEN (HotStarTaq). M: markers.|A 500 bp fragment of the murine p53 gene was amplified from single cells isolated by flow cytometry, and directly sorted into individual PCR tubes. Reactions were prepared in parallel using HotStarTaq DNA Polymerase and PCR Buffer from QIAGEN (HotStarTaq), a hot-start enzyme and buffer from Supplier AII (Hot-start enzyme), or antibody-mediated hot start and buffer from Supplier L (Antibody-mediated). M: markers.|[A] PCR amplification at the indicated annealing temperatures using QIAGEN PCR Buffer and Taq DNA Polymerase (QIAGEN). The same PCR was performed in parallel using PCR buffer and Taq DNA polymerase from another supplier (Supplier AII). The single-copy human cystic fibrosis gene was amplified. M: markers. [B] Tolerance to Variable Magnesium Concentration. PCR amplification at the indicated Mg2+ concentrations using QIAGEN PCR Buffer and Taq DNA Polymerase (QIAGEN). The same PCR was performed in parallel using PCR buffer and Taq DNA polymerase from another supplier (Supplier AII). The single-copy human prion protein gene was amplified. M: markers.|Ammonium and potassium cations in QIAGEN PCR Buffers increase specificity of primer annealing. K+ binds to the phosphate groups (P) on the DNA backbone, stabilizing the annealing of the primers to the template. NH4+, which exists both as the ammonium ion and as ammonia under thermal-cycling conditions, can interact with the hydrogen bonds between the bases (B), destabilizing the weak hydrogen bonds at mismatched bases. The combined effect of the two cations maintains a high ratio of specific-to-nonspecific primer-template binding over a wide temperature range.|
Performance

每一批HotStarTaq DNA Polymerase都经过全方位的质量控制测试,包括:严格的PCR特异性和具有可重复性的试剂,即使低拷贝的靶分子也可扩增。通过检测,HotStarTaq DNA Polymerase可确保高度特异性和在热启动PCR中的卓越表现(参见"Higher specificity with different primer–template systems"、"Superior performance"和表格)。该试剂盒提供的新型PCR缓冲液使得在多种PCR条件下都维持高特异性,无需优化(参见"Tolerance to variable magnesium concentration")。试剂盒中的Q-Solution可进一步优化PCR(参见"Amplification of difficult templates")。总之,这些组合确保了在多种应用中的特异性扩增(参见"Effect of hot start on RT-PCR performance"和"Highly sensitive single-cell PCR")。

热启动模式比较
HotStarTaq DNA Polymerase Supplier AII提供的热启动酶 抗体介导 手动 蜡屏障
特异性扩增 ++ + + +/– +/–
PCR优化需求 ++ +/– +/–
易用性 ++ ++ +
HotStarTaq DNA Polymerase特性

浓度:5 units/µl
重组酶:
底物类似物:dNTP、ddNTP、dUTP、biotin-11-dUTP、DIG-11-dUTP、fluorescent-dNTP/ddNTP
延伸速度:72°C条件下2–4 kb/min
酶半衰期:97°C条件下10 min,94°C条件下60 min
扩增效率:≥105
5'–>3'外切酶活性:
额外添加A:
3'–>5' 外切酶活性:
核酸酶污染:
蛋白酶污染:
RNases污染:
自启活性:否  

Principle

HotStarTaq DNA Polymerase,一种经修饰的Taq DNA Polymerase,确保热启动PCR的高度特异性。该试剂盒包括新型的双阳离子PCR缓冲液、Q-Solution和MgCl2

HotStarTaq DNA Polymerase

HotStarTaq DNA Polymerase以非活性形式提供,常温下没有聚合酶活性。避免PCR构建和循环初始阶段低温条件下非特异性引物的延伸和引物二聚体的形成(参见"Superior performance in hot-start PCR"和"Higher specificity with different primer–template systems")。95°C条件下孵育15分钟即可激活HotStarTaq DNA Polymerase,这个步骤可整合入已有的热循环程序中。

QIAGEN PCR Buffer

QIAGEN PCR Buffer通过提高每个PCR扩增退火过程特异性引物的结合比例,确保PCR每个循环特异性扩增(参见"Increased specificity of primer annealing")。独特的KCl和(NH4)2SO4平衡组合,使得该缓冲液与传统的PCR缓冲液相比在很宽的温度和Mg2+浓度范围内都有严格的引物退火条件和高度的特异性,无需进行耗时的优化(参见"Tolerance to variable magnesium concentration")。

Q-Solution

该产品同时提供Q-Solution,一种新型的PCR添加剂,通过更改DNA熔解行为促进难扩增模板的扩增。这种独特的试剂可进一步优化由模板引起的表现不理想的PCR,如过多的二级结构和富含GC的模板(参见"Amplification of difficult templates")。不同于DMSO和其他PCR添加剂,Q-Solution的浓度是确定的,没有毒性,并且保证PCR的纯度。而且PCR中加入Q-Solution不会影响PCR的准确性。

Procedure
HotStarTaq DNA Polymerase提供高效、经优化的实验方案,用于快速、方便的构建PCR反应体系。95°C条件下孵育15分钟激活HotStarTaq DNA Polymerase,可以整合入已有的热循环程序。反应可在室温下建立,更加方便和易于使用(参见"HotStarTaq procedure")。
Applications

HotStarTaq DNA Polymerase适合多种应用,包括各种富有挑战性的研究,如各种扩增应用:

  • 复杂的基因模板
  • 复杂的cDNA模板(如RT-PCR)
  • 低拷贝的靶序列(如单细胞PCR)
  • 多重引物对反应
Feature
Specifications
Applications PCR, RT-PCR, Complex genomic templates, very low-copy targets
Enzyme activity 5' -> 3' exonuclease activity
Mastermix No
Reaction type PCR amplification
Real-time or endpoint Endpoint
Sample/target type Genomic DNA and cDNA
Single or multiplex Single
With/without hotstart With hotstart

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Kit Handbooks
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HotStarTaq DNA Polymerase; HotStarTaq Master Mix Kit - For highly specific hot-start PCR without optimization  
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