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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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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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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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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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Chirality-Regulated Clusteroluminescence in Polypeptides.

Wangtao Zhao1, Mei Gao1, Liufen Kong1

  • 1School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.

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|February 8, 2024
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Summary
This summary is machine-generated.

Chirality influences the light emission of polypeptides. Racemic polypeptides show higher clusteroluminescence than enantiopure ones due to disordered structures promoting aggregation and stronger photoluminescence (PL).

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Area of Science:

  • Biophysical Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Clusteroluminogens exhibit low emission efficiency, limiting their use in sensors and bioimaging.
  • The relationship between polypeptide structure and clusteroluminescence is not fully understood.

Purpose of the Study:

  • To investigate how polypeptide chirality and structural order affect clusteroluminescence.
  • To explore the potential of modulating photoluminescence (PL) intensity through structural control.

Main Methods:

  • Synthesis of polyglutamates with varying chiral compositions (racemic and enantiopure).
  • Characterization using Circular Dichroism (CD) and Fourier Transform Infrared (FTIR) spectroscopy.
  • Measurement of photoluminescence (PL) intensity and analysis of emission origins (n-π* transition).

Main Results:

  • Racemic polypeptides showed significantly higher PL intensity than enantiopure ones.
  • Enantiopure polypeptides adopted α-helix structures, while racemic ones formed random coils.
  • Disordered structures (random coils) facilitated more chain entanglements and interchain interactions, enhancing clusterization and PL intensity.
  • Ordered structures (α-helices) restricted chain entanglements and favored intrachain hydrogen bonding, reducing PL intensity.

Conclusions:

  • Polypeptide chirality and structural order are critical factors controlling clusteroluminescence.
  • Disordered polypeptide structures enhance PL intensity through increased aggregation.
  • Findings provide insights for designing fluorescent peptides and proteins with tunable optical properties.