MECHANISTIC FEATURES OF RNA-DIRECTED MOLECULAR ASYMMETRY OF AMINO ACIDS
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- Tamura Koji
- Department of Biological Science and Technology, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science PRESTO, Japan Science and Technology Agency
Bibliographic Information
- Other Title
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- RNAによるアミノ酸の分子非対称性選択の作用機構
- RNA ニ ヨル アミノサン ノ ブンシ ヒタイショウセイ センタク ノ サヨウ キコウ
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Abstract
<p> Chiral-selective aminoacylation of an RNA minihelix (progenitor of the modern tRNA) could provide a crucial clue to solve the origin of homochirality in a biological system. In this reaction, an amino acid donor (aminoacyl phosphate oligonucleotide) is placed in close proximity to minihelix with the help of a bridging oligonucleotide, which possesses sequences complementary to both donor nucleotide and single-stranded NCCA of minihelix, to accomplish the chiral (L-amino acid)-selective aminoacylation of the minihelix. Here, we propose a molecular mechanism of chiral selectivity based on the mutational analysis of the donor and bridging nucleotides. The selectivity for L-amino acids is dependent on the stereochemistry of RNA. Due to cation coordination and sugar pucker, the side chain of D-amino acids is brought much closer to the terminal adenosine of the minihelix, thereby causing steric hindrance of the D-amino acids during amino acid transfer from the donor nucleotide to minihelix. This mechanism completely explains the result of the original chiral-selective aminoacylation experiment without any contradictions. This selective process may have determined the homochirality of L-amino acids in the putative RNA world.</p><p> </p><p>This article is dedicated to the memory of Dr. Kaoru Harada.</p>
Journal
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- Viva Origino
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Viva Origino 39 (3), 39-44, 2011
The Society for the Study of the Origin and Evolution of Life Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390009073681521408
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- NII Article ID
- 110009470536
- 130008137624
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- NII Book ID
- AA11148698
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- ISSN
- 13466933
- 09104003
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- NDL BIB ID
- 023889628
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- NDL-Digital
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Allowed