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Related Concept Videos

Chirality in Nature02:30

Chirality in Nature

Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...
Chirality02:25

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
Properties of Enantiomers and Optical Activity02:24

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...

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A Micropatterning Assay for Measuring Cell Chirality
08:07

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Published on: March 11, 2022

Biological homochirality as result from a single event.

Werner Fuss1

  • 1Max-Planck-Institut für Quantenoptik, D-85741 Garching, Germany. w.fuss@mpq.mpg.de

Colloids and Surfaces. B, Biointerfaces
|August 4, 2009
PubMed
Summary

The origin of biological homochirality is unlikely due to the weak force. Circularly polarized light (CPL) may have influenced early polymers, with a single chance event potentially explaining homochiral molecule prevalence.

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Area of Science:

  • Astrobiology
  • Chemical Evolution
  • Origin of Life

Background:

  • Biological homochirality, the exclusive use of one enantiomer in biomolecules, remains a puzzle.
  • The weak force's parity violation is too weak to explain homochirality.
  • Circularly polarized light (CPL) is a potential abiotic factor influencing molecular chirality.

Purpose of the Study:

  • To evaluate the role of CPL in the origin of biological homochirality.
  • To propose a model for the formation of the first self-reproducing homochiral polymer.
  • To explain the observed patterns of chirality in natural sugars and related compounds.

Main Methods:

  • Theoretical analysis of physical and chemical factors influencing molecular chirality.
  • Modeling the probability of forming a self-reproducing homochiral polymer.
  • Review of existing literature on CPL effects and mineral adsorption.

Main Results:

  • The weak force is insufficient to explain biological homochirality.
  • CPL's influence on small molecules requires large quantities for polymerization.
  • A single, chance event of polymer formation could result in 100% enantiomeric excess, explaining homochirality.
  • This single-event hypothesis aligns with chirality patterns in natural compounds.

Conclusions:

  • Circularly polarized light (CPL) is a more plausible influence than the weak force for homochirality.
  • The formation of the first self-reproducing polymer likely occurred as a rare, chance event.
  • Mineral adsorption may have supported chiral enrichment, complementing physical effects.