Ncoi Restriction Enzyme, supplied by New England Biolabs, used in various techniques. Bioz Stars score: 96/100, based on 19 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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Average 96 stars, based on 19 article reviews
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1) Product Images from "Mechanism of Action of a Distal NF-?B-Dependent Enhancer"
Article Title: Mechanism of Action of a Distal NF-?B-Dependent Enhancer
Journal: Molecular and Cellular Biology
Figure Legend Snippet: An interaction between the distal and proximal regulatory regions of the MCP - 1 gene forms following TNF stimulation. (A) A schematic representation of the 3C assay and the architecture of the MCP - 1 promoter with cis regulatory sites with selected restriction sites and primer positions (P1 through P4) is shown. In the 3C assay, cells were fixed with formaldehyde and chromatin was isolated and digested with NcoI. Following inactivation of the restriction enzyme, the sample was diluted and subjected to DNA ligation such that only intramolecular ligations would be preferred. The cross-links were then reversed, and the DNA was purified. PCR primers P1 and P2 were used to detect the formation of the novel ligated 3C product. Primers P3 and P4 were used to verify that similar levels of MCP - 1 DNA were present in the assay and that the DNA was amplifiable. Products from the 3C assay were examined on agarose gels stained with ethidium bromide. (B) NIH 3T3 cells treated in the absence (−) (lanes 1 to 4) or presence (+) (lanes 5 to 8) of TNF for 2 h were processed in the above 3C assay with and without formaldehyde (CH 2 O) or DNA ligase, as indicated, to control for specificity of the protocol. M, DNA marker. (C) Purified mouse genomic DNA was processed in the 3C assay and demonstrates that the unique PCR product cannot form with naked DNA templates. (D) KpnI cleaves the PCR product generated by the 3C assay, producing the anticipated DNA fragments as shown on the agarose gel. (E) PCR amplification of the 3C product and the non-3C product display similar relative efficiencies. PCR products generated from undigested genomic DNA (1,207 bp) and DNA from a 3C assay (713 bp) were quantitated by fluorometry and used as templates in PCRs to determine if there were major differences in their PCR efficiency. DNA templates (40 pg, 8 pg, and 1.6 pg) were amplified by primers P1 and P2 under identical PCR conditions. (F) Chromatin isolated from TNF-treated or control cells fixed with formaldehyde was subjected to NcoI digestion as indicated. Following deproteination, the DNA was purified and analyzed by PCR using the indicated primers. Because the ligation step of the 3C assay was not performed, P1/P2, P1/P6, and P2/P5 PCR products can only be observed when NcoI was omitted from the reaction, indicating that the chromatin is accessible to restriction digestion even in the absence of TNF.
Techniques Used: Isolation, DNA Ligation, Purification, Polymerase Chain Reaction, Staining, Marker, Generated, Agarose Gel Electrophoresis, Amplification, Ligation