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The "n' effect in molecular recognition

M S Westwell1, M S Searle, D H Williams

  • 1Cambridge Centre for Molecular Recognition, University Chemical Laboratories, UK.

Journal of Molecular Recognition : JMR
|March 1, 1996
PubMed
Summary
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Crystal melting temperature correlates with intermolecular energy, enabling a predictive model for melting point and transition sharpness. This cooperativity principle also applies to biological molecular recognition and DNA/RNA duplex melting.

Area of Science:

  • Physical Chemistry
  • Biophysics
  • Crystallography

Background:

  • Cooperativity in crystal melting and biological molecular recognition stems from extensive weak interactions.
  • Understanding these interactions is key to predicting material properties and biological processes.

Purpose of the Study:

  • To establish a correlation between crystal melting temperature and intermolecular energy.
  • To develop a predictive model for crystal melting temperature and transition sharpness.
  • To extend the concept of cooperativity to biological systems.

Main Methods:

  • Analysis of intermolecular energy and melting temperatures, excluding compounds with internal rotors.
  • Development of a mathematical model based on the observed correlation.

Related Experiment Videos

  • Application of the model to understand order/disorder transitions in biological molecules.

    • Main Results:

    • A strong correlation was found between melting temperature and intermolecular energy in suitable crystalline compounds.
    • A model was developed capable of estimating crystal melting temperatures.
    • The 'n' effect' (cooperativity) was shown to be relevant for biological systems like DNA/RNA duplex melting.

    Conclusions:

    • Intermolecular energy and cooperativity are critical factors governing crystal melting and biological molecular recognition.
    • The developed model offers insights into the physical basis of sharp melting transitions.
    • The findings provide a unified perspective on order/disorder transitions across chemical and biological systems.