DNA unwinding assay using streptavidin-bound oligonucleotides

Area of Science:

• Molecular Biology
• Biochemistry

Background:

• Helicases are crucial enzymes involved in DNA replication, transcription, and translation.
• Helicases exhibit directionality, moving along nucleic acid strands in either the 3' to 5' or 5' to 3' direction.
• Determining the directionality of low-activity helicases or those with limited substrate initiation can be challenging.

Purpose of the Study:

• To develop an improved assay for determining helicase directionality.
• To enhance the accuracy and efficiency of helicase activity and directionality assays.

Main Methods:

• Development of a novel assay utilizing a substrate composed of biotinylated oligonucleotides.
• Proof-of-concept demonstration with several DNA helicases.
• Creation of a universal substrate applicable to both 3' to 5' and 5' to 3' helicases.

Main Results:

• The biotinylated oligonucleotide substrate significantly improved helicase activity and directionality determination compared to traditional substrates.
• The assay demonstrated enhanced performance for various DNA helicases.
• A universal substrate was successfully developed for assessing the directionality of diverse helicases.

Conclusions:

• The biotin-streptavidin complex-based helicase substrate enhances enzyme activity and simplifies directionality determination.
• This novel method offers a more straightforward approach compared to existing techniques for assessing helicase directionality.