grade
Molecular Biology
form
liquid
usage
sufficient for 125 dishes (90 mm)
technique(s)
nucleic acid detection: suitable
suitability
suitable for nucleic acid staining
shipped in
dry ice
storage temp.
−20°C
Quality Level
General description
Sigma 蓝白 Select ™ 筛选试剂是 β-半乳糖苷酶 的显色底物,用于确定琼脂平板上生长的细菌中是否存在克隆的 DNA 插入片段。蓝白选择™筛选试剂设计用于选择具有 lac + 表型的蓝白色重组细菌菌落。
Biochem/physiol Actions
当 Blue-White Select ™ 筛查试剂被 β-半乳糖苷酶裂解时,所得产物会形成蓝色沉淀。存在 Lac + 菌落的情况下生长 Select ™ 筛选试剂保持白色,便于区分 lac + 和 lac-菌落。
该技术是基于载体的,如携带编码β-半乳糖苷酶 α-片段的 β-半乳糖苷酶基因的 pUC 和 M13mp 系列。开发这些载体需要使用携带互补基因片段的细菌菌株,以允许组装活性复合物,从而形成蓝色菌落。将 DNA 片段插入载体导致 β-半乳糖苷酶基因断裂 ′多克隆位点导致功能 β-半乳糖苷酶活性;这些菌落保持白色,便于区分 lac + 和 lac-菌落。
该技术是基于载体的,如携带编码β-半乳糖苷酶 α-片段的 β-半乳糖苷酶基因的 pUC 和 M13mp 系列。开发这些载体需要使用携带互补基因片段的细菌菌株,以允许组装活性复合物,从而形成蓝色菌落。将 DNA 片段插入载体导致 β-半乳糖苷酶基因断裂 ′多克隆位点导致功能 β-半乳糖苷酶活性;这些菌落保持白色,便于区分 lac + 和 lac-菌落。
Features and Benefits
- 强烈的颜色对比,便于菌落选择
- 便捷的即用型解决方案
Other Notes
40 mg/mL IPTG
40 mg/mL X-Gal
(在 DMSO 中制备)
40 mg/mL X-Gal
(在 DMSO 中制备)
Legal Information
Blue-White Select is a trademark of Sigma-Aldrich Co. LLC
存储类别
10 - Combustible liquids
wgk
WGK 3
flash_point_f
188.6 °F
flash_point_c
87 °C
ppe
Eyeshields, Gloves, type ABEK (EN14387) respirator filter
Characterization by in vitro complementation of a peptide corresponding to an operator-proximal segment of the beta-galactosidase structural gene of Escherichia coli.
A Ullmann et al.
Journal of molecular biology, 24(2), 339-343 (1967-03-14)
D S Biard et al.
Biochimica et biophysica acta, 1130(1), 68-74 (1992-02-28)
We have investigated the use of various Epstein-Barr virus (EBV)-based vectors bearing the two components of the Escherichia coli lac operator-repressor (lacO, lacI) complex. Our aim was to develop a model system of gene expression by looking at the transcription
Regulation of the Escherichia coli lac operon expressed in human cells.
Bioard, D.S. et al.
Biochimica et Biophysica Acta, 113, 68-74 (1992)
Methylation of single-stranded DNA in vitro introduces new restriction endonuclease cleavage sites.
B Gronenborn et al.
Nature, 272(5651), 375-377 (1978-03-23)
Ausubel, F.M., et al.
Current Protocols in Molecular Biology, 1-1 (1995)
实验方案
Blue/white color selection streamlines vector insert differentiation, enhancing cloning efficiency for molecular biologists.
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