Investigating Halogen Bonds as Pairing Force in an Artificial DNA Base Pair

Area of Science:

• Synthetic biology
• Biochemistry
• Molecular biology

Background:

• Nucleic acid research has expanded with artificial base pairs for applications like labeling.
• Natural DNA relies on hydrogen bonding, driving development of similar artificial pairs.
• Unnatural base pairs using hydrophobic interactions can disrupt DNA structures.

Purpose of the Study:

• To design and synthesize a novel artificial base pair utilizing halogen bonding.
• To achieve orthogonality with natural DNA bases using a new interaction mechanism.
• To demonstrate enzymatic incorporation of the novel base pair into DNA.

Main Methods:

• Computational studies guided the design of the artificial base pair.
• Chemical synthesis of the novel unnatural base pair.
• Enzymatic incorporation using KlenTaq DNA polymerase and a modified nucleoside triphosphate.

Main Results:

• A new artificial base pair employing halogen bonding (R-Hal···) was developed.
• Computational studies supported the design of this novel base pair.
• KlenTaq DNA polymerase selectively incorporated an iodinated nucleoside triphosphate, forming the dIIPO-doIPP base pair in DNA.

Conclusions:

• This study presents the first artificial base pair using halogen bonding.
• The novel base pair is enzymatically incorporated into DNA, demonstrating its utility.
• This breakthrough expands the possibilities for DNA applications through novel base pairing mechanisms.