8S5H

Full-length human cystathionine beta-synthase with C-terminal 6xHis-tag, basal state, helical reconstruction


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Architecture and regulation of filamentous human cystathionine beta-synthase.

McCorvie, T.J.Adamoski, D.Machado, R.A.C.Tang, J.Bailey, H.J.Ferreira, D.S.M.Strain-Damerell, C.Basle, A.Ambrosio, A.L.B.Dias, S.M.G.Yue, W.W.

(2024) Nat Commun 15: 2931-2931

  • DOI: https://doi.org/10.1038/s41467-024-46864-x
  • Primary Citation of Related Structures:  
    8S5H, 8S5I, 8S5J, 8S5K, 8S5L, 8S5M

  • PubMed 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 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.


  • Organizational Affiliation

    Nuffield Department of Clinical Medicine, Centre for Medicines Discovery, University of Oxford, Oxford, OX3 7DQ, UK. thomas.mccorvie@newcastle.ac.uk.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cystathionine beta-synthase
A, B, C, D, E
A, B, C, D, E, F, G, H
559Homo sapiensMutation(s): 0 
Gene Names: CBS
EC: 4.2.1.22
UniProt & NIH Common Fund Data Resources
Find proteins for P35520 (Homo sapiens)
Explore P35520 
Go to UniProtKB:  P35520
PHAROS:  P35520
GTEx:  ENSG00000160200 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35520
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC3.1.0
MODEL REFINEMENTPHENIX
MODEL REFINEMENTISOLDE

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-17
    Type: Initial release