4UUU

1.7 A resolution structure of human cystathionine beta-synthase regulatory domain (del 516-525) in complex with SAM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 

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This is version 1.4 of the entry. See complete history


Literature

Inter-Domain Communication of Human Cystathionine Beta Synthase: Structural Basis of S-Adenosyl-L-Methionine Activation.

Mccorvie, T.J.Kopec, J.Hyung, S.Fitzpatrick, F.Feng, X.Termine, D.Strain-Damerell, C.Vollmar, M.Fleming, J.Janz, J.M.Bulawa, C.Yue, W.W.

(2014) J Biol Chem 289: 36018

  • DOI: https://doi.org/10.1074/jbc.M114.610782
  • Primary Citation of Related Structures:  
    4COO, 4UUU

  • PubMed Abstract: 
  • Cystathionine β-synthase (CBS) is a key enzyme in sulfur metabolism, and its inherited deficiency causes homocystinuria. Mammalian CBS is modulated by the binding of S-adenosyl-l-methionine (AdoMet) to its regulatory domain, which activates its catalytic domain ...

    Cystathionine β-synthase (CBS) is a key enzyme in sulfur metabolism, and its inherited deficiency causes homocystinuria. Mammalian CBS is modulated by the binding of S-adenosyl-l-methionine (AdoMet) to its regulatory domain, which activates its catalytic domain. To investigate the underlying mechanism, we performed x-ray crystallography, mutagenesis, and mass spectrometry (MS) on human CBS. The 1.7 Å structure of a AdoMet-bound CBS regulatory domain shows one AdoMet molecule per monomer, at the interface between two constituent modules (CBS-1, CBS-2). AdoMet binding is accompanied by a reorientation between the two modules, relative to the AdoMet-free basal state, to form interactions with AdoMet via residues verified by mutagenesis to be important for AdoMet binding (Phe(443), Asp(444), Gln(445), and Asp(538)) and for AdoMet-driven inter-domain communication (Phe(443), Asp(538)). The observed structural change is further supported by ion mobility MS, showing that as-purified CBS exists in two conformational populations, which converged to one in the presence of AdoMet. We therefore propose that AdoMet-induced conformational change alters the interface and arrangement between the catalytic and regulatory domains within the CBS oligomer, thereby increasing the accessibility of the enzyme active site for catalysis.


    Organizational Affiliation

    From the Structural Genomics Consortium, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, United Kingdom, wyatt.yue@sgc.ox.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYSTATHIONINE BETA-SYNTHASE
A, B
155Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35520
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.85α = 90
b = 78.65β = 90
c = 90.8γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
SHELXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2014-08-20
    Changes: Structure summary
  • Version 1.2: 2014-09-17
    Changes: Structure summary
  • Version 1.3: 2014-11-05
    Changes: Database references
  • Version 1.4: 2015-01-14
    Changes: Database references