Reference: Mullin J, et al. (2024) Overexpressed yeast Bax inhibitor (Bxi1p/Ybh3p) is a calcium channel in E. coli. SciEnggJ 17:36-41

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Abstract


Human Bax Inhibitor-1 (HsBI-1/TMBIM6) is the founding member of the evolutionary conserved TMBIM superfamily of proteins that share sequence homology within the transmembrane Bax inhibitor-containing (TMBIM). Mechanistically, BI-1/TMBIM6 and all the other mammalian TMBIM proteins appear to be involved in the maintenance of calcium homeostasis, and the crystal structure of a bacterial TMBIM protein, BsYetJ, suggests that the protein is a pHsensitive calcium leak. The budding yeast, Saccharomyces cerevisiae, has a single TMBIM family member (YNL305C) named Bxi1p/Ybh3p. To determine the function Bxi1p/Ybh3p, we overexpressed Bxi1p-GFP in E. coli to interrogate its putative calcium channel function. We show that bacterial cells expressing Bxi1p-GFP are more permeable to calcium than controls. Our data suggests that yeast Bax inhibitor (Bxi1p) is a calcium channel in E. coli, lending support to our proposal that Bxi1p is a bona fide member of the TMBIM family of proteins. Finally, parallel experiments also revealed that the human Bax Inhibitor-1 (HsBI1/TMBIM6) is also a calcium channel in bacteria.

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Mullin J, Kalhorn J, Aguiar J, Crago M, Mello N, Raffa A, Strakosha A, Austriaco N
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