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Creating Prebiotic Sanctuary: Self-Assembling Supramolecular Peptide Structures Bind and Stabilize RNA

Carny, Ohad ; Gazit, Ehud

Origins of life and evolution of biospheres, 2011-04, Vol.41 (2), p.121-132 [Periódico revisado por pares]

Dordrecht: Dordrecht : Springer Netherlands

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Título:
Creating Prebiotic Sanctuary: Self-Assembling Supramolecular Peptide Structures Bind and Stabilize RNA
Autor: Carny, Ohad ; Gazit, Ehud
Assuntos: Aromatic interactions ; Astronomy ; Astrophysics and Astroparticles ; Binding sites ; Biochemistry ; Biomedical and Life Sciences ; Coevolution ; Diastereoisomers ; Earth Sciences ; Evolution ; Life Sciences ; Molecular biology ; Molecular evolution ; Molecular recognition ; Monomers ; Natural selection ; Observations and Techniques ; Origin of Life ; Peptides ; Peptides - chemistry ; Peptides - metabolism ; Prebiotic Self-Assembly ; Reproductive fitness ; Ribonucleic acid ; Ribonucleotides ; RNA ; RNA - chemistry ; RNA - metabolism ; Self-assembling peptides ; Self-association ; π-π stacking
É parte de: Origins of life and evolution of biospheres, 2011-04, Vol.41 (2), p.121-132
Notas: http://dx.doi.org/10.1007/s11084-010-9219-9
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Descrição: Any attempt to uncover the origins of life must tackle the known ‘blind watchmaker problem'. That is to demonstrate the likelihood of the emergence of a prebiotic system simple enough to be formed spontaneously and yet complex enough to allow natural selection that will lead to Darwinistic evolution. Studies of short aromatic peptides revealed their ability to self-assemble into ordered and stable structures. The unique physical and chemical characteristics of these peptide assemblies point out to their possible role in the origins of life. We have explored mechanisms by which self-assembling short peptides and RNA fragments could interact together and go through a molecular co-evolution, using diphenylalanine supramolecular assemblies as a model system. The spontaneous formation of these self-assembling peptides under prebiotic conditions, through the salt-induced peptide formation (SIPF) pathway was demonstrated. These peptide assemblies possess the ability to bind and stabilize ribonucleotides in a sequence-depended manner, thus increase their relative fitness. The formation of these peptide assemblies is dependent on the homochirality of the peptide monomers: while homochiral peptides (L-Phe-L-Phe and D-Phe-D-Phe) self-assemble rapidly in aqueous environment, heterochiral diastereoisomers (L-Phe-D-Phe and D-Phe-L-Phe) do not tend to self-assemble. This characteristic consists with the homochirality of all living matter. Finally, based on these findings, we propose a model for the role of short self-assembling peptides in the prebiotic molecular evolution and the origin of life.
Editor: Dordrecht: Dordrecht : Springer Netherlands
Idioma: Inglês;Holandês

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Creating Prebiotic Sanctuary: Self-Assembling Supramolecular Peptide Structures Bind and Stabilize RNA

Carny, Ohad ; Gazit, Ehud

Dordrecht: Dordrecht : Springer Netherlands

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