Functional Interactions between BKCaα-Subunit and Annexin A5: Implications in Apoptosis.

Abstract:

:Proteomic studies have suggested a biochemical interaction between α subunit of the large conductance, voltage- and Ca2+-activated potassium channel (BKCaα), and annexin A5 (ANXA5), which we verify here by coimmunoprecipitation and double labelling immunocytochemistry. The observation that annexin is flipped to the outer membrane leaflet of the plasma membrane during apoptosis, together with the knowledge that the intracellular C-terminal of BKCaα contains both Ca2+-binding and a putative annexin-binding motif, prompted us to investigate the functional consequences of this protein partnership to cell death. Membrane biotinylation demonstrated that ANXA5 was flipped to the outer membrane leaflet of HEK 293 cells early in serum deprivation-evoked apoptosis. As expected, serum deprivation caused caspase-3/7 activation and this was accentuated in BKCaα expressing HEK 293 cells. The functional consequences of ANXA5 partnership with BKCaα were striking, with ANXA5 knockdown causing an increase and ANXA5 overexpression causing a decrease, in single BKCa channel Ca2+-sensitivity, measured in inside-out membrane patches by patch-clamp. Taken together, these data suggest a novel model of the early stages of apoptosis where membrane flippage results in removal of the inhibitory effect of ANXA5 on K+ channel activity with the consequent amplification of Ca2+ influx and augmented activation of caspases.

journal_name

Oxid Med Cell Longev

authors

Brazier SP,Telezhkin V,Kemp PJ

doi

10.1155/2016/1607092

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

1607092

eissn

1942-0900

issn

1942-0994

journal_volume

2016

pub_type

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