Effects of chemical modification of cysteines 201 and 317 of band 3 on hemolytic properties of human erythrocytes under hydrostatic pressure

Takeo Yamaguchi, Tadaomi Nakano, Masaki Matsumoto, Shigeyuki Terada

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In the membrane stability of human erythrocytes, the role of two cysteine residues (Cys-201 and Cys-317) in the cytoplasmic domain of band 3 is not clear. So we tried to resolve this problem by examining hemolytic properties under high pressure. From SH contents and spinlabeling, it was found that Cys-201 and Cys-317 of band 3 were modified with N-ethylmaleimide (NEM). The hemolysis of intact erythrocytes at 200 MPa was suppressed by the binding of 4,4'-diisothiocyanostilbene-2,2'-disulfonate (DIDS) anion transport inhibitor, to band 3. Similarly, the suppressive effect of DIDS was observed in the erythrocyte that Cys-201 and Cys-317 were modified with NEM. These results suggest that the cysteine residues in the cytoplasmic domain of band 3 are not essential for the DIDS-induced membrane stabilization.

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalJapanese Journal of Physiology
Issue number3
Publication statusPublished - Jun 1 1998
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physiology

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