6Z16

Structure of the Mrp antiporter complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.98 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Structure and mechanism of the Mrp complex, an ancient cation/proton antiporter.

Steiner, J.Sazanov, L.

(2020) Elife 9

  • DOI: 10.7554/eLife.59407
  • Primary Citation of Related Structures:  
    6Z16

  • PubMed Abstract: 
  • Multiple resistance and pH adaptation (Mrp) antiporters are multi-subunit Na + (or K + )/H + exchangers representing an ancestor of many essential redox-driven proton pumps, such as respiratory complex I. The mechanism of coupling between ion or electron transfer and proton translocation in this large protein family is unknown ...

    Multiple resistance and pH adaptation (Mrp) antiporters are multi-subunit Na + (or K + )/H + exchangers representing an ancestor of many essential redox-driven proton pumps, such as respiratory complex I. The mechanism of coupling between ion or electron transfer and proton translocation in this large protein family is unknown. Here, we present the structure of the Mrp complex from Anoxybacillus flavithermus solved by cryo-EM at 3.0 Å resolution. It is a dimer of seven-subunit protomers with 50 trans-membrane helices each. Surface charge distribution within each monomer is remarkably asymmetric, revealing probable proton and sodium translocation pathways. On the basis of the structure we propose a mechanism where the coupling between sodium and proton translocation is facilitated by a series of electrostatic interactions between a cation and key charged residues. This mechanism is likely to be applicable to the entire family of redox proton pumps, where electron transfer to substrates replaces cation movements.


    Organizational Affiliation

    Institute of Science and Technology Austria, Klosterneuburg, Austria.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, A subunitA,
H [auth a]
821Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpAAflv_1952
Membrane Entity: Yes 
UniProt
Find proteins for B7GL84 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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Go to UniProtKB:  B7GL84
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB7GL84
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, B subunitB,
I [auth b]
140Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpBAflv_1951
Membrane Entity: Yes 
UniProt
Find proteins for B7GL83 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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Go to UniProtKB:  B7GL83
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB7GL83
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, C subunitC,
J [auth c]
109Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpCAflv_1950
Membrane Entity: Yes 
UniProt
Find proteins for B7GL82 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB7GL82
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, D subunitD,
K [auth d]
490Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpDAflv_1949
Membrane Entity: Yes 
UniProt
Find proteins for B7GL98 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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UniProt GroupB7GL98
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, E subunitE,
L [auth e]
158Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpEAflv_1948
Membrane Entity: Yes 
UniProt
Find proteins for B7GL97 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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UniProt GroupB7GL97
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, F subunitF,
M [auth f]
91Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpFAflv_1947
Membrane Entity: Yes 
UniProt
Find proteins for B7GL96 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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UniProt GroupB7GL96
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Multisubunit Na+/H+ antiporter, G subunitG,
N [auth g]
119Anoxybacillus flavithermus WK1Mutation(s): 0 
Gene Names: mrpGAflv_1946
Membrane Entity: Yes 
UniProt
Find proteins for B7GIG3 (Anoxybacillus flavithermus (strain DSM 21510 / WK1))
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UniProt GroupB7GIG3
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Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PTY
Query on PTY

Download Ideal Coordinates CCD File 
AA [auth D],
BA [auth E],
CA [auth F],
DA [auth F],
EA [auth a],
AA [auth D],
BA [auth E],
CA [auth F],
DA [auth F],
EA [auth a],
FA [auth a],
GA [auth a],
HA [auth a],
IA [auth a],
JA [auth a],
KA [auth a],
NA [auth d],
O [auth A],
OA [auth d],
P [auth A],
PA [auth d],
Q [auth A],
QA [auth f],
R [auth A],
RA [auth f],
S [auth A],
T [auth A],
U [auth A],
W [auth B],
Y [auth D],
Z [auth D]
PHOSPHATIDYLETHANOLAMINE
C40 H80 N O8 P
NJGIRBISCGPRPF-KXQOOQHDSA-N
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
LA [auth a],
MA [auth c],
V [auth A],
X [auth C]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.98 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-12
    Type: Initial release