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- EMDB-0258: Cryo-EM structure of the KdpFABC complex in an E2 inward-facing s... -

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Basic information

Entry
Database: EMDB / ID: EMD-0258
TitleCryo-EM structure of the KdpFABC complex in an E2 inward-facing state (state 2)
Map data
Sample
  • Complex: KdpFABC
    • Protein or peptide: Potassium-transporting ATPase potassium-binding subunit
    • Protein or peptide: Potassium-transporting ATPase ATP-binding subunit
    • Protein or peptide: Potassium-transporting ATPase KdpC subunit
    • Protein or peptide: Potassium-transporting ATPase KdpF subunit
  • Ligand: POTASSIUM ION
KeywordsP-type ATPase superfamily of K+ transporters (SKT) potassium uptake system four subunit complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


P-type K+ transporter / P-type potassium transmembrane transporter activity / potassium:proton antiporter complex / potassium ion-transporting ATPase complex / monoatomic cation transmembrane transport / potassium ion binding / potassium ion transmembrane transport / potassium ion transport / magnesium ion binding / ATP hydrolysis activity ...P-type K+ transporter / P-type potassium transmembrane transporter activity / potassium:proton antiporter complex / potassium ion-transporting ATPase complex / monoatomic cation transmembrane transport / potassium ion binding / potassium ion transmembrane transport / potassium ion transport / magnesium ion binding / ATP hydrolysis activity / ATP binding / plasma membrane
Similarity search - Function
Potassium-transporting ATPase C chain / Potassium-transporting ATPase A chain / K+ transporting P-type ATPase, F subunit / K+-transporting ATPase, c chain / Potassium-transporting ATPase A subunit / F subunit of K+-transporting ATPase (Potass_KdpF) / P-type ATPase, B chain, subfamily IA / E1-E2 ATPase / P-type ATPase, haloacid dehalogenase domain / P-type ATPase, phosphorylation site ...Potassium-transporting ATPase C chain / Potassium-transporting ATPase A chain / K+ transporting P-type ATPase, F subunit / K+-transporting ATPase, c chain / Potassium-transporting ATPase A subunit / F subunit of K+-transporting ATPase (Potass_KdpF) / P-type ATPase, B chain, subfamily IA / E1-E2 ATPase / P-type ATPase, haloacid dehalogenase domain / P-type ATPase, phosphorylation site / P-type ATPase, cytoplasmic domain N / E1-E2 ATPases phosphorylation site. / P-type ATPase, A domain superfamily / P-type ATPase / P-type ATPase, transmembrane domain superfamily / haloacid dehalogenase-like hydrolase / HAD superfamily / HAD-like superfamily
Similarity search - Domain/homology
Potassium-transporting ATPase potassium-binding subunit / Potassium-transporting ATPase ATP-binding subunit / Potassium-transporting ATPase KdpC subunit / Potassium-transporting ATPase KdpF subunit
Similarity search - Component
Biological speciesEscherichia coli K-12 (bacteria) / Escherichia coli (strain K12) (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsStock C / Hielkema L
Funding support Germany, Netherlands, 3 items
OrganizationGrant numberCountry
German Research FoundationHA 6322/3-1 Germany
Netherlands Organisation for Scientific Research722.017.001 Netherlands
European Research Council749732 Netherlands
CitationJournal: Nat Commun / Year: 2018
Title: Cryo-EM structures of KdpFABC suggest a K transport mechanism via two inter-subunit half-channels.
Authors: C Stock / L Hielkema / I Tascón / D Wunnicke / G T Oostergetel / M Azkargorta / C Paulino / I Hänelt /
Abstract: P-type ATPases ubiquitously pump cations across biological membranes to maintain vital ion gradients. Among those, the chimeric K uptake system KdpFABC is unique. While ATP hydrolysis is accomplished ...P-type ATPases ubiquitously pump cations across biological membranes to maintain vital ion gradients. Among those, the chimeric K uptake system KdpFABC is unique. While ATP hydrolysis is accomplished by the P-type ATPase subunit KdpB, K has been assumed to be transported by the channel-like subunit KdpA. A first crystal structure uncovered its overall topology, suggesting such a spatial separation of energizing and transporting units. Here, we report two cryo-EM structures of the 157 kDa, asymmetric KdpFABC complex at 3.7 Å and 4.0 Å resolution in an E1 and an E2 state, respectively. Unexpectedly, the structures suggest a translocation pathway through two half-channels along KdpA and KdpB, uniting the alternating-access mechanism of actively pumping P-type ATPases with the high affinity and selectivity of K channels. This way, KdpFABC would function as a true chimeric complex, synergizing the best features of otherwise separately evolved transport mechanisms.
History
DepositionSep 26, 2018-
Header (metadata) releaseDec 5, 2018-
Map releaseDec 5, 2018-
UpdateNov 13, 2024-
Current statusNov 13, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0595
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.0595
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6hrb
  • Surface level: 0.0595
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_0258.png

