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- PDB-8s5l: Full-length human cystathionine beta-synthase, basal state, parti... -

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Basic information

Entry
Database: PDB / ID: 8s5l
TitleFull-length human cystathionine beta-synthase, basal state, partially degraded tetramer
Components(Cystathionine beta-synthaseCystathionine beta synthase) x 2
KeywordsTRANSFERASE / Filament / Allostery
Function / homology
Function and homology information


Cysteine formation from homocysteine / homocysteine catabolic process / modified amino acid binding / cystathionine beta-synthase / cystathionine beta-synthase activity / cysteine biosynthetic process via cystathionine / Metabolism of ingested SeMet, Sec, MeSec into H2Se / homocysteine metabolic process / L-serine catabolic process / carbon monoxide binding ...Cysteine formation from homocysteine / homocysteine catabolic process / modified amino acid binding / cystathionine beta-synthase / cystathionine beta-synthase activity / cysteine biosynthetic process via cystathionine / Metabolism of ingested SeMet, Sec, MeSec into H2Se / homocysteine metabolic process / L-serine catabolic process / carbon monoxide binding / hydrogen sulfide biosynthetic process / cartilage development involved in endochondral bone morphogenesis / L-serine metabolic process / regulation of nitric oxide mediated signal transduction / L-cysteine catabolic process / cysteine biosynthetic process / cerebellum morphogenesis / nitric oxide binding / cysteine biosynthetic process from serine / DNA protection / endochondral ossification / transsulfuration / S-adenosyl-L-methionine binding / response to folic acid / nitrite reductase (NO-forming) activity / superoxide metabolic process / maternal process involved in female pregnancy / blood vessel remodeling / blood vessel diameter maintenance / oxygen binding / pyridoxal phosphate binding / cellular response to hypoxia / ubiquitin protein ligase binding / heme binding / negative regulation of apoptotic process / enzyme binding / protein homodimerization activity / identical protein binding / metal ion binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Cystathionine beta-synthase, C-terminal domain / Cystathionine beta-synthase / Cysteine synthase/cystathionine beta-synthase, pyridoxal-phosphate attachment site / Cysteine synthase/cystathionine beta-synthase P-phosphate attachment site. / CBS domain superfamily / Domain in cystathionine beta-synthase and other proteins. / Pyridoxal-phosphate dependent enzyme / Tryptophan synthase beta subunit-like PLP-dependent enzyme / Pyridoxal-phosphate dependent enzyme / CBS domain ...Cystathionine beta-synthase, C-terminal domain / Cystathionine beta-synthase / Cysteine synthase/cystathionine beta-synthase, pyridoxal-phosphate attachment site / Cysteine synthase/cystathionine beta-synthase P-phosphate attachment site. / CBS domain superfamily / Domain in cystathionine beta-synthase and other proteins. / Pyridoxal-phosphate dependent enzyme / Tryptophan synthase beta subunit-like PLP-dependent enzyme / Pyridoxal-phosphate dependent enzyme / CBS domain / CBS domain / CBS domain profile.
Similarity search - Domain/homology
PROTOPORPHYRIN IX CONTAINING FE / PYRIDOXAL-5'-PHOSPHATE / Cystathionine beta-synthase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsMcCorvie, T.J. / Yue, W.W.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Wellcome Trust United Kingdom
CitationJournal: Nat Commun / Year: 2024
Title: Architecture and regulation of filamentous human cystathionine beta-synthase.
Authors: Thomas J McCorvie / Douglas Adamoski / Raquel A C Machado / Jiazhi Tang / Henry J Bailey / Douglas S M Ferreira / Claire Strain-Damerell / Arnaud Baslé / Andre L B Ambrosio / Sandra M G Dias / Wyatt W Yue /
Abstract: Cystathionine beta-synthase (CBS) is an essential metabolic enzyme across all domains of life for the production of glutathione, cysteine, and hydrogen sulfide. Appended to the conserved catalytic ...Cystathionine beta-synthase (CBS) is an essential metabolic enzyme across all domains of life for the production of glutathione, cysteine, and hydrogen sulfide. Appended to the conserved catalytic domain of human CBS is a regulatory domain that modulates activity by S-adenosyl-L-methionine (SAM) and promotes oligomerisation. Here we show using cryo-electron microscopy that full-length human CBS in the basal and SAM-bound activated states polymerises as filaments mediated by a conserved regulatory domain loop. In the basal state, CBS regulatory domains sterically block the catalytic domain active site, resulting in a low-activity filament with three CBS dimers per turn. This steric block is removed when in the activated state, one SAM molecule binds to the regulatory domain, forming a high-activity filament with two CBS dimers per turn. These large conformational changes result in a central filament of SAM-stabilised regulatory domains at the core, decorated with highly flexible catalytic domains. Polymerisation stabilises CBS and reduces thermal denaturation. In PC-3 cells, we observed nutrient-responsive CBS filamentation that disassembles when methionine is depleted and reversed in the presence of SAM. Together our findings extend our understanding of CBS enzyme regulation, and open new avenues for investigating the pathogenic mechanism and therapeutic opportunities for CBS-associated disorders.
History
DepositionFeb 23, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 17, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Cystathionine beta-synthase
B: Cystathionine beta-synthase
C: Cystathionine beta-synthase
D: Cystathionine beta-synthase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)246,42610
Polymers243,4664
Non-polymers2,9606
Water0
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 Cystathionine beta-synthase / Cystathionine beta synthase / Beta-thionase / Serine sulfhydrase


Mass: 60980.578 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CBS / Production host: Escherichia coli (E. coli) / References: UniProt: P35520, cystathionine beta-synthase
#2: Protein Cystathionine beta-synthase / Cystathionine beta synthase / Beta-thionase / Serine sulfhydrase


Mass: 60752.453 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CBS / Production host: Escherichia coli (E. coli) / References: UniProt: P35520, cystathionine beta-synthase
#3: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME / Heme B


Mass: 616.487 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C34H32FeN4O4
#4: Chemical ChemComp-PLP / PYRIDOXAL-5'-PHOSPHATE / VITAMIN B6 Phosphate / Pyridoxal phosphate


Mass: 247.142 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C8H10NO6P
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: Helical assembly of full-length human cystathionine beta-synthase in the basal state
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
Details: filter sterile 25 mM HEPES, pH 7.5, 200 mM NaCl, 2.0 mM TCEP, 0.005% (v/v) tween-20
Buffer component
IDConc.NameFormulaBuffer-ID
125 mMHEPES1
2200 mMsodium chlorideNaClSodium chloride1
32 mMTCEP1
40.005 % (v/v)Tween-201
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 150000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1400 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 5.18 sec. / Electron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2628

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Processing

EM software
IDNameVersionCategory
1cryoSPARC3.3.2particle selection
4cryoSPARC3.3.2CTF correction
7UCSF ChimeraXmodel fitting
9cryoSPARC3.3.2initial Euler assignment
10cryoSPARC3.3.2final Euler assignment
11cryoSPARC3.3.2classification
12cryoSPARC3.3.23D reconstruction
13PHENIXmodel refinement
14ISOLDEmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1190611
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 67901 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingB value: 64.75 / Protocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 4COO

4coo


Accession code: 4COO / Source name: PDB / Type: experimental model

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