6XQN

Structure of a mitochondrial calcium uniporter holocomplex (MICU1, MICU2, MCU, EMRE) in low Ca2+


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 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

Structures reveal gatekeeping of the mitochondrial Ca 2+ uniporter by MICU1-MICU2.

Wang, C.Jacewicz, A.Delgado, B.D.Baradaran, R.Long, S.B.

(2020) Elife 9

  • DOI: 10.7554/eLife.59991
  • Primary Citation of Related Structures:  
    6XQN, 6XQO

  • PubMed Abstract: 
  • The mitochondrial calcium uniporter is a Ca 2+ -gated ion channel complex that controls mitochondrial Ca 2+ entry and regulates cell metabolism. MCU and EMRE form the channel while Ca 2+ -dependent regulation is conferred by MICU1 and MICU2 through an enigmatic process ...

    The mitochondrial calcium uniporter is a Ca 2+ -gated ion channel complex that controls mitochondrial Ca 2+ entry and regulates cell metabolism. MCU and EMRE form the channel while Ca 2+ -dependent regulation is conferred by MICU1 and MICU2 through an enigmatic process. We present a cryo-EM structure of an MCU-EMRE-MICU1-MICU2 holocomplex comprising MCU and EMRE subunits from the beetle Tribolium castaneum in complex with a human MICU1-MICU2 heterodimer at 3.3 Å resolution. With analogy to how neuronal channels are blocked by protein toxins, a uniporter interaction domain on MICU1 binds to a channel receptor site comprising MCU and EMRE subunits to inhibit ion flow under resting Ca 2+ conditions. A Ca 2+ -bound structure of MICU1-MICU2 at 3.1 Å resolution indicates how Ca 2+ -dependent changes enable dynamic response to cytosolic Ca 2+ signals.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein EMRE homolog, mitochondrial-like ProteinA [auth E], D [auth G], F [auth H]70Tribolium castaneumMutation(s): 0 
Gene Names: TcasGA2_TC012057
Membrane Entity: Yes 
UniProt
Find proteins for D6X268 (Tribolium castaneum)
Explore D6X268 
Go to UniProtKB:  D6X268
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uniporter proteinB [auth A], C [auth B], E [auth C], G [auth D]203Tribolium castaneumMutation(s): 0 
Gene Names: TcasGA2_TC013837
Membrane Entity: Yes 
UniProt
Find proteins for D6WIX5 (Tribolium castaneum)
Explore D6WIX5 
Go to UniProtKB:  D6WIX5
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 1, mitochondrialH [auth I]394Homo sapiensMutation(s): 0 
Gene Names: MICU1CALCCBARA1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BPX6 (Homo sapiens)
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Go to UniProtKB:  Q9BPX6
PHAROS:  Q9BPX6
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Calcium uptake protein 2, mitochondrialI [auth J]383Homo sapiensMutation(s): 0 
Gene Names: MICU2EFHA1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IYU8 (Homo sapiens)
Explore Q8IYU8 
Go to UniProtKB:  Q8IYU8
PHAROS:  Q8IYU8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
J [auth B]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM131921
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP30CA008748

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-29
    Type: Initial release
  • Version 1.1: 2020-08-05
    Changes: Database references
  • Version 1.2: 2020-09-30
    Changes: Database references