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Related Experiment Videos

A temperature-regulated iso-hyperbaric spectrophotometer: construction and performance characteristics

J Q Wu1, R B Macgregor

  • 1Department of Medicinal Chemistry, University of Illinois, Chicago 60612.

Analytical Biochemistry
|May 15, 1993
PubMed
Summary

This study introduces a new instrument for precisely measuring how pressure and temperature affect biochemical reactions, revealing insights into hydration

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Area of Science:

  • Biochemistry
  • Biophysical Chemistry
  • Molecular Biology

Background:

  • Equilibrium positions in biochemical systems are influenced by both temperature and pressure.
  • Pressure perturbations offer unique insights into reaction mechanisms, particularly the role of hydration.
  • Traditional studies often focus solely on temperature effects, neglecting pressure-induced changes.

Purpose of the Study:

  • To describe the design and capabilities of a novel instrument for controlled temperature and pressure studies.
  • To investigate the pressure-induced effects on the thermal denaturation of synthetic polynucleotides.
  • To demonstrate the instrument's utility for optical monitoring of reactions across a wide temperature and pressure range.

Main Methods:

  • Construction and characterization of a computer-controlled instrument for simultaneous temperature (-40 to +140°C) and pressure (0.1 to 250 MPa) manipulation.

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  • Automatic data acquisition using spectrophotometry or spectrofluorimetry.
  • Analysis of thermal denaturation curves for poly[d(A-T)] and poly(dA).poly(dT) under varying pressure conditions.

    • Main Results:

    • The instrument successfully controlled temperature and pressure, enabling precise data acquisition.
    • The volume change upon denaturation (ΔV°) for poly[d(A-T)] was determined to be +0.30 ± 0.09 cm³/mol (base pairs).
    • The volume change upon denaturation (ΔV°) for poly(dA).poly(dT) was determined to be +3.05 ± 0.15 cm³/mol (base pairs).

    Conclusions:

    • The developed instrument is effective for studying pressure-temperature effects on biochemical systems.
    • The results provide quantitative data on the volume changes associated with the thermal denaturation of specific DNA structures.
    • The instrument is versatile and applicable to a broad range of optically detectable equilibrium reactions.