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TitleA subgroup of light-driven sodium pumps with an additional Schiff base counterion.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 3119, Year 2024
Publish dateApr 10, 2024
AuthorsE Podoliak / G H U Lamm / E Marin / A V Schellbach / D A Fedotov / A Stetsenko / M Asido / N Maliar / G Bourenkov / T Balandin / C Baeken / R Astashkin / T R Schneider / A Bateman / J Wachtveitl / I Schapiro / V Busskamp / A Guskov / V Gordeliy / A Alekseev / K Kovalev /
PubMed AbstractLight-driven sodium pumps (NaRs) are unique ion-transporting microbial rhodopsins. The major group of NaRs is characterized by an NDQ motif and has two aspartic acid residues in the central region ...Light-driven sodium pumps (NaRs) are unique ion-transporting microbial rhodopsins. The major group of NaRs is characterized by an NDQ motif and has two aspartic acid residues in the central region essential for sodium transport. Here we identify a subgroup of the NDQ rhodopsins bearing an additional glutamic acid residue in the close vicinity to the retinal Schiff base. We thoroughly characterize a member of this subgroup, namely the protein ErNaR from Erythrobacter sp. HL-111 and show that the additional glutamic acid results in almost complete loss of pH sensitivity for sodium-pumping activity, which is in contrast to previously studied NaRs. ErNaR is capable of transporting sodium efficiently even at acidic pH levels. X-ray crystallography and single particle cryo-electron microscopy reveal that the additional glutamic acid residue mediates the connection between the other two Schiff base counterions and strongly interacts with the aspartic acid of the characteristic NDQ motif. Hence, it reduces its pKa. Our findings shed light on a subgroup of NaRs and might serve as a basis for their rational optimization for optogenetics.
External linksNat Commun / PubMed:38600129 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution1.7 - 2.63 Å
Structure data

18609

8qqz

EMDB-18609, PDB-8qqz:
Cryo-EM structure of the light-driven sodium pump ErNaR in the pentameric form at pH 8.0
Method: EM (single particle) / Resolution: 2.63 Å

18610

8qr0

EMDB-18610, PDB-8qr0:
Cryo-EM structure of the light-driven sodium pump ErNaR in the pentameric form at pH 4.3
Method: EM (single particle) / Resolution: 2.5 Å

PDB-8qle:
Crystal structure of the light-driven sodium pump ErNaR in the monomeric form at pH 4.6
Method: X-RAY DIFFRACTION / Resolution: 1.7 Å

PDB-8qlf:
Crystal structure of the light-driven sodium pump ErNaR in the monomeric form at pH 8.8
Method: X-RAY DIFFRACTION / Resolution: 1.71 Å

Chemicals

ChemComp-LFA:
EICOSANE

ChemComp-OLA:
OLEIC ACID

ChemComp-HOH:
WATER

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

Source
  • erythrobacter (bacteria)
KeywordsMEMBRANE PROTEIN / retinal / ion transport / rhodopsin / photocycle / sodium transport

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