What question did this study set out to answer?

This research aims to explore how hydrostatic pressure influences the cross-linking of specific lysines in band 3, an anion exchanger.

February 14, 2026

Hydrostatic Pressure of 100 MPa Facilitates the Cross-Linking between Lysine-539 and Lysine-851 by Anion Transport Inhibitor in Band 3

Key Points

This research aims to explore how hydrostatic pressure influences the cross-linking of specific lysines in band 3, an anion exchanger.
Investigated the effect of 100 MPa hydrostatic pressure on cross-linking.
Utilized the anion transport inhibitor H2DIDS to modify band 3.
Assessed the impact on hemolysis at different pressures and pH levels.
Cross-linking between Lys-539 and Lys-851 in band 3 was significantly enhanced by 100 MPa pressure.
This cross-linking reduced hemolysis induced by 200 MPa in erythrocytes pre-exposed to alkaline pH.
Stabilization of bilayer-cytoskeleton interactions was observed due to cross-linking.

Abstract

Abstract Human erythrocyte band 3 is an anion exchanger and comprised of 14 transmembrane segments (TMs). Its function is inhibited by the modification of Lys-539 on TM 5 using 4,4’-diisothiocyanatodihydrostilbene 2,2’-disulfonate (H2DIDS). Upon exposure of band 3 to alkaline pH, another isothiocyanate group of H2DIDS can react with Lys-851 on TM 13. Thus, Lys-539 on TM 5 and Lys-851 on TM13 are cross-linked by H2DIDS. Such cross-linking was facilitated by a pressure of 100 MPa and suppressed the 200 MPa-induced hemolysis of erythrocytes pre-exposed to alkaline pH. Thus, the cross-linkage between TMs by H2DIDS stabilizes bilayer-cytoskeleton interactions and results in the reduction in the volume of band 3.

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Hydrostatic Pressure of 100 MPa Facilitates the Cross-Linking between Lysine-539 and Lysine-851 by Anion Transport Inhibitor in Band 3

Key Points

Abstract

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