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Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU
The mitochondrial calcium uniporter (MCU) is a calcium-activated calcium channel critical for signaling and bioenergetics. MCU, the pore-forming subunit of the uniporter, contains two transmembrane domains and is found in all major eukaryotic taxa. In amoeba and fungi, MCU homologs are sufficient to...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Life Science Alliance LLC
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7425227/ https://www.ncbi.nlm.nih.gov/pubmed/32769116 http://dx.doi.org/10.26508/lsa.202000718 |
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author | MacEwen, Melissa JS Markhard, Andrew L Bozbeyoglu, Mert Bradford, Forrest Goldberger, Olga Mootha, Vamsi K Sancak, Yasemin |
author_facet | MacEwen, Melissa JS Markhard, Andrew L Bozbeyoglu, Mert Bradford, Forrest Goldberger, Olga Mootha, Vamsi K Sancak, Yasemin |
author_sort | MacEwen, Melissa JS |
collection | PubMed |
description | The mitochondrial calcium uniporter (MCU) is a calcium-activated calcium channel critical for signaling and bioenergetics. MCU, the pore-forming subunit of the uniporter, contains two transmembrane domains and is found in all major eukaryotic taxa. In amoeba and fungi, MCU homologs are sufficient to form a functional calcium channel, whereas human MCU exhibits a strict requirement for the metazoan protein essential MCU regulator (EMRE) for conductance. Here, we exploit this evolutionary divergence to decipher the molecular basis of human MCU’s dependence on EMRE. By systematically generating chimeric proteins that consist of EMRE-independent Dictyostelium discoideum MCU and Homo sapiens MCU (HsMCU), we converged on a stretch of 10 amino acids in D. discoideum MCU that can be transplanted to HsMCU to render it EMRE independent. We call this region in human MCU the EMRE dependence domain (EDD). Crosslinking experiments show that EMRE directly interacts with HsMCU at its transmembrane domains as well as the EDD. Our results suggest that EMRE stabilizes the EDD of MCU, permitting both channel opening and calcium conductance, consistent with recently published structures of MCU-EMRE. |
format | Online Article Text |
id | pubmed-7425227 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Life Science Alliance LLC |
record_format | MEDLINE/PubMed |
spelling | pubmed-74252272020-08-26 Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU MacEwen, Melissa JS Markhard, Andrew L Bozbeyoglu, Mert Bradford, Forrest Goldberger, Olga Mootha, Vamsi K Sancak, Yasemin Life Sci Alliance Research Articles The mitochondrial calcium uniporter (MCU) is a calcium-activated calcium channel critical for signaling and bioenergetics. MCU, the pore-forming subunit of the uniporter, contains two transmembrane domains and is found in all major eukaryotic taxa. In amoeba and fungi, MCU homologs are sufficient to form a functional calcium channel, whereas human MCU exhibits a strict requirement for the metazoan protein essential MCU regulator (EMRE) for conductance. Here, we exploit this evolutionary divergence to decipher the molecular basis of human MCU’s dependence on EMRE. By systematically generating chimeric proteins that consist of EMRE-independent Dictyostelium discoideum MCU and Homo sapiens MCU (HsMCU), we converged on a stretch of 10 amino acids in D. discoideum MCU that can be transplanted to HsMCU to render it EMRE independent. We call this region in human MCU the EMRE dependence domain (EDD). Crosslinking experiments show that EMRE directly interacts with HsMCU at its transmembrane domains as well as the EDD. Our results suggest that EMRE stabilizes the EDD of MCU, permitting both channel opening and calcium conductance, consistent with recently published structures of MCU-EMRE. Life Science Alliance LLC 2020-08-07 /pmc/articles/PMC7425227/ /pubmed/32769116 http://dx.doi.org/10.26508/lsa.202000718 Text en © 2020 MacEwen et al. https://creativecommons.org/licenses/by/4.0/This article is available under a Creative Commons License (Attribution 4.0 International, as described at https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Research Articles MacEwen, Melissa JS Markhard, Andrew L Bozbeyoglu, Mert Bradford, Forrest Goldberger, Olga Mootha, Vamsi K Sancak, Yasemin Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU |
title | Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU |
title_full | Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU |
title_fullStr | Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU |
title_full_unstemmed | Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU |
title_short | Evolutionary divergence reveals the molecular basis of EMRE dependence of the human MCU |
title_sort | evolutionary divergence reveals the molecular basis of emre dependence of the human mcu |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7425227/ https://www.ncbi.nlm.nih.gov/pubmed/32769116 http://dx.doi.org/10.26508/lsa.202000718 |
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