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Crystallization and preliminary X-ray diffraction analysis of Mycobacterium smegmatis Dps
Siddhartha Roy1, Surbhi Gupta, Satyabrata Das
1Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India.
Acta Crystallographica. Section D, Biological Crystallography
|December 4, 2003
Summary
Researchers crystallized three forms of Mycobacterium smegmatis DNA-binding protein (Dps). The cubic form
Area of Science:
- Structural biology
- Biochemistry
- Microbiology
Background:
- DNA-binding proteins (Dps) are crucial for protecting DNA in stationary phase cells.
- Mycobacterium smegmatis is a model organism for studying mycobacterial physiology.
Purpose of the Study:
- To determine the crystal structures of Mycobacterium smegmatis Dps.
- To elucidate the quaternary structure of M. smegmatis Dps.
Main Methods:
- Crystallization of three Dps forms: hexagonal, tetragonal, and cubic.
- X-ray crystallography and molecular replacement for structure determination.
- Analysis of crystallographic symmetry operations.
Main Results:
- Successfully grew three distinct crystal forms of M. smegmatis Dps.
- Solved the high-resolution structure of the cubic Dps form.
- Identified an eight-dodecamer assembly with 23 symmetry in the cubic crystal.
Conclusions:
- The cubic crystal form reveals the dodecameric quaternary structure of M. smegmatis Dps.
- This structural information provides insights into DNA protection mechanisms in mycobacteria.