Wojciech Strzałka
Jagiellonian University, Poland
Title: Implementation of ssDNA aptamers for imidazole-free purification of His3-tagged recombinant proteins
Biography
Biography: Wojciech Strzałka
Abstract
The dynamic development of genetic engineering has opened new perspectives for the production of recombinant proteins which are currently offered by many biotech companies. In addition to the medical and industrial applications they are also extensively used in basic research studies. Recombinant proteins are often produced in heterologous expression systems, for example in E. coli cells. Before proteins find a final application, purification, a key stage of the production process, must be performed. Therefore affinity chromatography systems were developed for the fast and simple isolation of recombinant proteins. One of such systems is Immobilized Metal Ion Affinity Chromatography (IMAC), which is commonly used for the purification of His6-tagged recombinant proteins. Although it is a powerful system it is not free of disadvantages. Recently an alternative solution, which is free of IMAC drawbacks, was developed. It is based on a unique ssDNA sequence, called the H3T aptamer, which was selected for the purification of His3-tagged recombinant proteins. The binding of the H3T aptamer to His3-tag is controlled by sodium ion concentration. Based on this feature H3T aptamer resins can be successfully employed for the purification of His3-tagged recombinant proteins from E. coli total protein extracts using imidazole-free buffers. The purity of His3-tagged proteins is superior when purified with the help of the H3T aptamer in comparison with IMAC resins.