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- PDB-9sq0: Structure of trans-basal conformer of wild-type human CBS alone (... -

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Basic information

Entry
Database: PDB / ID: 9sq0
TitleStructure of trans-basal conformer of wild-type human CBS alone (internal aldemine)- by single particle approach
ComponentsCystathionine beta-synthase
KeywordsCYTOSOLIC PROTEIN / transsulfuration pathway / L-serine hydro-lyase / heme-binding protein / CBS domain
Function / homology
Function and homology information


Cysteine formation from homocysteine / L-homocysteine catabolic process / modified amino acid binding / cystathionine beta-synthase / cystathionine beta-synthase activity / L-serine catabolic process / Metabolism of ingested SeMet, Sec, MeSec into H2Se / : / carbon monoxide binding / hydrogen sulfide biosynthetic process ...Cysteine formation from homocysteine / L-homocysteine catabolic process / modified amino acid binding / cystathionine beta-synthase / cystathionine beta-synthase activity / L-serine catabolic process / Metabolism of ingested SeMet, Sec, MeSec into H2Se / : / carbon monoxide binding / hydrogen sulfide biosynthetic process / L-serine metabolic process / homocysteine metabolic process / L-cysteine catabolic process / L-cysteine biosynthetic process / transsulfuration / nitric oxide binding / : / DNA protection / S-adenosyl-L-methionine binding / nitrite reductase (NO-forming) activity / oxygen binding / response to nutrient levels / pyridoxal phosphate binding / cellular response to hypoxia / heme binding / ubiquitin protein ligase binding / negative regulation of apoptotic process / enzyme binding / protein homodimerization activity / metal ion binding / identical protein 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. / : / Pyridoxal-phosphate dependent enzyme / Pyridoxal-phosphate dependent enzyme / Tryptophan synthase beta subunit-like PLP-dependent enzyme / Domain in cystathionine beta-synthase and other proteins. / CBS domain superfamily ...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. / : / Pyridoxal-phosphate dependent enzyme / Pyridoxal-phosphate dependent enzyme / Tryptophan synthase beta subunit-like PLP-dependent enzyme / Domain in cystathionine beta-synthase and other proteins. / CBS domain superfamily / CBS domain / CBS domain / CBS domain profile.
Similarity search - Domain/homology
PROTOPORPHYRIN IX CONTAINING FE / Cystathionine beta-synthase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.74 Å
AuthorsInayathulla, M. / Tomas, M.
Funding support Switzerland, 1items
OrganizationGrant numberCountry
Swiss National Science FoundationCRSII5_177195 Switzerland
CitationJournal: Nat Commun / Year: 2026
Title: Structural basis for a filamentous morpheein model of human cystathionine beta-synthase
Authors: Mohammed, I. / Mijatovic, E. / Philipp, T.M. / Janickova, L. / Ascencao, K. / Asturias, F.J. / Martinez-Cruz, L.A. / Szabo, C. / Stahlberg, H. / Majtan, T.
History
DepositionSep 18, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 29, 2026Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Jul 29, 2026Data content type: Primary map / Data content type: Primary map / Provider: 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
hetero molecules


Theoretical massNumber of molelcules
Total (without water)123,0204
Polymers121,7872
Non-polymers1,2332
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Noncrystallographic symmetry (NCS)NCS domain:
IDEns-IDDetails (eV)
d_1ens_1chain "A"
d_2ens_1chain "B"

NCS domain segments:

Ens-ID: ens_1

Dom-IDComponent-IDBeg auth comp-IDBeg label comp-IDEnd auth comp-IDEnd label comp-IDAuth asym-IDLabel asym-IDAuth seq-IDLabel seq-ID
d_11LEULEUARGARGAA42 - 54842 - 548
d_12HEMHEMHEMHEMAC601
d_21LEULEUARGARGBB42 - 54842 - 548
d_22HEMHEMHEMHEMBD601

NCS oper: (Code: givenMatrix: (-0.999999995745, -8.97223499677E-5, -2.14563474941E-5), (-8.97191579133E-5, 0.999999984916, -0.00014872441717), (2.14696910747E-5, -0.000148722491492, -0.99999998871) ...NCS oper: (Code: given
Matrix: (-0.999999995745, -8.97223499677E-5, -2.14563474941E-5), (-8.97191579133E-5, 0.999999984916, -0.00014872441717), (2.14696910747E-5, -0.000148722491492, -0.99999998871)
Vector: 368.639796577, 0.0479147152913, 368.65273461)

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Components

#1: Protein Cystathionine beta-synthase / Beta-thionase / Serine sulfhydrase


Mass: 60893.500 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 BL21(DE3) (bacteria) / References: UniProt: P35520, cystathionine beta-synthase
#2: Chemical ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C34H32FeN4O4 / Feature type: SUBJECT OF INVESTIGATION
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

ComponentName: human CBS protein complex - dimer / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.4
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 72 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIXdev_5430model refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 2.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 200384 / Details: D1 symmetry imposed / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 27.96 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00248142
ELECTRON MICROSCOPYf_angle_d0.494111058
ELECTRON MICROSCOPYf_chiral_restr0.04131240
ELECTRON MICROSCOPYf_plane_restr0.0031414
ELECTRON MICROSCOPYf_dihedral_angle_d7.67181112
Refine LS restraints NCSType: NCS constraints / Rms dev position: 1.2462060413E-12 Å

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