N- and C-Terminal Halves of Human Annexin VI Differ in Ability to Form Low pH-Induced Ion Channels
Biochemical and Biophysical Research Communications, ISSN: 0006-291X, Vol: 284, Issue: 3, Page: 785-791
2001
- 15Citations
- 2Captures
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Metrics Details
- Citations15
- Citation Indexes15
- 15
- CrossRef13
- Captures2
- Readers2
Article Description
Human recombinant annexin VI (AnxVI) or its N- (AnxVIA) and C-terminal (AnxVIB) fragments were expressed in E. coli. Their ability to form voltage-dependent ion channels in membranes, induced by low pH, was measured to verify the hypothesis that, upon acidification, the hydrophobicity of AnxVI at a specific domain significantly increases allowing the AnxVI interaction with lipids in a Ca 2+ -independent manner. By theoretically analyzing changes in protein hydrophobicity, we found that hydrophobicity of AnxVIA significantly differed from that of AnxVIB at low pH. These predictions were confirmed experimentally by using planar lipid bilayers and liposome pull-down assay. We found striking difference between AnxVIA and AnxVIB in the ion channel activity, as well as in the membrane binding, suggesting that the halves of AnxVI maybe functionally different. Moreover, we calculated and predicted that the ion channel activity at low pH should appear in other human annexins, as AnxII, AnxV (as known), AnxVIII, and AnxXIII. The possibility that AnxVI acts as cytosolic component of a transmembrane pH-sensing mechanism is proposed.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0006291X0195051X; http://dx.doi.org/10.1006/bbrc.2001.5051; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0034810737&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/11396971; https://linkinghub.elsevier.com/retrieve/pii/S0006291X0195051X; https://dx.doi.org/10.1006/bbrc.2001.5051
Elsevier BV
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