Structural basis of dsRNA processing by Dicer

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For more information see Biochemistry Online: Chapter 5D - Binding and the Control of Gene Transcription

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II. General Structure

Wireframe

Note:  This tetrameric protein structure does not contain dsRNA.

Strands
Catalytic site

Note the GLU, ASP interaction with the Mn, and the internal heterodimer formed by the two RNaselll located in the head of each subunit.  

Individual chains:
Individual dicer subunits of the tetramer will appear with time.  Wait until all show.
Secondary Structure

Alpha Helicies & Beta Sheets.

Electrostatic map

Note the centralized positive charge density (blue) in the PAZ regions used for binding of dsRNA

Amino acids forming the 3' overhang-binding pockets

Located in the PAZ domain of the sub-units the highlighted Tyrosine, Phenylalanine, and Histidine play and important role in binding of dsRNA.