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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...
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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...
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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...
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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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...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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A Micropatterning Assay for Measuring Cell Chirality
08:07

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Published on: March 11, 2022

Punctuated chirality.

Marcelo Gleiser1, Joel Thorarinson, Sara Imari Walker

  • 1Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755, USA. gleiserm@gmail.com

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|October 9, 2008
PubMed
Summary
This summary is machine-generated.

Environmental events may explain life's homochirality. High intensity and long duration events can drive initial achiral conditions toward chirality, suggesting sequential chiral symmetry breaking in the prebiotic world.

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Area of Science:

  • Astrobiology
  • Origin of Life Research
  • Chemical Evolution

Background:

  • Life exhibits homochirality, using only specific mirror-image forms (enantiomers) of molecules like amino acids and sugars.
  • The origin of this fundamental asymmetry in biomolecules remains a significant unsolved scientific question.
  • Existing theories struggle to explain the transition from potentially racemic (mixed enantiomers) prebiotic conditions to homochiral life.

Purpose of the Study:

  • To investigate the potential role of environmental factors in establishing homochirality in early life.
  • To model how external events could induce chiral symmetry breaking in prebiotic chemical networks.
  • To extend theories of evolutionary change, like punctuated equilibrium, to the origin of life.

Main Methods:

  • Simulating autocatalytic polymerization reaction networks with coupled spatiotemporal evolution.
  • Incorporating external environmental effects, specifically high intensity and long duration events.
  • Performing detailed statistical analysis on simulation outcomes to identify drivers of chirality.

Main Results:

  • Demonstrated that specific environmental events can drive achiral systems towards homochirality.
  • Identified high intensity and long duration events as key triggers for chiral symmetry breaking.
  • Showed that sequential breaking of chiral symmetry by environmental events is a plausible mechanism.

Conclusions:

  • Life's homochirality likely arose from a series of environmentally triggered chiral symmetry breaking events.
  • This process extends the concept of punctuated equilibrium to the prebiotic chemical and biological origins.
  • Extrapolating to other planets, a statistical average of life's precursors is predicted to be racemic.