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Updated: Sep 25, 2026
X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
Published on: May 13, 2020
Crystallization and preliminary X-ray diffraction analysis of ribosomal protein L11 methyltransferase from Thermus
Tatsuya Kaminishi1, Hiroaki Sakai, Chie Takemoto-Hori
1RIKEN Genomic Sciences Center, 1-7-22 Suehiro-cho, Tsurumi, Yokohama 230-0045, Japan.
Abstract:
Ribosomal proteins are subjected to a variety of post-translational modifications, of which methylation is the most frequently found in all three kingdoms of life. PrmA is the only bacterial enzyme identified to date that catalyzes the methylation of a ribosomal protein. It is responsible for the introduction of nine methyl groups into the N-terminal domain of ribosomal protein L11. The PrmA protein from Thermus thermophilus HB8 was crystallized and a preliminary X-ray diffraction analysis was performed. A cryocooled crystal diffracted X-rays beyond 1.9 A using synchrotron radiation.
Insights
Methylation, a common protein modification, is catalyzed by the bacterial enzyme PrmA, which adds methyl groups to ribosomal protein L11. Researchers crystallized PrmA from Thermus thermophilus HB8 for structural analysis.
Area of Science:
- Biochemistry
- Structural Biology
- Microbiology
Background:
- Ribosomal proteins undergo various post-translational modifications, with methylation being prevalent across all life forms.
- PrmA is the sole identified bacterial enzyme catalyzing ribosomal protein methylation.
- PrmA specifically methylates ribosomal protein L11, adding nine methyl groups to its N-terminal domain.
Purpose of the Study:
- To investigate the structure of the PrmA enzyme from Thermus thermophilus HB8.
- To facilitate structural analysis of PrmA through crystallization and X-ray diffraction.
Main Methods:
- Crystallization of the PrmA protein from Thermus thermophilus HB8.
- Preliminary X-ray diffraction analysis of the PrmA crystal.
- X-ray diffraction data collection using synchrotron radiation on a cryocooled crystal.
Main Results:
- A crystal of Thermus thermophilus HB8 PrmA was successfully obtained.
- The crystal diffracted X-rays to a resolution better than 1.9 Å.
- Preliminary structural data was acquired using synchrotron radiation.
Conclusions:
- The crystallization of PrmA provides a foundation for detailed structural studies.
- Understanding PrmA structure can elucidate the mechanism of ribosomal protein methylation.
- This research contributes to the knowledge of bacterial post-translational modifications and ribosome biogenesis.
