What question did this study set out to answer?

To determine whether thermodynamic stability at the critical G•U position in the tRNA(Ala) acceptor helix governs aminoacylation specificity by alanyl-tRNA synthetase.

November 1, 1999RNAOpen Access

The relationship of thermodynamic stability at a G•U recognition site to tRNA aminoacylation specificity

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Authors

PSPeter StrazewskiUniversité Claude Bernard Lyon 1 EBEwa BiałaInstitute of Bioorganic Chemistry, Polish Academy of Sciences KGKay GabrielUniversity of Wisconsin System

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Implication

In vitro study reveals that thermodynamic stability does not dictate aminoacylation efficiency in Escherichia coli tRNA(Ala), indicating conformational deformability drives enzyme recognition.

Key Points

To determine whether thermodynamic stability at the critical G•U position in the tRNA(Ala) acceptor helix governs aminoacylation specificity by alanyl-tRNA synthetase.
Generated a comprehensive library of Escherichia coli tRNA(Ala) variants containing Watson-Crick and mispair substitutions at the third-position G•U site.
Measured thermodynamic stability of the free RNA variants and assessed their corresponding aminoacylation acceptor activity with alanyl-tRNA synthetase.
Watson-Crick base-pair substitutions yielded higher thermodynamic stability but lower aminoacylation acceptor activity relative to the wild-type G•U pair.
Mispair substitutions systematically reduced thermodynamic stability while displaying divergent effects on acceptor activity, producing either higher or lower charging levels.
Thermodynamic stability of free, unbound tRNA does not correlate with aminoacylation activity, suggesting that local structural deformability allows productive docking into the synthetase active site.

Cite This Study

Strazewski et al. (1999) studied this question.

synapsesocial.com/papers/6a830e5a1557c09efd7d5c16 https://doi.org/10.1017/s1355838299991586

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Implication

In vitro study reveals that thermodynamic stability does not dictate aminoacylation efficiency in Escherichia coli tRNA(Ala), indicating conformational deformability drives enzyme recognition.

The relationship of thermodynamic stability at a G•U recognition site to tRNA aminoacylation specificity

Discussion

Member takes

Implication

Key Points

Cite This Study

The relationship of thermodynamic stability at a G•U recognition site to tRNA aminoacylation specificity

Discussion

Member takes

Implication

Key Points

Cite This Study

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