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In a ligation reaction, the speed of the reaction is determined by the concentration of the substrate. PEG in a ligation reaction is a complex hydrophobic molecule that takes up most of the space in the reactions crowding the aqueous DNA and ligase. The less space available for DNA and ligase makes the reaction much more efficient.

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12y ago
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6mo ago

Polyethylene glycol (PEG) in ligation buffer is used to promote the binding of DNA fragments by decreasing electrostatic repulsion between them. PEG helps to increase the efficiency of ligation reactions by bringing DNA fragments closer together and facilitating their joining by DNA ligase.

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Q: WHAT IS The role of peg in ligation buffer?
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