Ligation

Definition

Ligation is the process of joining two strands of DNA together using an enzyme called DNA ligase. It is essential in genetic engineering to insert a specific DNA fragment into a vector.

5 Must Know Facts For Your Next Test

1. Ligation requires ATP as an energy source for the enzyme DNA ligase.
2. DNA ligase forms phosphodiester bonds between adjacent nucleotides, sealing nicks in the DNA backbone.
3. Sticky-end ligation involves complementary overhangs that facilitate the joining of DNA fragments.
4. Blunt-end ligation is more challenging and less efficient than sticky-end ligation due to lack of overhangs.
5. Ligation efficiency can be increased by optimizing conditions such as temperature, buffer composition, and enzyme concentration.

Review Questions

Related terms

DNA Ligase:

An enzyme that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond.

Vector:

A vehicle used to transfer genetic material to a target cell, often a plasmid or virus.

Restriction Enzyme: An enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites.