2AZT

Crystal structure of H176N mutant of human Glycine N-Methyltransferase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Destabilization of human glycine N-methyltransferase by H176N mutation.

Luka, Z., Pakhomova, S., Luka, Y., Newcomer, M.E., Wagner, C.

(2007) Protein Sci 16: 1957-1964

  • DOI: 10.1110/ps.072921507
  • Primary Citation of Related Structures:  
    2AZT

  • PubMed Abstract: 

    • In the presence of moderate (2-4 M) urea concentrations the tetrameric enzyme, glycine N-methyltransferase (GNMT), dissociates into compact monomers. Higher concentrations of urea (7-8 M) promote complete denaturation of the enzyme. We report here that the H176N mutation in this enzyme, found in humans with hypermethioninaemia, significantly decreases stability of the tetramer, although H176 is located far from the intersubunit contact areas ...

    In the presence of moderate (2-4 M) urea concentrations the tetrameric enzyme, glycine N-methyltransferase (GNMT), dissociates into compact monomers. Higher concentrations of urea (7-8 M) promote complete denaturation of the enzyme. We report here that the H176N mutation in this enzyme, found in humans with hypermethioninaemia, significantly decreases stability of the tetramer, although H176 is located far from the intersubunit contact areas. Dissociation of the tetramer to compact monomers and unfolding of compact monomers of the mutant protein were detected by circular dichroism, quenching of fluorescence emission, size-exclusion chromatography, and enzyme activity. The values of apparent free energy of dissociation of tetramer and of unfolding of compact monomers for the H176N mutant (27.7 and 4.2 kcal/mol, respectively) are lower than those of wild-type protein (37.5 and 6.2 kcal/mol). A 2.7 A resolution structure of the mutant protein revealed no significant difference in the conformation of the protein near the mutated residue.

    Organizational Affiliation: 

    Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glycine N-methyltransferaseA, B295Homo sapiensMutation(s): 1 
Gene Names: GNMT
EC: 2.1.1.20
UniProt & NIH Common Fund Data Resources
Find proteins for Q14749 (Homo sapiens)
Explore Q14749 
Go to UniProtKB:  Q14749
PHAROS:  Q14749
GTEx:  ENSG00000124713
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.239 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.116α = 90
b = 83.279β = 90
c = 115.45γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-26
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations