Fortran

S1 Nuclease It is an endonuclease, which cleaves single-stranded DNA or single-strand protrusion of double-stranded DNA with cohesive ends. Because of S1 nuclease action, cohesive ends are converted into blunt ends. Thus, S1 nuclease is used to remove the incompatible ends. DNA Pol-I, Klenow fragment This fragment has the polymerase activity and 3′ → 5′ […]

S1 Nuclease It is an endonuclease, which cleaves single-stranded DNA or single-strand protrusion of double-stranded DNA with cohesive ends. Because of S1 nuclease action, cohesive ends are converted into blunt ends. Thus, S1 nuclease is used to remove the incompatible ends. DNA Pol-I, Klenow fragment This fragment has the polymerase activity and 3′ → 5′ […]

The blunt ends created using the action of restriction enzymes can be ligated with a similar blunt created in vectors by using:   Figure 9.7 Recombinant DNA production by sticky end ligation T4 DNA ligase Blunt ends can be ligated using E. coli and phage DNA ligases, which seals single-stranded nicks between adjacent nucleotides in a duplex DNA chain. […]

Both the target DNA and the vector such as plasmid DNA can be cut by the same restriction enzyme, so that they produce complementary staggered ends, which are annealed together to get the rDNA (Figure 9.7).

The term restriction endonuclease was coined by Lederberg and Meselson in 1964 to describe the nuclease enzyme that destroys or restricts any foreign DNA entering a bacterial cell. These restriction endonucleases are widely used in rDNA technology. They specifically bind to double-stranded DNA and cleave it at specific sites known as recognition sequence or restriction […]

The basic tools of rDNA technology include various:

The first step in the rDNA technology is the isolation of the desired gene of interest for which the DNA from the cell has been isolated. DNA Isolation DNA can be isolated by employing gentle methods of cell rupture. Cell walls if present are digested enzymatically (lysozyme treatment) and the cell membrane is solubilized using […]

Recombinant DNA (rDNA) technology deals with the isolation and manipulation of DNA. DNA molecules from all organisms share the same chemical structure; they differ only in the sequence of nucleotides, consequently, a DNA from a foreign source can be linked to host DNA sequences, i.e., the DNAs of two different species can be linked to […]