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Low-resolution models for ribosomal particles reconstructed from electron micrographs of tilted two-dimensional
Z Berkovitch-Yellin1, H G Wittmann, A Yonath
1Department of Structural Chemistry, Weizmann Institute of Science, Rehovot, Israel.
Acta Crystallographica. Section B, Structural Science
|October 1, 1990
Summary
Low-resolution models of the whole ribosome and its large subunit were generated using 3D image reconstruction. This revealed the small subunit
Area of Science:
- Structural biology
- Molecular biology
- Biophysics
Background:
- The ribosome is a crucial molecular machine responsible for protein synthesis.
- Understanding its structure is key to deciphering its function in cellular processes.
Purpose of the Study:
- To generate low-resolution three-dimensional models of the whole ribosome (70S) and its large subunit (50S).
- To determine the shape of the small subunit (30S).
- To identify functional sites within the ribosome, including the nascent protein path, protein biosynthesis site, and tRNA binding modes.
Main Methods:
- Three-dimensional image reconstruction from electron micrographs of two-dimensional ordered arrays.
- Analysis of diffraction data.
- Interactive computer graphics for model comparison and assessment.
Main Results:
- Low-resolution models (47 Å for 70S, 28 Å for 50S) were successfully obtained.
- The shape of the small subunit (30S) was derived.
- Key functional regions and interactions, such as nascent polypeptide exit, protein synthesis site, and tRNA binding, were localized.
Conclusions:
- The reliability of the 3D image reconstruction method was assessed.
- The derived models provide insights into ribosome function and dynamics.
- These models can aid in phasing low-resolution X-ray diffraction data for higher-resolution structural studies.