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RNA affinity for molecular L-histidine; genetic code origins
Irene Majerfeld1, Deepa Puthenvedu, Michael Yarus
1Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309-0347, USA.
Journal of Molecular Evolution
|July 7, 2005
Summary
Researchers discovered a single RNA aptamer that binds histidine with high specificity and stereoselectivity. This finding supports the stereochemical theory for the origin of the genetic code.
Area of Science:
- Biochemistry
- Molecular Biology
- Origin of Life studies
Background:
- The origin of the genetic code remains a fundamental question in science.
- Understanding the early interactions between amino acids and nucleic acids is crucial.
Purpose of the Study:
- To identify and characterize RNA molecules that can bind specific amino acids.
- To investigate the potential role of such interactions in the origin of the genetic code.
Main Methods:
- Selection of RNA aptamers for histidine binding.
- Biochemical characterization of RNA-aptamer-histidine interactions.
- Sequence and structural analysis of selected aptamers.
Main Results:
- A single RNA aptamer sequence was repeatedly selected for binding to histidine.
- This aptamer exhibits high specificity for L-histidine and significant stereoselectivity.
- The RNA possesses a conserved internal loop-hairpin loop structure with potential anticodon elements.
Conclusions:
- The identified RNA aptamer represents a simple structure capable of specific histidine recognition.
- These findings provide experimental support for a stereochemical mechanism in the origin of the genetic code.