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Crystallization of halorhodopsin from Halobacterium sp. shark
Hirokazu Nishida1, Takeshi Sakamoto, Tomoko Takeshita
1Central Research Laboratory, Hitachi, Ltd., 1-280, Higashi-Koigakubo, Kokubunji-shi, Tokyo 185-8601, Japan. nishida@beri.or.jp
Biochimica Et Biophysica Acta
|April 26, 2005
Summary
Researchers crystallized halorhodopsin, a chloride-ion-pumping channel from Halobacterium sp. shark. This structural study provides insights into the protein
Area of Science:
- Structural biology
- Biophysics
- Microbial protein structures
Background:
- Halorhodopsin is a light-driven chloride-ion pump crucial for cellular homeostasis in Halobacterium species.
- Understanding the structure of halorhodopsin is key to elucidating its ion-pumping mechanism.
Purpose of the Study:
- To determine the three-dimensional structure of halorhodopsin from Halobacterium sp. shark.
- To characterize the crystallization and diffraction properties of the protein.
Main Methods:
- Detergent solubilization of halorhodopsin using n-octyl-beta-D-glucoside.
- Crystallization of the protein with polyethylene glycol 4000.
- X-ray diffraction analysis using synchrotron radiation.
Main Results:
- Successfully obtained 3-D crystals of halorhodopsin belonging to space group P4(1)2(1)2.
- Determined unit-cell dimensions: a=b=74.5 Å, c=138.6 Å.
- Achieved a resolution of 3.3 Å along the c-axis for the best-ordered crystal.
Conclusions:
- The study reports the successful crystallization and initial structural analysis of halorhodopsin.
- These findings pave the way for detailed structural studies of this important ion-pumping protein.