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: MCUC10orf42CCDC109A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NE86 (Homo sapiens)
Explore Q8NE86 
Go to UniProtKB:  Q8NE86
PHAROS:  Q8NE86
Entity Groups  
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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: SMDT1C22orf32EMRE
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H4I9 (Homo sapiens)
Explore Q9H4I9 
Go to UniProtKB:  Q9H4I9
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: MICU1CALCCBARA1
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: MICU2EFHA1
Membrane Entity: Yes 
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Find proteins for Q8IYU8 (Homo sapiens)
Explore Q8IYU8 
Go to UniProtKB:  Q8IYU8
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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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