Appearance and disappearance of dendritic and chiral patterns in domains of Langmuir monolayers observed with Brewster angle microscopy

Article Abstract:

The study investigated the aggregation behavior and morphology of Langmiur films of anantiomeric (L) and racemic (DL) N-acyl amino acids on pure aqueous as well as metal cation containing subphases at the mesoscale level with the help of Brewster angle microscopy (BAM). At 303 K the L-enantiomer demonstrated a dendritic growth pattern, which leads to explicitly chiral domain shapes that correspond with the chirality of the film-forming molecules and for which hydrogen bridges as directed attractive forces are assumed to be responsible.

Thin films, Multilayered, Multilayered thin films, Enantiomers

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Comparison of the intermolecular energy surfaces of amino acids: Orientation-dependent chiral discrimination

Article Abstract:

The chiral discrimination in the orientation dependence of the intermolecular interaction of a pair of alanine molecules in their neutral and zwitterionic states is studied. The study reveals clear discrimination and homochiral preference without the use of parameters and shows that the energy surface of homochiral pair is more favorable in nature than the same of the heterochiral pair.

Intermolecular forces, Alanine

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Homochiral preference in peptide synthesis in ribosome: role of amino terminal, peptidyl terminal, and U2620

Article Abstract:

The origin of the peptide synthesis phenomenon is analyzed by using hybrid quantum chemical studies based on a model of peptidyl transferase center from the crystal structure of the ribosomal part of Haloarcula marismortui. The analysis has helped in understanding how preferred addition of L-L pairs of amino acids rather than D-L pairs have led to retention of homochirality in peptides.

Chirality, Ribosomes, Crystals, Crystal structure, Structure

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