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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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Updated: Dec 30, 2025

Residue-Specific Exchange of Proline by Proline Analogs in Fluorescent Proteins: How "Molecular Surgery" of the Backbone Affects Folding and Stability
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Conformational landscape of substituted prolines.

Himal Kanti Ganguly1, Gautam Basu2

  • 1Department of Biophysics, Bose Institute, P-1/12 CIT scheme VII M, Kolkata, 700054, India. h.k.ganguly@gmail.com.

Biophysical Reviews
|January 19, 2020
PubMed
Summary

Substituted proline derivatives influence peptide and protein structures by altering conformational equilibria. These modifications offer new tools for chemical biology and drug discovery.

Keywords:
Cis-transCollagenConformational restrictionExo-endoProlineSubstituted proline

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Area of Science:

  • Chemical Biology
  • Structural Biology
  • Medicinal Chemistry

Background:

  • Proline's cyclic side chain uniquely restricts backbone and side chain dihedral angles, influencing cis/trans and endo/exo equilibria.
  • Substituents on the proline ring introduce steric and stereoelectronic effects, further modulating these conformational preferences and backbone dihedral angles (ϕ, ψ).

Purpose of the Study:

  • To explore the conformational landscape of mono-substituted proline derivatives.
  • To correlate observed conformations with substituent properties and understand underlying structural biases.
  • To discuss the impact of these derivatives in model peptides and proteins.

Main Methods:

  • Conformational analysis of termini-capped mono-substituted proline derivatives using the Cambridge Structural Database.
  • Correlation of observed conformations with substituent characteristics and stereoelectronic effects.
  • Review of selected cases demonstrating the incorporation of these derivatives in peptides and proteins.

Main Results:

  • Identified distinct conformational biases associated with various proline ring substituents.
  • Demonstrated how substituents modulate backbone and side chain dihedral angle equilibria.
  • Highlighted the utility of substituted prolines in introducing bioorthogonal functionality, modulating ligand recognition, and serving as spectroscopic probes.

Conclusions:

  • Substituted proline derivatives offer a versatile platform for controlling amino acid conformation through stereoelectronic effects.
  • These derivatives have broad applicability in chemical biology, molecular biophysics, and medicinal chemistry for designing functional peptides and proteins.
  • The ability to fine-tune conformation and introduce novel functionalities makes substituted prolines valuable tools for diverse research areas.