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- PDB-6que: Structure of ovine transhydrogenase in the presence of NADP+ in a... -

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Basic information

Entry
Database: PDB / ID: 6que
TitleStructure of ovine transhydrogenase in the presence of NADP+ in a "single face-down" conformation
ComponentsNicotinamide nucleotide transhydrogenase
KeywordsMEMBRANE PROTEIN / mitochondrial / proton-translocating / nicotinamide nucleotide transhydrogenase
Function / homology
Function and homology information


proton-translocating NAD(P)+ transhydrogenase activity / proton-translocating NAD(P)+ transhydrogenase / mitochondrial inner membrane / oxidoreductase activity / identical protein binding
Similarity search - Function
NAD(P) transhydrogenase, alpha subunit / NAD(P) transhydrogenase, alpha subunit, C-terminal / 4TM region of pyridine nucleotide transhydrogenase, mitoch / NADP transhydrogenase beta-like domain / NAD(P) transhydrogenase beta subunit / Alanine dehydrogenase/NAD(P) transhydrogenase, conserved site-1 / Alanine dehydrogenase & pyridine nucleotide transhydrogenase signature 1. / Alanine dehydrogenase/pyridine nucleotide transhydrogenase, conserved site-2 / Alanine dehydrogenase & pyridine nucleotide transhydrogenase signature 2. / Alanine dehydrogenase/PNT, C-terminal domain ...NAD(P) transhydrogenase, alpha subunit / NAD(P) transhydrogenase, alpha subunit, C-terminal / 4TM region of pyridine nucleotide transhydrogenase, mitoch / NADP transhydrogenase beta-like domain / NAD(P) transhydrogenase beta subunit / Alanine dehydrogenase/NAD(P) transhydrogenase, conserved site-1 / Alanine dehydrogenase & pyridine nucleotide transhydrogenase signature 1. / Alanine dehydrogenase/pyridine nucleotide transhydrogenase, conserved site-2 / Alanine dehydrogenase & pyridine nucleotide transhydrogenase signature 2. / Alanine dehydrogenase/PNT, C-terminal domain / Alanine dehydrogenase/pyridine nucleotide transhydrogenase, N-terminal / Alanine dehydrogenase/PNT, N-terminal domain / Alanine dehydrogenase/PNT, C-terminal domain / Alanine dehydrogenase/PNT, N-terminal domain / Alanine dehydrogenase/pyridine nucleotide transhydrogenase, NAD(H)-binding domain / DHS-like NAD/FAD-binding domain superfamily / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
NICOTINAMIDE-ADENINE-DINUCLEOTIDE / NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE / NAD(P) transhydrogenase, mitochondrial
Similarity search - Component
Biological speciesOvis aries (sheep)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsKampjut, D. / Sazanov, L.A.
Funding support Austria, 1items
OrganizationGrant numberCountry
European Union665385 Austria
CitationJournal: Nature / Year: 2019
Title: Structure and mechanism of mitochondrial proton-translocating transhydrogenase.
Authors: Domen Kampjut / Leonid A Sazanov /
Abstract: Proton-translocating transhydrogenase (also known as nicotinamide nucleotide transhydrogenase (NNT)) is found in the plasma membranes of bacteria and the inner mitochondrial membranes of eukaryotes. ...Proton-translocating transhydrogenase (also known as nicotinamide nucleotide transhydrogenase (NNT)) is found in the plasma membranes of bacteria and the inner mitochondrial membranes of eukaryotes. NNT catalyses the transfer of a hydride between NADH and NADP, coupled to the translocation of one proton across the membrane. Its main physiological function is the generation of NADPH, which is a substrate in anabolic reactions and a regulator of oxidative status; however, NNT may also fine-tune the Krebs cycle. NNT deficiency causes familial glucocorticoid deficiency in humans and metabolic abnormalities in mice, similar to those observed in type II diabetes. The catalytic mechanism of NNT has been proposed to involve a rotation of around 180° of the entire NADP(H)-binding domain that alternately participates in hydride transfer and proton-channel gating. However, owing to the lack of high-resolution structures of intact NNT, the details of this process remain unclear. Here we present the cryo-electron microscopy structure of intact mammalian NNT in different conformational states. We show how the NADP(H)-binding domain opens the proton channel to the opposite sides of the membrane, and we provide structures of these two states. We also describe the catalytically important interfaces and linkers between the membrane and the soluble domains and their roles in nucleotide exchange. These structures enable us to propose a revised mechanism for a coupling process in NNT that is consistent with a large body of previous biochemical work. Our results are relevant to the development of currently unavailable NNT inhibitors, which may have therapeutic potential in ischaemia reperfusion injury, metabolic syndrome and some cancers.
History
DepositionFeb 27, 2019Deposition site: PDBE / Processing site: PDBE
Revision 1.0Aug 28, 2019Provider: repository / Type: Initial release
Revision 1.1Sep 11, 2019Group: Data collection / Database references / Other / Category: cell / citation
Item: _cell.Z_PDB / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Sep 25, 2019Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Dec 18, 2019Group: Other / Category: atom_sites
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3]
Revision 1.4May 15, 2024Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

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Assembly

Deposited unit
A: Nicotinamide nucleotide transhydrogenase
B: Nicotinamide nucleotide transhydrogenase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)230,0315
Polymers227,9612
Non-polymers2,0703
Water00
1


  • Idetical with deposited unit
  • defined by software
  • Evidence: gel filtration, native gel electrophoresis
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area11890 Å2
ΔGint-94 kcal/mol
Surface area77930 Å2
MethodPISA

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Components

#1: Protein Nicotinamide nucleotide transhydrogenase


Mass: 113980.273 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Ovis aries (sheep) / References: UniProt: W5PFI3
#2: Chemical ChemComp-NAP / NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE / 2'-MONOPHOSPHOADENOSINE 5'-DIPHOSPHORIBOSE


Mass: 743.405 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C21H28N7O17P3
#3: Chemical ChemComp-NAD / NICOTINAMIDE-ADENINE-DINUCLEOTIDE


Mass: 663.425 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C21H27N7O14P2 / Comment: NAD*YM

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Nicotinamide nucleotide transhydrogenase in the presence of NADP+
Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightValue: 0.22 MDa / Experimental value: NO
Source (natural)Organism: Ovis aries (sheep)
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPES1
250 mMSodium chlorideNaCl1
31 mMEDTA1
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Sample was purified in LMNG (final conc. 0.06%) and contained 0.05% CHAPS as a secondary detergent as well as 5 mM NADP+.
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R0.6/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: 4-6 s blotting time

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10 sec. / Electron dose: 72 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2160
Image scansMovie frames/image: 40

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Processing

SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM software
IDNameVersionCategory
1RELION2.1particle selection
2EPUimage acquisition
4CTFFIND4.1.5CTF correction
7Coot0.8.9model fitting
9RELION2.1initial Euler assignment
10RELION3final Euler assignment
12RELION33D reconstruction
13PHENIX1.13model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1076677
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 58441 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingB value: 128.4 / Space: REAL
Atomic model buildingPDB-ID: 6QTI

6qti


Accession code: 6QTI / Source name: PDB / Type: experimental model

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