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- EMDB-23859: Mouse CTPS1 bound to inhibitor R80 -

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Basic information

Entry
Database: EMDB / ID: EMD-23859
TitleMouse CTPS1 bound to inhibitor R80
Map dataMouse CTPS1 bound to inhibitor R80
Sample
  • Complex: mCTPS1 tetramer
    • Protein or peptide: CTP synthase 1
  • Ligand: GLUTAMINE
  • Ligand: MAGNESIUM ION
  • Ligand: URIDINE 5'-TRIPHOSPHATE
  • Ligand: N-(1-{2-[(cyclopropanesulfonyl)amino]-1,3-thiazol-4-yl}cyclopropyl)-5-(6-ethoxypyrazin-2-yl)pyridine-2-carboxamide
Function / homology
Function and homology information


Interconversion of nucleotide di- and triphosphates / CTP synthase activity / cytoophidium / CTP synthase (glutamine hydrolysing) / 'de novo' CTP biosynthetic process / pyrimidine nucleobase biosynthetic process / B cell proliferation / CTP biosynthetic process / glutamine metabolic process / T cell proliferation ...Interconversion of nucleotide di- and triphosphates / CTP synthase activity / cytoophidium / CTP synthase (glutamine hydrolysing) / 'de novo' CTP biosynthetic process / pyrimidine nucleobase biosynthetic process / B cell proliferation / CTP biosynthetic process / glutamine metabolic process / T cell proliferation / 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-like / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Biological speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.4 Å
AuthorsLynch EM / Dimattia MA / Kollman JM
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM118396 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Structural basis for isoform-specific inhibition of human CTPS1.
Authors: Eric M Lynch / Michael A DiMattia / Steven Albanese / Gydo C P van Zundert / Jesse M Hansen / Joel D Quispe / Madison A Kennedy / Andreas Verras / Kenneth Borrelli / Angela V Toms / Neelu ...Authors: Eric M Lynch / Michael A DiMattia / Steven Albanese / Gydo C P van Zundert / Jesse M Hansen / Joel D Quispe / Madison A Kennedy / Andreas Verras / Kenneth Borrelli / Angela V Toms / Neelu Kaila / Kevin D Kreutter / Joshua J McElwee / Justin M Kollman /
Abstract: Cytidine triphosphate synthase 1 (CTPS1) is necessary for an effective immune response, as revealed by severe immunodeficiency in CTPS1-deficient individuals [E. Martin ], [] [510], [288-292] ([2014]) ...Cytidine triphosphate synthase 1 (CTPS1) is necessary for an effective immune response, as revealed by severe immunodeficiency in CTPS1-deficient individuals [E. Martin ], [] [510], [288-292] ([2014]). CTPS1 expression is up-regulated in activated lymphocytes to expand CTP pools [E. Martin ], [] [510], [288-292] ([2014]), satisfying increased demand for nucleic acid and lipid synthesis [L. D. Fairbanks, M. Bofill, K. Ruckemann, H. A. Simmonds], [ ] [270], [29682-29689] ([1995]). Demand for CTP in other tissues is met by the CTPS2 isoform and nucleoside salvage pathways [E. Martin ], [] [510], [288-292] ([2014]). Selective inhibition of the proliferative CTPS1 isoform is therefore desirable in the treatment of immune disorders and lymphocyte cancers, but little is known about differences in regulation of the isoforms or mechanisms of known inhibitors. We show that CTP regulates both isoforms by binding in two sites that clash with substrates. CTPS1 is less sensitive to CTP feedback inhibition, consistent with its role in increasing CTP levels in proliferation. We also characterize recently reported small-molecule inhibitors, both CTPS1 selective and nonselective. Cryo-electron microscopy (cryo-EM) structures reveal these inhibitors mimic CTP binding in one inhibitory site, where a single amino acid substitution explains selectivity for CTPS1. The inhibitors bind to CTPS assembled into large-scale filaments, which for CTPS1 normally represents a hyperactive form of the enzyme [E. M. Lynch ], [] [24], [507-514] ([2017]). This highlights the utility of cryo-EM in drug discovery, particularly for cases in which targets form large multimeric assemblies not amenable to structure determination by other techniques. Both inhibitors also inhibit the proliferation of human primary T cells. The mechanisms of selective inhibition of CTPS1 lay the foundation for the design of immunosuppressive therapies.
History
DepositionApr 17, 2021-
Header (metadata) releaseOct 13, 2021-
Map releaseOct 13, 2021-
UpdateOct 13, 2021-
Current statusOct 13, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 1.4
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 1.4
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7mip
  • Surface level: 1.4
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_23859.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMouse CTPS1 bound to inhibitor R80
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesX (Sec.)Y (Row.)Z (Col.)
1.05 Å/pix.
x 300 pix.
= 315. Å
1.05 Å/pix.
x 300 pix.
= 315. Å
1.05 Å/pix.
x 300 pix.
= 315. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.05 Å
Density
Contour LevelBy AUTHOR: 1.4 / Movie #1: 1.4
Minimum - Maximum-7.800124 - 16.308231
Average (Standard dev.)-6.1096706e-13 (±0.26297352)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 315.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.051.051.05
M x/y/z300300300
origin x/y/z0.0000.0000.000
length x/y/z315.000315.000315.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ300300300
MAP C/R/S321
start NC/NR/NS000
NC/NR/NS300300300
D min/max/mean-7.80016.308-0.000

