Zn2+-mediated domain-domain communication in human erythrocyte band 3

Yaping Tu, F. Y. Yang

Research output: Contribution to journalArticle

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Abstract

Zn2+ could inhibit the anion transport activity of spectrin-stripped inside-out human erythrocyte membrane vesicles (IOVs). Removal of the cytoplasmic domain from Band 3 by trypsin could eliminate Zn2+ inhibition. The location of a Zn2+-binding site was confirmed by atomic absorbance spectrometry. The results of time-resolved fluorescence and intrinsic fluorescence quenching by KI and hypocrellin B (a photosensitive pigment obtained from a parasitic fungus growing in Yunnan, China) showed that the cytoplasmic domain is necessary for the Zn2+-induced conformational changes of the whole molecule as well as the membrane domain of Band 3. It is suggested that Zn2+ induced a conformational change in the cytoplasmic domain of Band 3, which in turn was transmitted to the membrane domain, resulting in an inhibition of activity of Band 3. Such long-range conformational changes may imply that the cytoplasmic domain is poised to function as a cytosolic arm in order to modulate the structure of the membrane domain of Band 3.

Original languageEnglish
Pages (from-to)161-167
Number of pages7
JournalJournal of Biochemistry
Volume118
Issue number1
Publication statusPublished - Jul 1995
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Physiology (medical)
  • Radiology Nuclear Medicine and imaging
  • Molecular Biology
  • Biochemistry

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