The central dogma of biological homochirality: How does chiral information propagate in a prebiotic network? [PDF]
, 2023 Biological systems are homochiral, raising the question of how a racemic mixture of prebiotically synthesized biomolecules could attain a homochiral state at the network level. Based on our recent results, we aim to address a related question of how chiral information might have flowed in a prebiotic network. Utilizing the crystallization properties of
arxiv +1 more source
On the stability of peptide nucleic acid duplexes in the presence of organic solvents [PDF]
, 2007 Nucleic acid double helices are stabilized by hydrogen bonding and stacking forces (a combination of hydrophobic, dispersive and electrostatic forces) of the base pairs in the helix.
Allawi +45 more
core +2 more sources
Cell-penetrating peptide conjugates of peptide nucleic acids (PNA) as inhibitors of HIV-1 Tat-dependent trans-activation in cells [PDF]
, 2005 The trans-activation response (TAR) RNA stem–loop that occurs at the 5′ end of HIV RNA transcripts is an important antiviral target and is the site of interaction of the HIV-1 Tat protein together with host cellular factors.
Abes, Saïd +7 more
core +2 more sources
Polyanionic Carboxyethyl Peptide Nucleic Acids (ce-PNAs): Synthesis and DNA Binding. [PDF]
PLoS ONE, 2015 New polyanionic modifications of polyamide nucleic acid mimics were obtained. Thymine decamers were synthesized from respective chiral α- and γ-monomers, and their enantiomeric purity was assessed. Here, we present the decamer synthesis, purification and
Yuliya Kirillova +9 more
doaj +1 more source
Antisense PNA accumulates in Escherichia coli and mediates a long post-antibiotic effect [PDF]
, 2007 Antisense agents that target growth-essential genes display surprisingly potent bactericidal properties. In particular, peptide nucleic acid (PNA) and phosphorodiamidate morpholino oligomers linked to cationic carrier peptides are effective in time kill ...
Behmanesh, Mehrdad +9 more
core +1 more source
Duplex formation and secondary structure of γ-PNA observed by NMR and CD [PDF]
, 2015 Peptide Nucleic Acids (PNA) are non-natural oligonucleotides mimics. {\gamma}-PNA backbone are formed by standard nucleic acids nucleobases connected by a neutral N-(2-aminoethyl)glycine backbone linked by a peptide bond. In this study, we use Nuclear Magnetic Resonance (NMR) and Circular Dichroism (CD) to explore the properties of the supramolecular ...
arxiv +1 more source
Mixed Anhydrides at the Intersection Between Peptide and RNA Autocatalytic Sets: Evolution of Biological Coding [PDF]
arXiv, 2022 We present a scenario for the origin of biological coding. In this context, coding is a semiotic relationship between chemical information stored in one location that links to chemical information stored in a separate location. Coding originated by the cooperative interaction of two, originally separate collectively autocatalytic sets, one for nucleic ...
arxiv
Acta Informatica Medica, 2011 Peptide nucleic acid (PNA) is a nucleic acid analog in which the sugar phosphate backbone of natural nucleic acid has been replaced by a synthetic peptide backbone usually formed from N-(2-amino-ethyl)-glycine units. It is chemically stable and resistant to hydrolytic enzyme cleavage and thus not expected to be degraded inside a living cell.
Lipismita Samal, Chinmoy Mishra
openaire +2 more sources
Machine-learned molecular mechanics force field for the simulation of protein-ligand systems and beyond [PDF]
, 2023 The development of reliable and extensible molecular mechanics (MM) force fields -- fast, empirical models characterizing the potential energy surface of molecular systems -- is indispensable for biomolecular simulation and computer-aided drug design. Here, we introduce a generalized and extensible machine-learned MM force field, \texttt{espaloma-0.3},
arxiv +1 more source
Specific recognition of a multiply phosphorylated motif in the DNA repair scaffold XRCC1 by the FHA domain of human PNK. [PDF]
, 2009 Short-patch repair of DNA single-strand breaks and gaps (SSB) is coordinated by XRCC1, a scaffold protein that recruits the DNA polymerase and DNA ligase required for filling and sealing the damaged strand.
Ali, Ammar A. E. +3 more
core +3 more sources