6XJV

MCU holocomplex in High-calcium state

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.17 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structural insights into the Ca 2+ -dependent gating of the human mitochondrial calcium uniporter.

Wang, Y., Han, Y., She, J., Nguyen, N.X., Mootha, V.K., Bai, X.C., Jiang, Y.

(2020) Elife 9

  • DOI: 10.7554/eLife.60513
  • Primary Citation of Related Structures:  
    6XJV, 6XJX

  • PubMed Abstract: 

    • Mitochondrial Ca 2+ uptake is mediated by an inner mitochondrial membrane protein called the mitochondrial calcium uniporter. In humans, the uniporter functions as a holocomplex consisting of MCU, EMRE, MICU1 and MICU2, among which MCU and EMRE form a subcomplex and function as the conductive channel while MICU1 and MICU2 are EF-hand proteins that regulate the channel activity in a Ca 2+ -dependent manner ...

    Mitochondrial Ca 2+ uptake is mediated by an inner mitochondrial membrane protein called the mitochondrial calcium uniporter. In humans, the uniporter functions as a holocomplex consisting of MCU, EMRE, MICU1 and MICU2, among which MCU and EMRE form a subcomplex and function as the conductive channel while MICU1 and MICU2 are EF-hand proteins that regulate the channel activity in a Ca 2+ -dependent manner. Here, we present the EM structures of the human mitochondrial calcium uniporter holocomplex (uniplex) in the presence and absence of Ca 2+ , revealing distinct Ca 2+ dependent assembly of the uniplex. Our structural observations suggest that Ca 2+ changes the dimerization interaction between MICU1 and MICU2, which in turn determines how the MICU1-MICU2 subcomplex interacts with the MCU-EMRE channel and, consequently, changes the distribution of the uniplex assemblies between the blocked and unblocked states.

    Organizational Affiliation: 

    Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uniporter protein, mitochondrial351Homo sapiensMutation(s): 0 
Gene Names: MCU, C10orf42, CCDC109A
Membrane Entity: Yes 
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Find proteins for Q8NE86 (Homo sapiens)
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PHAROS:  Q8NE86
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UniProt GroupQ8NE86
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Essential MCU regulator, mitochondrial107Homo sapiensMutation(s): 0 
Gene Names: SMDT1, C22orf32, EMRE
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H4I9 (Homo sapiens)
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PHAROS:  Q9H4I9
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UniProt GroupQ9H4I9
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 1, mitochondrialI [auth Q],
S		476Homo sapiensMutation(s): 0 
Gene Names: MICU1, CALC, CBARA1
Membrane Entity: Yes 
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Find proteins for Q9BPX6 (Homo sapiens)
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PHAROS:  Q9BPX6
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UniProt GroupQ9BPX6
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 2, mitochondrialJ [auth R],
T		434Homo sapiensMutation(s): 0 
Gene Names: MICU2, EFHA1
Membrane Entity: Yes 
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Find proteins for Q8IYU8 (Homo sapiens)
Explore Q8IYU8 
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PHAROS:  Q8IYU8
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UniProt GroupQ8IYU8
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.17 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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View more in-depth experimental data

Entry History & Funding Information

Deposition Data

  • Deposited Date: 2020-06-24 
  • Released Date: 2020-09-09 
    • Deposition Author(s): Wang, Y., Jiang, Y.
Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-09
    Type: Initial release
  • Version 1.1: 2020-09-16
    Changes: Database references
  • Version 1.2: 2020-09-30
    Changes: Database references