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Structural basis for RNA 3'-end recognition by the PIWIL2 PAZ domain
Qianqian Li1, Aiping Dong2, Zhongliang Zhu1
1MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China.
Biochemical and Biophysical Research Communications
|March 28, 2021
Summary
The PIWI protein PIWIL2
Area of Science:
- Molecular Biology
- Structural Biology
- Genetics
Background:
- PIWI proteins are crucial Argonaute family members involved in spermatogenesis and development.
- PIWI proteins bind piRNAs to perform their functions.
Purpose of the Study:
- To determine the crystal structure of the human PIWIL2 PAZ domain.
- To investigate the binding mechanism of PIWIL2 to target RNAs.
Main Methods:
- X-ray crystallography to solve the PIWIL2 PAZ domain structure.
- Homology modeling to create a PIWIL2-RNA complex model.
Main Results:
- The PIWIL2 PAZ domain exhibits a canonical PAZ fold.
- PIWIL2 recognizes 2-nucleotide 3' RNA overhangs via a hydrophobic pocket.
- This RNA binding mode is conserved across human PIWIL proteins.
Conclusions:
- The PAZ domain's role in target RNA binding is evolutionarily conserved among PIWI proteins.
- Structural insights into PIWIL2-RNA interaction provide a basis for understanding PIWI protein function.
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