Inter-dimeric interface controls function and stability of S-methionine adenosyltransferase from U. urealiticum

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.212 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


The interdimeric interface controls function and stability of Ureaplasma urealiticum methionine S-adenosyltransferase.

Kleiner, D.Shmulevich, F.Zarivach, R.Shahar, A.Sharon, M.Ben-Nissan, G.Bershtein, S.

(2019) J Mol Biol 431: 4796-4816

  • DOI: https://doi.org/10.1016/j.jmb.2019.09.003
  • Primary Citation of Related Structures:  
    6RJS, 6RK5, 6RK7, 6RKA, 6RKC

  • PubMed Abstract: 

    Methionine S-adenosyltransferases (MATs) are predominantly homotetramers, comprised of dimers of dimers. The larger, highly conserved intradimeric interface harbors two active sites, making the dimer the obligatory functional unit. However, functionality of the smaller, more diverged, and recently evolved interdimeric interface is largely unknown. Here, we show that the interdimeric interface of Ureaplasmaurealiticum MAT has evolved to control the catalytic activity and structural integrity of the homotetramer in response to product accumulation. When all four active sites are occupied with the product, S-adenosylmethionine (SAM), binding of four additional SAM molecules to the interdimeric interface prompts a ∼45° shift in the dimer orientation and a concomitant ∼60% increase in the interface area. This rearrangement inhibits the enzymatic activity by locking the flexible active site loops in a closed state and renders the tetramer resistant to proteolytic degradation. Our findings suggest that the interdimeric interface of MATs is subject to rapid evolutionary changes that tailor the molecular properties of the entire homotetramer to the specific needs of the organism.

  • Organizational Affiliation

    Department of Life Sciences, Ben-Gurion University of the Negev, POB 653, Beer-Sheva, 84105, Israel; Macromolecular Crystallography Research Center (MCRC), The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Methionine adenosyltransferaseA,
B [auth C],
C [auth B],
377Ureaplasma urealyticum serovar 7 str. ATCC 27819Mutation(s): 0 
Gene Names: metKUUR7_0462
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.212 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.205α = 77.93
b = 64.064β = 83.86
c = 114.495γ = 73.97
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Israel Science FoundationIsrael1630/15

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-25
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Database references