A gating mechanism of the BsYetJ calcium channel revealed in an endoplasmic reticulum lipid environment
The transmembrane BAX inhibitor-1-containing motif 6 (TMBIM6) is suggested to modulate apoptosis by regulating calcium homeostasis in the endoplasmic reticulum (ER). However, the precise molecular mechanism underlying this calcium regulation remains poorly understood. To shed light on this issue, we...
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Published in | Biochimica et biophysica acta. Biomembranes Vol. 1865; no. 5; p. 184153 |
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01.06.2023
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Abstract | The transmembrane BAX inhibitor-1-containing motif 6 (TMBIM6) is suggested to modulate apoptosis by regulating calcium homeostasis in the endoplasmic reticulum (ER). However, the precise molecular mechanism underlying this calcium regulation remains poorly understood. To shed light on this issue, we investigated all negatively charged residues in BsYetJ, a bacterial homolog of TMBIM6, using mutagenesis and fluorescence-based functional assays. We reconstituted BsYetJ in membrane vesicles with a lipid composition similar to that of the ER. Our results show that the charged residues E49 and R205 work together as a major gate, regulating calcium conductance in these ER-like lipid vesicles. However, these residues become largely inactive when reconstituted in other lipid environments. In addition, we found that D195 acts as a minor filter compared to the E49-R205 dyad. Our study uncovers a previously unknown function of BsYetJ/TMBIM6 in the calcium-dependent inactivation of BsYetJ, providing a framework for the development of a lipid-dependent mechanistic model of BsYetJ that will facilitate our understanding of calcium-dependent apoptosis.
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•All negatively charged residues of BsYetJ are studied in ER-like lipid vesicles.•E49 and R205 act cooperatively as a major gate for calcium conductance.•D195 acts as a relatively minor filter compared to the E49-R205 dyad.•This study reveals calcium-dependent inactivation of BsYetJ.•We provide a framework for a lipid-dependent mechanistic model of BsYetJ. |
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AbstractList | The transmembrane BAX inhibitor-1-containing motif 6 (TMBIM6) is suggested to modulate apoptosis by regulating calcium homeostasis in the endoplasmic reticulum (ER). However, the precise molecular mechanism underlying this calcium regulation remains poorly understood. To shed light on this issue, we investigated all negatively charged residues in BsYetJ, a bacterial homolog of TMBIM6, using mutagenesis and fluorescence-based functional assays. We reconstituted BsYetJ in membrane vesicles with a lipid composition similar to that of the ER. Our results show that the charged residues E49 and R205 work together as a major gate, regulating calcium conductance in these ER-like lipid vesicles. However, these residues become largely inactive when reconstituted in other lipid environments. In addition, we found that D195 acts as a minor filter compared to the E49-R205 dyad. Our study uncovers a previously unknown function of BsYetJ/TMBIM6 in the calcium-dependent inactivation of BsYetJ, providing a framework for the development of a lipid-dependent mechanistic model of BsYetJ that will facilitate our understanding of calcium-dependent apoptosis.
[Display omitted]
•All negatively charged residues of BsYetJ are studied in ER-like lipid vesicles.•E49 and R205 act cooperatively as a major gate for calcium conductance.•D195 acts as a relatively minor filter compared to the E49-R205 dyad.•This study reveals calcium-dependent inactivation of BsYetJ.•We provide a framework for a lipid-dependent mechanistic model of BsYetJ. The transmembrane BAX inhibitor-1-containing motif 6 (TMBIM6) is suggested to modulate apoptosis by regulating calcium homeostasis in the endoplasmic reticulum (ER). However, the precise molecular mechanism underlying this calcium regulation remains poorly understood. To shed light on this issue, we investigated all negatively charged residues in BsYetJ, a bacterial homolog of TMBIM6, using mutagenesis and fluorescence-based functional assays. We reconstituted BsYetJ in membrane vesicles with a lipid composition similar to that of the ER. Our results show that the charged residues E49 and R205 work together as a major gate, regulating calcium conductance in these ER-like lipid vesicles. However, these residues become largely inactive when reconstituted in other lipid environments. In addition, we found that D195 acts as a minor filter compared to the E49-R205 dyad. Our study uncovers a previously unknown function of BsYetJ/TMBIM6 in the calcium-dependent inactivation of BsYetJ, providing a framework for the development of a lipid-dependent mechanistic model of BsYetJ that will facilitate our understanding of calcium-dependent apoptosis. |
ArticleNumber | 184153 |
Author | Chu, Shu-Chi Chiang, Yun-Wei Cheng, Chu-Chun Lan, Yu-Jing |
Author_xml | – sequence: 1 givenname: Yu-Jing surname: Lan fullname: Lan, Yu-Jing – sequence: 2 givenname: Chu-Chun surname: Cheng fullname: Cheng, Chu-Chun – sequence: 3 givenname: Shu-Chi surname: Chu fullname: Chu, Shu-Chi – sequence: 4 givenname: Yun-Wei surname: Chiang fullname: Chiang, Yun-Wei email: ywchiang@mx.nthu.edu.tw |
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Cites_doi | 10.1016/j.str.2019.03.003 10.1016/j.neuron.2018.01.048 10.1016/j.plipres.2015.04.003 10.1093/nar/gkw408 10.1016/j.bbamcr.2016.12.023 10.1074/jbc.M115.637306 10.1016/j.bbamcr.2015.03.002 10.1371/journal.pone.0254242 10.1039/C9RA00896A 10.1016/j.ceca.2011.05.005 10.1074/jbc.M114.624395 10.1073/pnas.2014094117 10.1038/onc.2014.6 10.1073/pnas.1906823117 10.1038/s41467-020-17802-4 10.1016/j.neuron.2019.01.011 10.1101/gr.849004 10.1038/nrn959 10.1126/science.1252043 10.1074/jbc.M900030200 10.1016/j.bpj.2010.12.3724 10.1111/jnc.14119 10.1126/sciadv.abe5469 10.3390/ijms20092167 10.1093/nar/gkq399 |
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Keywords | Fluorescence Calcium channel Endoplasmic reticulum Electrochemical gradient Proteoliposomes Apoptosis |
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SubjectTerms | Apoptosis Calcium - metabolism Calcium channel Calcium Channels Electrochemical gradient Endoplasmic reticulum Endoplasmic Reticulum - metabolism Fluorescence Lipids Membrane Proteins - chemistry Proteoliposomes |
Title | A gating mechanism of the BsYetJ calcium channel revealed in an endoplasmic reticulum lipid environment |
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