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. 1976 Oct;73(10):3558–3561. doi: 10.1073/pnas.73.10.3558

Erythrocyte membranes undergo cooperative, pH-sensitive state transitions in the physiological temperature range: evidence from Raman spectroscopy.

S P Verma, D F Wallach
PMCID: PMC431156  PMID: 10571

Abstract

We have examined the Raman scattering from erythrocyte ghosts at 2700 to 3000 cm-1 (CH-stretching region). Plots of the intensity (I) of the 2930 cm-1 band relative to the intensity of the thermally stable 2850 cm-1 band, i.e., the [I2930/I2850] ratio, as a function of temperature reveal a sharp discontinuity, which at pH 7.4 has a lower limit of 38 degrees and is irreversible above 42 degrees. [I2930/I2850] is stable between pH 7.0 and pH 7.4, but increases or decreases sharply below pH 7.0 or above pH 7.5, respectively. Reduction of pH to 6.5 lowers the transition temperature by about 16 degrees, and a shift to pH 6.0 drops the transition range to 0 to 7 degrees. The above effects of temperature and pH on Raman scattering closely correspond to those detected by studies on the interaction of membrane protein fluorophores and lipid-soluble fluorescence quenchers [Bieri, V. and Wallach, D.F.H. (1975) Biochim. Biophys. Acta 406, 415-423]. Taken together, these results suggest that the transitions represent concerted process, involving hydrophobic amino acid residues and lipid chains at apolar protein-lipid boundaries.

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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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