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. 1970 Jun;118(2):319–323. doi: 10.1042/bj1180319

Dissociation of catalase. A correlation between changes in sedimentation and spectroscopic properties accompanying dissociation of bacterial catalase in alkaline solution

Peter Jones *, R H Pain †, A Suggett *,†,‡
PMCID: PMC1179121  PMID: 5484682

Abstract

1. At high concentrations, in 10mm-phosphate buffer, pH7.0, the sedimentation coefficient of bacterial catalase varies with concentration according to: [Formula: see text] with S020,w=11.30S and ks=6.29×10−3ml mg−1. Sedimentation-equilibrium experiments yield a molecular weight of 240000. 2. Parallel studies of changes in sedimentation-velocity behaviour and in electronic spectra of bacterial catalase at pH>11 were made. Dissociation is indicated by the appearance of a slow-moving (2.9S) component in sedimentation patterns and this is accompanied by marked changes in absorption spectrum in the Soret region. Values of R=E406/E355 show a theoretically predictable near-linear dependence on α, the degree of dissociation calculated from ultracentrifuge data. 3. The Soret absorption of bacterial catalase subunits is much lower than that of the native enzyme, and it is suggested that dissociation produces an environmental constraint on the prosthetic group that results in distortion of the porphyrin ring.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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