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Lambda Phage DNA, Non-methylated from Escherichia coli host strain GM119 (rm-,dam-,dcm-)

品牌
Sigma-Aldrich
CAS
91080-14-7
货号
D3654
规格纯度
solution
参考价格
2413.82 *本价格含增值税费
促销
数量
-+
产品介绍:

产品说明

特异性

Unique Restriction Sites (Methylated DNA) are: Apa I,Nae I, Nar I, Nhe I, PaeR7 I, SnaB I, Xba I and Xho I.

应用

Lambda Phage DNA, Non-methylated from Escherichia coli host strain GM119 (rm-,dam-,dcm-) has been used:

  • to calibrate spectrophotometer (LKB) and HPLC (high performance liquid chromatography) method for determination of bacterial genomic DNA G+C content
  • to amplify the λ; exonuclease gene by polymerase chain reaction (PCR)
  • in DNase activities

Lambda Phage DNA, Non-methylated from Escherichia coli host strain GM119 is suitable for use as a substrate for restriction enzymes. It was used as substrate for Prevotella ruminicola DNase activity studies. It was also used as a GC content standard in genome sequencing of 16S rDNA sequences of Cellvibrio japonicas.
The lambda phage has an icosahedral head and a long tail terminating in a single fiber. At both ends of the 5′ termini are complementary 12-nucleotide single strand sequences that contribute to the cohesive ends (cos region) of the DNA. The tail of the phage latches on the host outer membrane receptor and injects phage DNA into the cell. The phage converts the E. coli to a lysogenic state in which the phage functions are repressed and the phage genome may remain dormant (prophage) for a long time. This property is seen in bacteriophages that carry CII and CIII genes that are responsible for CI expression. Bacteriophages with CI mutation in the CI gene are able to maintain a lysogenic state at defined temperatures.
Infecting E. coli strain GM 119 with lambda C1857 strain creates E. coli lysogen cultures. The phage is released from E. coli cell pellets by lysing with a high salt buffer, pH 8.0. The crude mixture is passed through a series of enzymatic steps, multiple cesium gradients, and phage DNA is dialyzed against 1 mM Tris-HCl, pH 8.0, and 1 mM magnesium chloride. The DNA is finally extracted by phenol-chloroform solution.

外形

Phage DNA is isolated from infected E. coli, passed through a series of enzymatic steps before final phenol-chloroform extraction. This non-methylated lambda DNA is completely digested by Bcl I, Cla I, Mbo I, Mbo II, Taq I or Xba I whereas methylated lambda DNA(product number D3779) is only partially cleaved. The unique restriction sites are Apa I,Nae I, Nar I, Nhe I, PaeR7 I, SnaB I, Xba I and Xho I.

底物

Non-methylated lambda DNA is completely digested by Bcl I, Cla I, Mbo I, Mbo II, Taq I or Xba I whereas methylated lambda DNA is only partially cleaved.

基本信息

MDL编号MFCD00146648
eCl@ss32160414
NACRESNA.52

产品性质

质量水平200
等级for molecular biology
形式solution
分子量 31.5 × 103 kDa
48 kb
适用性suitable for substrate for restriction endonucleases
运输dry ice
储存温度−20℃

安全信息

储存分类代码12 - Non Combustible Liquids
WGKWGK 2
闪点(F)Not applicable
闪点(C)Not applicable
个人防护装备Eyeshields, Gloves, type ABEK (EN14387) respirator filter

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