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- PDB-8ul9: Cholinephosphotransferase in complex with diacylglycerol -

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Basic information

Entry
Database: PDB / ID: 8ul9
TitleCholinephosphotransferase in complex with diacylglycerol
ComponentsCholinephosphotransferase 1
KeywordsMEMBRANE PROTEIN / lipid metabolism / phospholipid synthesis / membrane protein enzyme / choline metabolism
Function / homology
Function and homology information


Synthesis of PC / Synthesis of PE / diacylglycerol cholinephosphotransferase / diacylglycerol cholinephosphotransferase activity / CDP-choline pathway / mitochondrial outer membrane / endoplasmic reticulum membrane / endoplasmic reticulum / Golgi apparatus / metal ion binding
Similarity search - Function
Choline/ethanolamine phosphotransferase / CDP-alcohol phosphatidyltransferase / CDP-alcohol phosphatidyltransferase, transmembrane domain / : / CDP-alcohol phosphatidyltransferase / CDP-alcohol phosphatidyltransferases signature.
Similarity search - Domain/homology
DIACYL GLYCEROL / 1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Cholinephosphotransferase 1
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsRoberts, J.R. / Maeda, S. / Ohi, M.D.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2025
Title: Structural basis for catalysis and selectivity of phospholipid synthesis by eukaryotic choline-phosphotransferase.
Authors: Jacquelyn R Roberts / Yasuhiro Horibata / Frank E Kwarcinski / Vinson Lam / Ashleigh M Raczkowski / Akane Hubbard / Betsy White / Hiroyuki Sugimoto / Gregory G Tall / Melanie D Ohi / Shoji Maeda /
Abstract: Phospholipids are the most abundant component in lipid membranes and are essential for the structural and functional integrity of the cell. In eukaryotic cells, phospholipids are primarily ...Phospholipids are the most abundant component in lipid membranes and are essential for the structural and functional integrity of the cell. In eukaryotic cells, phospholipids are primarily synthesized de novo through the Kennedy pathway that involves multiple enzymatic processes. The terminal reaction is mediated by a group of cytidine-5'-diphosphate (CDP)-choline /CDP-ethanolamine-phosphotransferases (CPT/EPT) that use 1,2-diacylglycerol (DAG) and CDP-choline or CDP-ethanolamine to produce phosphatidylcholine (PC) or phosphatidylethanolamine (PE) that are the main phospholipids in eukaryotic cells. Here we present the structure of the yeast CPT1 in multiple substrate-bound states. Structural and functional analysis of these binding-sites reveal the critical residues for the DAG acyl-chain preference and the choline/ethanolamine selectivity. Additionally, we present the structure in complex with a potent inhibitor characterized in this study. The ensemble of structures allows us to propose the reaction mechanism for phospholipid biosynthesis by the family of CDP-alcohol phosphotransferases (CDP-APs).
History
DepositionOct 16, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 23, 2024Provider: repository / Type: Initial release
Revision 1.1Nov 20, 2024Group: Data collection / Category: em_admin / Item: _em_admin.last_update
Revision 1.2Jan 15, 2025Group: Data collection / Database references / Structure summary
Category: citation / citation_author ...citation / citation_author / em_admin / struct
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update / _em_admin.title / _struct.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cholinephosphotransferase 1
B: Cholinephosphotransferase 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)94,36514
Polymers88,2952
Non-polymers6,07012
Water181
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Cholinephosphotransferase 1


Mass: 44147.277 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: CPT1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P17898
#2: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg
#3: Chemical
ChemComp-PCW / 1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / (Z,Z)-4-HYDROXY-N,N,N-TRIMETHYL-10-OXO-7-[(1-OXO-9-OCTADECENYL)OXY]-3,5,9-TRIOXA-4-PHOSPHAHEPTACOS-18-EN-1-AMINIUM-4-OXIDE


Mass: 787.121 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C44H85NO8P / Comment: DOPC, phospholipid*YM
#4: Chemical ChemComp-DGA / DIACYL GLYCEROL


Mass: 625.018 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C39H76O5 / Feature type: SUBJECT OF INVESTIGATION
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationY

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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

Component
IDNameTypeEntity IDParent-IDSource
1Saccharomyces cerevisiae CDP-choline phosphotransferase in complex with diacyl-glycerolCOMPLEX#10RECOMBINANT
2nanobody24COMPLEX1RECOMBINANT
3yCPT1COMPLEX#11RECOMBINANT
Molecular weight
IDEntity assembly-IDExperimental value
11NO
21NO
31NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Saccharomyces cerevisiae (brewer's yeast)4932
32Lama glama (llama)9844
43Saccharomyces cerevisiae (brewer's yeast)4932
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDStrain
21Spodoptera frugiperda (fall armyworm)7108
32Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)866768Rosetta
43Spodoptera frugiperda (fall armyworm)7108
Buffer solutionpH: 7.5
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: NITROGEN

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2400 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: SerialEM / Category: image acquisition
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 677515 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0046868
ELECTRON MICROSCOPYf_angle_d0.4819282
ELECTRON MICROSCOPYf_dihedral_angle_d13.5852483
ELECTRON MICROSCOPYf_chiral_restr0.0391004
ELECTRON MICROSCOPYf_plane_restr0.0041113

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