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Related Concept Videos

Chirality in Nature02:30

Chirality in Nature

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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.
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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...
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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.
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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...
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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
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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.
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Life's homochirality: Across a prebiotic network.

S Furkan Ozturk1,2, Dimitar D Sasselov1

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Scientists explored a terrestrial pathway for biomolecular homochirality, the single-handedness of life's molecules. The genome is identified as a key site for achieving this network-scale homochirality on early Earth.

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Area of Science:

  • Origin of Life Studies
  • Astrobiology
  • Organic Chemistry

Background:

  • Biomolecular homochirality, the uniform handedness of biological molecules, remains a central mystery in the origin of life.
  • Existing research often focuses on single compounds or invokes extraterrestrial origins, limiting a comprehensive understanding.
  • Biological systems exhibit specific homochirality: right-handed sugars and nucleic acids, and left-handed amino acids.

Purpose of the Study:

  • To investigate a terrestrial pathway for achieving network-scale homochirality in prebiotic chemical systems.
  • To identify key molecular sites and processes responsible for the emergence of homochirality on early Earth.
  • To explain the opposite handedness of nucleic acids and peptides through nonenzymatic synthesis.

Main Methods:

  • Analysis of experimental results from independent studies on prebiotic chemistry.
  • Examination of data from pristine asteroid materials for extraterrestrial clues.
  • Theoretical modeling of nonenzymatic, stereoselective coded peptide synthesis.

Main Results:

  • A terrestrial pathway for network-scale homochirality is proposed, supported by experimental and extraterrestrial data.
  • The genome is identified as a crucial site for establishing homochirality across a prebiotic chemical network.
  • A mechanism for nonenzymatic synthesis explains the opposite handedness of D-nucleic acids and L-peptides.

Conclusions:

  • Network-scale homochirality is achievable through a terrestrial pathway, challenging extraterrestrial origin hypotheses.
  • The genome played a pivotal role in establishing molecular handedness essential for life.
  • Nonenzymatic stereoselective synthesis provides a plausible explanation for the observed chirality of key biomolecules.