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. 2002 Jan;82(1 Pt 1):426–436. doi: 10.1016/S0006-3495(02)75407-6

The enzyme horseradish peroxidase is less compressible at higher pressures.

László Smeller 1, Judit Fidy 1
PMCID: PMC1302482  PMID: 11751329

Abstract

Fluorescence line-narrowing (FLN) spectroscopy at 10 K was used to study the effect of high pressure through the prosthetic group in horseradish peroxidase (HRP), which was Mg-mesoporphyrin (MgMP) replacing the heme of the enzyme. The same measurement was performed on MgMP in a solid-state amorphous organic matrix, dimethyl sulfoxide (DMSO). Series of FLN spectra were registered to determine the (0, 0) band shape through the inhomogeneous distribution function (IDF). In the range of 0-2 GPa a red-shift of the IDF was determined, and yielded the isothermal compressibility of MgMP-HRP as 0.066 GPa(-1), which is significantly smaller than that found earlier as 0.106 GPa(-1) by fine-tuning the pressure in the range up to 1.1 MPa. The vibrational frequencies also shifted with pressure increase, as expected. The compressibility in the DMSO matrix was smaller, 0.042 GPa(-1), both when the pressure was applied at room temperature before cooling to 10 K, or at 10 K. At 200 K or above, the bimodal (0, 0) band shape in DMSO showed a population conversion under pressure that was not observed at or below 150 K. A significant atomic rearrangement was estimated from the volume change, 3.3 +/- 0.7 cm(3)/mol upon conversion. The compressibility in proteins and in amorphous solids seems not to significantly depend on the temperature and in the protein it decreases toward higher pressures.

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Selected References

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