Isolation of specific tRNAs using an ionic-hydrophobic mixed-mode chromatographic matrix

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• High performance liquid chromatography (HPLC) is a key technique for biomolecule purification.
• Separating nucleic acids like transfer RNAs (tRNAs) requires specialized chromatographic materials.
• Existing methods may lack the resolution or efficiency for isolating specific tRNA isoacceptors.

Purpose of the Study:

• To develop a novel chromatographic matrix for high-resolution separation of oligonucleotides and tRNAs.
• To evaluate the purification efficiency of this new matrix for specific tRNA isolation.
• To demonstrate the utility of the matrix in a multi-step purification protocol.

Main Methods:

• Coating a C18-reversed-phase support (octadecylsilyl-Hypersil) with methyltrioctylammonium chloride.
• Utilizing the resulting dual-character (ionic and hydrophobic) matrix for chromatography.
• Applying the method to separate oligonucleotides and tRNAs from complex mixtures.
• Assessing purification efficiency and resolution.

Main Results:

• The novel matrix exhibits both ionic and hydrophobic properties, enhancing separation.
• High-resolution separation of oligonucleotides and tRNAs was achieved.
• Reduced diffusion processes contributed to the observed high resolution.
• Specific tRNAs were purified to high purity in a single chromatographic step.
• A two-step procedure facilitated the isolation of small quantities of specific tRNA isoacceptors.

Conclusions:

• The tetraalkylammonium salt-coated C18-reversed-phase HPLC matrix is effective for high-resolution separation of nucleic acids.
• This method offers an efficient approach for purifying specific tRNAs, even from complex mixtures.
• The matrix is particularly valuable as a final purification step for obtaining pure tRNA isoacceptors.