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. 2001 Dec 1;360(Pt 2):355–362. doi: 10.1042/0264-6021:3600355

The influence of oxidation of membrane thiol groups on lysosomal proton permeability.

F Y Wan 1, Y N Wang 1, G J Zhang 1
PMCID: PMC1222235  PMID: 11716763

Abstract

The influence of oxidation of membrane thiol groups on lysosomal proton permeability was studied by measuring lysosomal pH with FITC-conjugated dextran, determining the membrane potential with 3,3'-dipropylthiadicarbocyanine iodide and monitoring their proton leakage with p-nitrophenol. Residual membrane thiol groups were measured with 5,5'-dithiobis-(2-nitrobenzoic acid). The lysosomal membrane thiol groups were modified by treatment with diamide and dithiothreitol. SDS/PAGE revealed aggregations of the membrane proteins induced by the treatment of lysosomes with diamide. The cross-linkage of proteins could be abolished by subsequent treatment with dithiothreitol, indicating that the proteins were linked via disulphide bonds. Treating the lysosomes with diamide decreased their membrane thiol groups and caused increases in lysosomal pH, membrane potential and proton leakage, which could be reversed by treatment of the lysosomes with dithiothreitol. This indicates that the lysosomal proton permeability can be increased by oxidation of the membrane thiol groups and restored to the normal level by reduction of the groups. Treatment of the lysosomes with N-ethylmaleimide reduced their membrane thiol groups but did not change the lysosomal pH or their degree of proton leakage. It suggests that protein aggregation may be an important mechanism for the increase in lysosomal proton permeability. The results raise the possibility that the proton permeability of lysosomes in vivo may be affected by the redox states of their membrane thiol groups.

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Selected References

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