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- PDB-6l6z: Cryo-EM structure of the Drosophila CTP synthase substrate-bound ... -

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Basic information

Entry
Database: PDB / ID: 6l6z
TitleCryo-EM structure of the Drosophila CTP synthase substrate-bound filament
ComponentsCTP synthaseCTP synthetase
KeywordsLIGASE / substrate-bound / filament
Function / homology
Function and homology information


Interconversion of nucleotide di- and triphosphates / larval lymph gland hemopoiesis / cytoophidium / CTP synthase (glutamine hydrolysing) / CTP synthase activity / 'de novo' CTP biosynthetic process / pyrimidine nucleobase biosynthetic process / CTP biosynthetic process / glutamine metabolic process / ATP binding ...Interconversion of nucleotide di- and triphosphates / larval lymph gland hemopoiesis / cytoophidium / CTP synthase (glutamine hydrolysing) / CTP synthase activity / 'de novo' CTP biosynthetic process / pyrimidine nucleobase biosynthetic process / CTP biosynthetic process / glutamine metabolic process / ATP binding / identical protein binding / cytosol / cytoplasm
Similarity search - Function
CTP synthase / CTP synthase, N-terminal / CTP synthase GATase domain / CTP synthase N-terminus / Glutamine amidotransferase class-I / Glutamine amidotransferase / Glutamine amidotransferase type 1 domain profile. / Class I glutamine amidotransferase-like / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Biological speciesDrosophila melanogaster (fruit fly)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 6.09 Å
AuthorsJi-Long, L. / Xian, Z. / Chen-Jun, G.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China China
CitationJournal: J Genet Genomics / Year: 2019
Title: Drosophila CTP synthase can form distinct substrate- and product-bound filaments.
Authors: Xian Zhou / Chen-Jun Guo / Huan-Huan Hu / Jiale Zhong / Qianqian Sun / Dandan Liu / Shuang Zhou / Chia Chun Chang / Ji-Long Liu /
Abstract: Intracellular compartmentation is a key strategy for the functioning of a cell. In 2010, several studies revealed that the metabolic enzyme CTP synthase (CTPS) can form filamentous structures termed ...Intracellular compartmentation is a key strategy for the functioning of a cell. In 2010, several studies revealed that the metabolic enzyme CTP synthase (CTPS) can form filamentous structures termed cytoophidia in prokaryotic and eukaryotic cells. However, recent structural studies showed that CTPS only forms inactive product-bound filaments in bacteria while forming active substrate-bound filaments in eukaryotic cells. In this study, using negative staining and cryo-electron microscopy, we demonstrate that Drosophila CTPS, whether in substrate-bound or product-bound form, can form filaments. Our results challenge the previous model and indicate that substrate-bound and product-bound filaments can coexist in the same species. We speculate that the ability to switch between active and inactive cytoophidia in the same cells provides an additional layer of metabolic regulation.
History
DepositionOct 30, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 18, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 27, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
D: CTP synthase
A: CTP synthase
B: CTP synthase
C: CTP synthase
H: CTP synthase
E: CTP synthase
F: CTP synthase
G: CTP synthase


Theoretical massNumber of molelcules
Total (without water)504,9488
Polymers504,9488
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area26020 Å2
ΔGint-146 kcal/mol
Surface area194480 Å2

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Components

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


Mass: 63118.480 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Drosophila melanogaster (fruit fly) / Gene: CTPsyn, CG45070
Production host: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
References: UniProt: Q9VUL1, CTP synthase (glutamine hydrolysing)

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Drosophila substrate-bound CTP synthase / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Source (recombinant)Organism: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
Buffer solutionpH: 7.5
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: DARK FIELD
Image recordingElectron dose: 45 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: 55.7 ° / Axial rise/subunit: 103 Å / Axial symmetry: D2
3D reconstructionResolution: 6.09 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 123455 / Symmetry type: HELICAL

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