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Published on: January 2, 2013
Studies on the fragmentation of erythrocyte ghost membrane with p-chloromercuribenzoate in the micromolar range
Abstract:
The effects of nonsaturating amounts (5-60 nmol/mg membrane protein) of p-chloromercuribenzoate on the stability of unsealed erythrocyte ghosts were studied by turbidimetric measurements and direct observation by phase contrast microscopy. The organic mercurial provokes drastic disorganization of the membrane involving vesicle formation by inter- and externalization of the bilayer. These effects are not associated with a release in solution of membrane proteins which was shown in previous studies to occur at higher p-chloromercuribenzoate concentration. Attempts have been made to identify the proteins involved in this phenomenon by the use of nonsaturating amounts of radioactively-labelled p-chloromercuribenzoate. Actin and band 3 protein which are the first to be labelled, represent plausible candidates as sensitive targets for the disrupting organic mercurial. Stroma obtained from spherocytes did not show significant differences with normocytes in their stability with regard to p-chloromercuribenzoate. Other reagents including N-ethylmaleimide, diamide and DNAase I were also studied. The results suggest strongly that the integrity of the sulfhydryl groups of actin, as well as those of band 3 protein, is essential for the stability of the erythrocyte membrane.
Insights
p-chloromercuribenzoate disrupts erythrocyte membrane structure by causing vesicle formation. This effect involves actin and band 3 protein, highlighting the importance of sulfhydryl groups for membrane stability.
Area of Science:
- Biochemistry
- Cell Biology
- Membrane Biophysics
Background:
- Erythrocyte membrane stability is crucial for red blood cell function.
- Organic mercurials are known to interact with cellular components.
- Previous studies indicated protein release at higher p-chloromercuribenzoate concentrations.
Purpose of the Study:
- To investigate the effects of low concentrations of p-chloromercuribenzoate on erythrocyte ghost stability.
- To identify specific membrane proteins affected by p-chloromercuribenzoate.
- To understand the role of sulfhydryl groups in erythrocyte membrane integrity.
Main Methods:
- Turbidimetric measurements of erythrocyte ghosts.
- Phase contrast microscopy for direct observation.
- Labeling with radioactively-tagged p-chloromercuribenzoate.
Main Results:
- Nonsaturating amounts of p-chloromercuribenzoate caused membrane disorganization and vesicle formation.
- Actin and band 3 protein were the first to be labeled by the organic mercurial.
- Spherocyte stroma showed similar stability to normocytes when treated with p-chloromercuribenzoate.
Conclusions:
- The integrity of sulfhydryl groups in actin and band 3 protein is essential for erythrocyte membrane stability.
- p-chloromercuribenzoate at low concentrations disrupts the membrane without releasing proteins.
- Actin and band 3 protein are likely targets of p-chloromercuribenzoate's disruptive effects.
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