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. 1996 Jun;64(6):2339–2342. doi: 10.1128/iai.64.6.2339-2342.1996

Binding of hemoglobin to the envelope of Porphyromonas gingivalis and isolation of the hemoglobin-binding protein.

S Fujimura 1, Y Shibata 1, K Hirai 1, T Nakamura 1
PMCID: PMC174076  PMID: 8675347

Abstract

The binding activity of the Porphyromonas gingivalis envelope and hemoglobin was examined over a wide range of pH values from 4.5 to 9.0. The binding activity in low-pH buffers was much higher than that at high pH; the optimum pHs for the binding were found to be 4.5 and 5.0. Since the hemoglobin bound to the envelope was found to dissociate in the pH 8.5 and 9.0 buffers, the binding is reversible. We hypothesized that hemoglobin-binding protein (HbBP), responsible for the binding to hemoglobin, exists in the envelope and confirmed its presence by dot blot determination with peroxidase-conjugated hemoglobin. Then we attempted to isolate HbBP from the solubilized (by a detergent) materials of the envelope by affinity chromatography. The molecular mass of HbBP was 19 kDa, and the isoelectric point was 4.3.

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Selected References

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