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Structure of a eukaryotic decoding region A-site RNA.

S R Lynch¹, J D Puglisi

¹Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305-5126, USA.

Journal of Molecular Biology

|March 10, 2001

Summary

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Aminoglycoside antibiotics bind to the ribosomal A site. Comparing eukaryotic and prokaryotic rRNA structures reveals key differences in nucleotide base-pairing and orientation, impacting drug binding pockets.

Area of Science:

Structural Biology
Molecular Biology
Biochemistry

Background:

Aminoglycoside antibiotics are crucial for treating bacterial infections by targeting the 16S ribosomal RNA (rRNA) A site.
Understanding the structural basis of aminoglycoside-antibiotic interactions is vital for developing new therapeutic agents.
Previous studies determined the structure of prokaryotic rRNA A-site oligonucleotides free and bound to aminoglycosides.

Purpose of the Study:

To determine the three-dimensional structure of a eukaryotic decoding region A-site oligonucleotide.
To compare the eukaryotic rRNA A-site structure with its unbound prokaryotic counterpart.
To elucidate structural differences influencing aminoglycoside binding.

Main Methods:

Homonuclear and heteronuclear Nuclear Magnetic Resonance (NMR) spectroscopy were employed to determine the eukaryotic rRNA structure.

Related Experiment Videos

Comparative structural analysis was performed between the determined eukaryotic structure and the known unbound prokaryotic rRNA structure.

Main Results:

The eukaryotic rRNA A-site structure shares similarities with the prokaryotic structure, including specific base-pairing interactions (U1406-U1495, C1407-G1494).
A key difference was observed at position 1408, with a G-A base-pair in the eukaryotic structure versus an A-A base-pair in the prokaryotic structure.
The G1408 in the eukaryotic structure is rotated towards the major groove, potentially altering the aminoglycoside binding pocket.

Conclusions:

Structural similarities and differences between eukaryotic and prokaryotic rRNA A sites have been elucidated.
The altered nucleotide orientation at position 1408 in the eukaryotic structure may influence aminoglycoside binding affinity and specificity.
These findings provide insights into the structural basis of antibiotic action and potential for drug resistance.