BOC Sciences offers a PNA monomer synthesis service that can be customized to meet the specific needs of our clients, including the choice of nucleobases, protecting groups, and linkers. With our expertise in synthetic chemistry and nucleic acid analogs, we are committed to providing high-quality PNA monomers to support the development of innovative applications in the field of nucleic acid research.

What are PNA Monomers?

Peptide nucleic acid synthesis are nucleic acid analogs that have attracted much attention due to their unique properties, such as high binding affinity and specificity to complementary DNA and RNA strands, and resistance to nuclease degradation. PNA monomers are the building blocks used for the synthesis of PNA oligomers. They consist of a pseudopeptide backbone composed of N-(2-aminoethyl)glycine units and nucleobase moieties, such as adenine, cytosine, guanine, thymine, or uracil, attached to the backbone through a methylene carbonyl linker. The backbone is achiral and neutral, which allows for high binding affinity and specificity to complementary DNA and RNA strands.

Synthesis of PNA Monomers

At BOC Sciences, we offer a comprehensive PNA monomer synthesis service:

• Protection of the amino and nucleobase functional groups

The amino and nucleobase functionalities are protected using appropriate protecting groups to prevent unwanted reactions during the synthesis. For example, the amino of the N-(2-aminoethyl)glycine unit can be protected using the tert-butyloxycarbonyl (Boc) or the 9-fluorenylmethyloxycarbonyl (Fmoc) group. The nucleobase can be protected using the dimethoxytrityl (DMT) or the benzoyl (Bz) group.

• Activation of the carboxylic acid

In the synthesis of PNA monomers, the carboxylic acid is typically activated using a coupling reagent, such as N, N'-diisopropylcarbodiimide (DIC) or N ,N'-dicyclohexylcarbodiimide (DCC), in the presence of a catalyst (DMAP or N-methylimidazole).

• Coupling of the nucleobase to the activated carboxylic acid

The coupling of the nucleobase to the activated carboxylic acid is typically achieved using standard peptide coupling reactions, such as amidation or esterification. The reaction conditions depend on the specific nucleobase and protecting group used in the synthesis. For example, coupling reactions can be carried out in a dimethylformamide (DMF) solution under alkaline conditions with the addition of triethylamine (TEA).

• Deprotection of the amino and nucleobase functional groups

The deprotection strategy depends on the specific protecting groups used in the synthesis. For example, the commonly used Fmoc protecting group on the amino group can be removed using a solution of piperidine in DMF. The DMT or Bz protecting groups on the nucleobase can be removed using an acid such as TCA (trichloroacetic acid) or TFA (trifluoroacetic acid), respectively.

Applications of PNA Monomers

PNA monomers can be used for the synthesis of PNA oligomers, which have a wide range of applications, including:

• Gene expression modulation: PNAs can be designed to bind to specific DNA or RNA sequences and inhibit or enhance gene expression, making them a valuable tool for gene therapy and drug discovery.
• Diagnostics: PNAs can be used as probes for the detection of specific DNA or RNA sequences in diagnostic assays, such as polymerase chain reaction (PCR) and fluorescence in situ hybridization (FISH).
• Therapeutics: PNAs can be used as therapeutics for the treatment of various diseases, such as cancer and viral infections, by targeting specific DNA or RNA sequences involved in disease progression.