Downloads & links

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Map

FileDownload / File: emd_0258.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.01 Å/pix.
x 240 pix.
= 242.88 Å		1.01 Å/pix.
x 240 pix.
= 242.88 Å		1.01 Å/pix.
x 240 pix.
= 242.88 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.012 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0595 / Movie #1: 0.0595
Minimum - Maximum-0.07844194 - 0.18261603
Average (Standard dev.)0.0012946029 (±0.008314866)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 242.87999 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0121.0121.012
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z242.880242.880242.880
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ450450450
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-0.0780.1830.001

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Supplemental data

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Mask #1

Fileemd_0258_msk_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Additional map: None

Fileemd_0258_additional.map
AnnotationNone
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map 1 used during refinement and for...

Fileemd_0258_half_map_1.map
Annotationhalf map 1 used during refinement and for FSC gold-standard resolution calculation KdpFABC state 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map 2 used during refinement and for...

Fileemd_0258_half_map_2.map
Annotationhalf map 2 used during refinement and for FSC gold-standard resolution calculation KdpFABC state 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : KdpFABC

EntireName: KdpFABC
Components
  • Complex: KdpFABC
    • Protein or peptide: Potassium-transporting ATPase potassium-binding subunit
    • Protein or peptide: Potassium-transporting ATPase ATP-binding subunit
    • Protein or peptide: Potassium-transporting ATPase KdpC subunit
    • Protein or peptide: Potassium-transporting ATPase KdpF subunit
  • Ligand: POTASSIUM ION

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Supramolecule #1: KdpFABC

SupramoleculeName: KdpFABC / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 157 KDa

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Macromolecule #1: Potassium-transporting ATPase potassium-binding subunit

MacromoleculeName: Potassium-transporting ATPase potassium-binding subunit
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (strain K12) (bacteria)
Molecular weightTheoretical: 59.218613 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MAAQGFLLIA TFLLVLMVLA RPLGSGLARL INDIPLPGTT GVERVLFRAL GVSDREMNWK QYLCAILGLN MLGLAVLFFM LLGQHYLPL NPQQLPGLSW DLALNTAVSF VTNTNWQSYS GETTLSYFSQ MAGLTVQNFL SAASGIAVIF ALIRAFTRQS M STLGNAWV ...String:
MAAQGFLLIA TFLLVLMVLA RPLGSGLARL INDIPLPGTT GVERVLFRAL GVSDREMNWK QYLCAILGLN MLGLAVLFFM LLGQHYLPL NPQQLPGLSW DLALNTAVSF VTNTNWQSYS GETTLSYFSQ MAGLTVQNFL SAASGIAVIF ALIRAFTRQS M STLGNAWV DLLRITLWVL VPVALLIALF FIQQGALQNF LPYQAVNTVE GAQQLLPMGP VASQEAIKML GTNGGGFFNA NS SHPFENP TALTNFVQML AIFLIPTALC FAFGEVMGDR RQGRMLLWAM SVIFVICVGV VMWAEVQGNP HLLALGTDSS INM EGKESR FGVLVSSLFA VVTTAASCGA VIAMHDSFTA LGGMVPMWLM QIGEVVFGGV GSGLYGMMLF VLLAVFIAGL MIGR TPEYL GKKIDVREMK LTALAILVTP TLVLMGAALA MMTDAGRSAM LNPGPHGFSE VLYAVSSAAN NNGSAFAGLS ANSPF WNCL LAFCMFVGRF GVIIPVMAIA GSLVSKKSQA ASSGTLPTHG PLFVGLLIGT VLLVGALTFI PALALGPVAE YLS

UniProtKB: Potassium-transporting ATPase potassium-binding subunit

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Macromolecule #2: Potassium-transporting ATPase ATP-binding subunit

