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- PDB-6pk4: cryoEM structure of the substrate-bound human CTP synthase 2 filament -

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Basic information

Entry
Database: PDB / ID: 6pk4
TitlecryoEM structure of the substrate-bound human CTP synthase 2 filament
ComponentsCTP synthase 2CTP synthetase
KeywordsPROTEIN FIBRIL / Enzyme / filament
Function / homology
Function and homology information


cytoophidium / CTP synthase (glutamine hydrolysing) / CTP synthase activity / 'de novo' CTP biosynthetic process / pyrimidine nucleotide metabolic process / pyrimidine nucleobase biosynthetic process / CTP biosynthetic process / Interconversion of nucleotide di- and triphosphates / glutamine metabolic process / ATP binding ...cytoophidium / CTP synthase (glutamine hydrolysing) / CTP synthase activity / 'de novo' CTP biosynthetic process / pyrimidine nucleotide metabolic process / pyrimidine nucleobase biosynthetic process / CTP biosynthetic process / Interconversion of nucleotide di- and triphosphates / glutamine metabolic process / ATP binding / identical protein binding / cytosol / cytoplasm
Similarity search - Function
CTP synthase N-terminus / CTP synthase GATase domain / CTP synthase, N-terminal / CTP synthase / Glutamine amidotransferase type 1 domain profile. / Glutamine amidotransferase class-I / Glutamine amidotransferase / Class I glutamine amidotransferase (GATase) domain / Class I glutamine amidotransferase-like / P-loop containing nucleotide triphosphate hydrolases ...CTP synthase N-terminus / CTP synthase GATase domain / CTP synthase, N-terminal / CTP synthase / Glutamine amidotransferase type 1 domain profile. / Glutamine amidotransferase class-I / Glutamine amidotransferase / Class I glutamine amidotransferase (GATase) domain / Class I glutamine amidotransferase-like / P-loop containing nucleotide triphosphate hydrolases / P-loop containing nucleoside triphosphate hydrolase / Rossmann fold / 3-Layer(aba) Sandwich / Alpha Beta
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / URIDINE 5'-TRIPHOSPHATE / CTP synthase 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsLynch, E.M. / Kollman, J.M.
CitationJournal: Nat Struct Mol Biol / Year: 2020
Title: Coupled structural transitions enable highly cooperative regulation of human CTPS2 filaments.
Authors: Eric M Lynch / Justin M Kollman /
Abstract: Many enzymes assemble into defined oligomers, providing a mechanism for cooperatively regulating activity. Recent studies have described a mode of regulation in which enzyme activity is modulated by ...Many enzymes assemble into defined oligomers, providing a mechanism for cooperatively regulating activity. Recent studies have described a mode of regulation in which enzyme activity is modulated by polymerization into large-scale filaments. Here we describe an ultrasensitive form of polymerization-based regulation employed by human CTP synthase 2 (CTPS2). Cryo-EM structures reveal that CTPS2 filaments dynamically switch between active and inactive forms in response to changes in substrate and product levels. Linking the conformational state of many CTPS2 subunits in a filament results in highly cooperative regulation, greatly exceeding the limits of cooperativity for the CTPS2 tetramer alone. The structures reveal a link between conformation and control of ammonia channeling between the enzyme's active sites, and explain differences in regulation of human CTPS isoforms. This filament-based mechanism of enhanced cooperativity demonstrates how the widespread phenomenon of enzyme polymerization can be adapted to achieve different regulatory outcomes.
History
DepositionJun 28, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 25, 2019Provider: repository / Type: Initial release
Revision 1.1Jan 8, 2020Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Jan 22, 2020Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year / _citation_author.identifier_ORCID

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Assembly

Deposited unit
A: CTP synthase 2
B: CTP synthase 2
C: CTP synthase 2
D: CTP synthase 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)267,00312
Polymers263,0384
Non-polymers3,9658
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area20150 Å2
ΔGint-90 kcal/mol
Surface area86580 Å2
MethodPISA

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Components

#1: Protein
CTP synthase 2 / CTP synthetase / CTP synthetase 2 / UTP--ammonia ligase 2


Mass: 65759.430 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CTPS2 / Production host: Saccharomyces cerevisiae (baker's yeast)
References: UniProt: Q9NRF8, CTP synthase (glutamine hydrolysing)
#2: Chemical
ChemComp-UTP / URIDINE 5'-TRIPHOSPHATE / Uridine triphosphate


Mass: 484.141 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C9H15N2O15P3 / Comment: UTP*YM
#3: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE / Adenosine triphosphate


Mass: 507.181 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Comment: ATP, energy-carrying molecule*YM
Has ligand of interestN

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: substrate-bound CTP synthase 2 filament / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Saccharomyces cerevisiae (baker's yeast)
Buffer solutionpH: 7.9
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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 FIELDBright-field microscopy
Image recordingElectron dose: 90 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameCategory
1RELIONparticle selection
2Leginonimage acquisition
4GctfCTF correction
10RELIONinitial Euler assignment
11cisTEMfinal Euler assignment
13cisTEM3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: D2 (2x2 fold dihedral)
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 53964 / Symmetry type: POINT

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