Human tRNA(Gly) acceptor-stem microhelix: crystallization and preliminary X-ray diffraction analysis at 1.2 A...

Area of Science:

• Molecular Biology
• Structural Biology
• Biochemistry

Background:

• Eukaryotic/archaeal and eubacterial glycyl-tRNA synthetase (GlyRS) systems exhibit significant evolutionary divergence.
• These differences in GlyRS systems are linked to distinct identity elements in their respective tRNA(Gly) molecules, particularly the acceptor stem and discriminator base U73.

Purpose of the Study:

• To investigate the structural basis for the recognition of human tRNA(Gly) by the eukaryotic/archaebacterial-type glycyl-tRNA synthetase.
• To elucidate the specific structural features within the tRNA(Gly) acceptor stem that mediate accurate aminoacylation.

Main Methods:

• Crystallization of the human tRNA(Gly) acceptor-stem microhelix.
• X-ray diffraction analysis of the crystallized microhelix.
• High-resolution data collection using synchrotron radiation and data processing to 1.2 Å resolution.

Main Results:

• The human tRNA(Gly) acceptor-stem helix crystallized in the monoclinic space group C2.
• Unit-cell parameters were determined as a = 37.12, b = 37.49, c = 30.38 Å, with β = 113.02°.
• The crystal structure was resolved to a high resolution of 1.2 Å, providing detailed structural insights.

Conclusions:

• The study provides high-resolution structural data of the human tRNA(Gly) acceptor stem.
• These findings are crucial for understanding the molecular mechanisms of tRNA-enzyme recognition in GlyRS systems.
• The structural information contributes to understanding the evolutionary diversification of aminoacyl-tRNA synthetases.