Lambda DNA (N6-methyladenine-free)
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- Lambda DNA is a commonly used cloning vector
- Isolated from a strain, this DNA can be digested with restriction endonucleases that are sensitive to methylation
Duplex DNA is isolated from bacteriophage lambda (cI857ind 1 Sam 7). The bacteriophage is grown in an E. coli host which is deficient in adenine methylase (dam-). Therefore, those deoxyadenosine positions which are methylated in a wild type E. coli host are not methylated in the dam- host. This DNA gives complete digests with restriction endonucleases that are sensitive to dam methylation. Lambda DNA (N6-methyladenine-free) is 48,502 base pairs in length.
SourceThe phage is isolated from a heat-inducible E. coli (dam-) lambda lysogen. The DNA is isolated from purified phage by phenol extraction and dialyzed against 10 mM Tris-HCl (pH 8.0) and 1 mM EDTA.
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