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Temperature-induced structural changes in putidaredoxin: a circular dichroism and UV-VIS absorption study.

Vytas Reipa¹, Marcia Holden, Martin P Mayhew

¹Biotechnology Division, National Institute of Standards and Technology, Stop 8312, Gaithersburg, MD 20899-8312, USA. vytas@nist.gov

Biochimica Et Biophysica Acta

|May 26, 2004

Summary

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Putidaredoxin (Pdx), an iron-sulfur protein, exhibits two distinct temperature transitions affecting its structure and redox potential during camphor hydroxylation. These transitions reveal insights into protein stability and electron transfer mechanisms.

Area of Science:

Biochemistry
Protein Structure and Dynamics
Enzymology

Background:

Putidaredoxin (Pdx) is a crucial iron-sulfur protein facilitating electron transfer to cytochrome P450cam in camphor hydroxylation.
Understanding Pdx's structural dynamics is key to elucidating its role in enzymatic reactions.

Purpose of the Study:

To investigate the temperature-dependent structural transitions of Putidaredoxin (Pdx).
To correlate these transitions with changes in redox potential and protein stability.

Main Methods:

UV-VIS absorption spectroscopy to monitor electronic transitions.
Circular dichroism (CD) spectroscopy to assess protein secondary and tertiary structure changes.
Temperature-dependent measurements to identify transition points.

Related Experiment Videos

Main Results:

Two distinct thermal transitions were observed at 16.3°C and 28.4°C.
The 16.3°C transition involves disruption of active site hydrogen bonds.
The 28.4°C transition, specific to the oxidized state (Pdx(ox)), destabilizes the protein and shifts the redox potential.

Conclusions:

Pdx undergoes significant structural rearrangements at specific temperatures, impacting its function.
Hydrogen bonding network disruptions are critical for Pdx's thermal transitions and redox behavior.
Spectroscopic methods effectively detect subtle protein backbone changes related to thermal stability.