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Updated: Jun 19, 2026

Novel RNA-Binding Proteins Isolation by the RaPID Methodology
Published on: September 30, 2016
Structural basis for overhang-specific small interfering RNA recognition by the PAZ domain
Jin-Biao Ma1, Keqiong Ye1, Dinshaw J Patel1
1Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York 10021, USA.
Small interfering RNA (siRNA) end-binding by the PAZ domain is crucial for RNA silencing. This structural study reveals how PAZ anchors siRNA duplexes, facilitating gene silencing pathways.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- Short RNAs regulate gene silencing, impacting virus resistance and development.
- RNA silencing involves small interfering RNA (siRNA) processed by Dicer.
- Argonaute proteins bind siRNA to form silencing complexes.
Purpose of the Study:
- Determine the crystal structure of the human Argonaute PAZ domain bound to siRNA.
- Elucidate the mechanism of siRNA binding by the PAZ domain.
Main Methods:
- X-ray crystallography (2.6 A resolution)
- Biochemical binding assays
Main Results:
- The PAZ domain binds a 9-mer siRNA-like duplex in a sequence-independent manner.
- PAZ anchors the 2-nucleotide 3' overhang and binds the phosphodiester backbone.
- The PAZ domain caps the 5'-terminal residue of the complementary strand.
Conclusions:
- PAZ acts as an siRNA-end-binding module for transfer in RNA silencing.
- PAZ anchors guide RNA 3' ends within silencing effector complexes.
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