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Supplemental data

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Sample components

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Entire : mCTPS1 tetramer

EntireName: mCTPS1 tetramer
Components
  • Complex: mCTPS1 tetramer
    • Protein or peptide: CTP synthase 1
  • Ligand: GLUTAMINE
  • Ligand: MAGNESIUM ION
  • Ligand: URIDINE 5'-TRIPHOSPHATE
  • Ligand: N-(1-{2-[(cyclopropanesulfonyl)amino]-1,3-thiazol-4-yl}cyclopropyl)-5-(6-ethoxypyrazin-2-yl)pyridine-2-carboxamide

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Supramolecule #1: mCTPS1 tetramer

SupramoleculeName: mCTPS1 tetramer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Mus musculus (house mouse)
Recombinant expressionOrganism: Homo sapiens (human)

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Macromolecule #1: CTP synthase 1

MacromoleculeName: CTP synthase 1 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO / EC number: CTP synthase (glutamine hydrolysing)
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 66.770398 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MKYILVTGGV ISGIGKGVIA SSVGTILKSC GLHVTSIKID PYINIDAGTF SPYEHGEVFV LDDGGEVDLD LGNYERFLDI RLTKDNNLT TGKIYQYVIN KERKGDYLGK TVQVVPHITD AIQEWVMRQA LIPVDEDGLE PQVCVIELGG TVGDIESMPF I EAFRQFQF ...String:
MKYILVTGGV ISGIGKGVIA SSVGTILKSC GLHVTSIKID PYINIDAGTF SPYEHGEVFV LDDGGEVDLD LGNYERFLDI RLTKDNNLT TGKIYQYVIN KERKGDYLGK TVQVVPHITD AIQEWVMRQA LIPVDEDGLE PQVCVIELGG TVGDIESMPF I EAFRQFQF KVKRENFCNI HVSLVPQPSS TGEQKTKPTQ NSVRELRGLG LSPDLVVCRC SNPLDTSVKE KISMFCHVEP EQ VICVHDV SSIYRVPLLL EEQGVVDYFL RRLDLPIERQ SRKMLMKWKE MADRYDRLLE TCSIALVGKY TKFSDSYASV IKA LEHSAL AINHKLEIKY IDSTDLEPST LQEEPVRYHE AWQKLCSAHG VLVPGGFGVR GTEGKIQAIA WARKQKKPFL GVCL GMQLA VVEFSRNVLG WQDANSTEFD PKTSHPVVID MPEHNPGQMG GTMRLGKRRT LFQTKNSVMR KLYGDTDYLE ERHRH RFEV NPVLKKCLEE QGLKFVGQDV EGERMEIVEL EDHPFFVGVQ YHPEFLSRPI KPSPPYFGLL LASVGRLPHY LQKGCR LSP RDTYSDRSGS SSPDSEITEL KFPSISQD

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Macromolecule #2: GLUTAMINE

MacromoleculeName: GLUTAMINE / type: ligand / ID: 2 / Number of copies: 4 / Formula: GLN
Molecular weightTheoretical: 146.144 Da
Chemical component information

ChemComp-GLN:
GLUTAMINE / Glutamine

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Macromolecule #3: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 4 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #4: URIDINE 5'-TRIPHOSPHATE

MacromoleculeName: URIDINE 5'-TRIPHOSPHATE / type: ligand / ID: 4 / Number of copies: 4 / Formula: UTP
Molecular weightTheoretical: 484.141 Da
Chemical component information

ChemComp-UTP:
URIDINE 5'-TRIPHOSPHATE / UTP*YM / Uridine triphosphate

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Macromolecule #5: N-(1-{2-[(cyclopropanesulfonyl)amino]-1,3-thiazol-4-yl}cyclopropy...

MacromoleculeName: N-(1-{2-[(cyclopropanesulfonyl)amino]-1,3-thiazol-4-yl}cyclopropyl)-5-(6-ethoxypyrazin-2-yl)pyridine-2-carboxamide
type: ligand / ID: 5 / Number of copies: 4 / Formula: ZG4
Molecular weightTheoretical: 486.567 Da
Chemical component information

ChemComp-ZG4:
N-(1-{2-[(cyclopropanesulfonyl)amino]-1,3-thiazol-4-yl}cyclopropyl)-5-(6-ethoxypyrazin-2-yl)pyridine-2-carboxamide

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation statefilament

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Sample preparation

BufferpH: 7.9
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 90.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND (ver. 4)
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final reconstructionApplied symmetry - Point group: D2 (2x2 fold dihedral) / Resolution.type: BY AUTHOR / Resolution: 2.4 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 238267

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