Related Experiment Video
Updated: Apr 16, 2026
10:36
Purification of Native Complexes for Structural Study Using a Tandem Affinity Tag Method
Published on: July 27, 2016
10.1K
A purification method for a molecular complex in which a scaffold molecule is fully loaded with heterogeneous
Shoji J Ohuchi1, Fumihiko Sagawa1, Hirohisa Ohno1
1Laboratory of Gene Biodynamics, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
Plos One
|March 18, 2015
Summary
This study introduces a novel sequential elimination method for purifying complex RNA-protein complexes (RNPs). This technique effectively isolates fully assembled RNPs, improving their performance compared to unpurified samples.
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- Affinity resin pull-down is a common method for purifying biomolecules.
- Isolating multi-component molecular complexes with standard methods is challenging due to starting materials and intermediates.
Purpose of the Study:
- To develop an improved purification procedure for multi-component molecular complexes.
- To successfully purify a triangular-shaped RNA-protein complex (RNP).
Main Methods:
- Developed a sequential elimination purification procedure using two distinct affinity resins.
- Utilized immobilized L7Ae protein to capture incomplete RNP complexes and free RNA scaffold.
- Employed a chemically modified RNA resin to capture free proteins.
Main Results:
- Successfully purified a complete triangular RNP complex consisting of three L7Ae ribosomal proteins and an RNA scaffold.
- The purified RNP complex demonstrated enhanced performance compared to the unpurified product.
- The purification strategy effectively removed starting materials and intermediate products.
Conclusions:
- The sequential elimination method is effective for purifying complex, multi-component molecular assemblies like RNPs.
- This procedure offers a versatile approach applicable to various multi-component complexes beyond RNPs.
- The developed method overcomes limitations of traditional affinity pull-down techniques for complex isolation.