MacromoleculeName: Potassium-transporting ATPase ATP-binding subunit / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO / EC number: ec: 3.6.3.12
Source (natural)Organism: Escherichia coli (strain K12) (bacteria)
Molecular weightTheoretical: 72.347844 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSRKQLALFE PTLVVQALKE AVKKLNPQAQ WRNPVMFIVW IGSLLTTCIS IAMASGAMPG NALFSAAISG WLWITVLFAN FAEALAEGR SKAQANSLKG VKKTAFARKL REPKYGAAAD KVPADQLRKG DIVLVEAGDI IPCDGEVIEG GASVDESAIT G E(SEP)APVIRE ...String:
MSRKQLALFE PTLVVQALKE AVKKLNPQAQ WRNPVMFIVW IGSLLTTCIS IAMASGAMPG NALFSAAISG WLWITVLFAN FAEALAEGR SKAQANSLKG VKKTAFARKL REPKYGAAAD KVPADQLRKG DIVLVEAGDI IPCDGEVIEG GASVDESAIT G E(SEP)APVIRE SGGDFASVTG GTRILSDWLV IECSVNPGET FLDRMIAMVE GAQRRKTPNE IALTILLIAL TIVFLLAT A TLWPFSAWGG NAVSVTVLVA LLVCLIPTTI GGLLSAIGVA GMSRMLGANV IATSGRAVEA AGDVDVLLLD KTGTITLGN RQASEFIPAQ GVDEKTLADA AQLASLADET PEGRSIVILA KQRFNLRERD VQSLHATFVP FTAQSRMSGI NIDNRMIRKG SVDAIRRHV EANGGHFPTD VDQKVDQVAR QGATPLVVVE GSRVLGVIAL KDIVKGGIKE RFAQLRKMGI KTVMITGDNR L TAAAIAAE AGVDDFLAEA TPEAKLALIR QYQAEGRLVA MTGDGTNDAP ALAQADVAVA MNSGTQAAKE AGNMVDLDSN PT KLIEVVH IGKQMLMTRG SLTTFSIAND VAKYFAIIPA AFAATYPQLN ALNIMCLHSP DSAILSAVIF NALIIVFLIP LAL KGVSYK PLTASAMLRR NLWIYGLGGL LVPFIGIKVI DLLLTVCGLV

UniProtKB: Potassium-transporting ATPase ATP-binding subunit

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Macromolecule #3: Potassium-transporting ATPase KdpC subunit

MacromoleculeName: Potassium-transporting ATPase KdpC subunit / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (strain K12) (bacteria)
Molecular weightTheoretical: 20.281035 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSGLRPALST FIFLLLITGG VYPLLTTVLG QWWFPWQANG SLIREGDTVR GSALIGQNFT GNGYFHGRPS ATAEMPYNPQ ASGGSNLAV SNPELDKLIA ARVAALRAAN PDASASVPVE LVTASASGLD NNITPQAAAW QIPRVAKARN LSVEQLTQLI A KYSQQPLV KYIGQPVVNI VELNLALDKL DE

UniProtKB: Potassium-transporting ATPase KdpC subunit

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Macromolecule #4: Potassium-transporting ATPase KdpF subunit

MacromoleculeName: Potassium-transporting ATPase KdpF subunit / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (strain K12) (bacteria) / Strain: K12
Molecular weightTheoretical: 3.071714 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSAGVITGVL LVFLLLGYLV YALINAEAF

UniProtKB: Potassium-transporting ATPase KdpF subunit

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Macromolecule #5: POTASSIUM ION

MacromoleculeName: POTASSIUM ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: K
Molecular weightTheoretical: 39.098 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration3.1 mg/mL
BufferpH: 8
Details: 10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.012% DDM
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec. / Details: at 5 mA
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 293 K / Instrument: FEI VITROBOT MARK III

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
TemperatureMin: 90.0 K / Max: 105.0 K
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Digitization - Frames/image: 1-60 / Number grids imaged: 9 / Number real images: 7327 / Average exposure time: 9.0 sec. / Average electron dose: 52.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Calibrated defocus max: 3.0 µm / Calibrated defocus min: 0.3 µm / Calibrated magnification: 49407 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.3 µm / Nominal magnification: 49407
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 826403
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

5mrw

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.1b) / Number images used: 104786
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 2.1b)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 2.1b)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

5mrw


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL
Output model

PDB-6hrb:
Cryo-EM structure of the KdpFABC complex in an E2 inward-facing state (state 2)

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