6VD1

Crystal structure of Arabidopsis thaliana S-adenosylmethionine Synthase 2 (AtMAT2) in complex with S-adenosylmethionine and PPNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.32 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.142 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report

Currently 6VD1 does not have a validation slider image.


This is version 1.2 of the entry. See complete history


Literature

S-adenosylmethionine synthases in plants: Structural characterization of type I and II isoenzymes from Arabidopsis thaliana and Medicago truncatula.

Sekula, B.Ruszkowski, M.Dauter, Z.

(2020) Int J Biol Macromol 151: 554-565

  • DOI: https://doi.org/10.1016/j.ijbiomac.2020.02.100
  • Primary Citation of Related Structures:  
    6VCW, 6VCX, 6VCY, 6VCZ, 6VD0, 6VD1, 6VD2

  • PubMed Abstract: 

    S-adenosylmethionine synthases (MATs) are responsible for production of S-adenosylmethionine, the cofactor essential for various methylation reactions, production of polyamines and phytohormone ethylene, etc. Plants have two distinct MAT types (I and II). This work presents the structural analysis of MATs from Arabidopsis thaliana (AtMAT1 and AtMAT2, both type I) and Medicago truncatula (MtMAT3a, type II), which, unlike most MATs from other domains of life, are dimers where three-domain subunits are sandwiched flat with one another. Although MAT types are very similar, their subunits are differently oriented within the dimer. Structural snapshots along the enzymatic reaction reveal the exact conformation of precatalytic methionine in the active site and show a binding niche, characteristic only for plant MATs, that may serve as a lock of the gate loop. Nevertheless, plants, in contrary to mammals, lack the MAT regulatory subunit, and the regulation of plant MAT activity is still puzzling. Our structures open a possibility of an allosteric activity regulation of type I plant MATs by linear compounds, like polyamines, which would tighten the relationship between S-adenosylmethionine and polyamine biosynthesis.


  • Organizational Affiliation

    Synchrotron Radiation Research Section, Macromolecular Crystallography Laboratory, National Cancer Institute, Argonne, IL, USA. Electronic address: bartosz.sekula@nih.gov.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
S-adenosylmethionine synthase 2
A, B
402Arabidopsis thalianaMutation(s): 0 
Gene Names: SAM2At4g01850T7B11.11
EC: 2.5.1.6
UniProt
Find proteins for P17562 (Arabidopsis thaliana)
Explore P17562 
Go to UniProtKB:  P17562
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17562
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 11 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SAM (Subject of Investigation/LOI)
Query on SAM

Download Ideal Coordinates CCD File 
K [auth A],
U [auth B]
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
PE8
Query on PE8

Download Ideal Coordinates CCD File 
Q [auth B]3,6,9,12,15,18,21-HEPTAOXATRICOSANE-1,23-DIOL
C16 H34 O9
GLZWNFNQMJAZGY-UHFFFAOYSA-N
PPK (Subject of Investigation/LOI)
Query on PPK

Download Ideal Coordinates CCD File 
C [auth A],
M [auth B]
(DIPHOSPHONO)AMINOPHOSPHONIC ACID
H6 N O9 P3
PELPUMGXMYVGSQ-UHFFFAOYSA-N
1PE
Query on 1PE

Download Ideal Coordinates CCD File 
I [auth A]PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
MPO
Query on MPO

Download Ideal Coordinates CCD File 
H [auth A],
S [auth B]
3[N-MORPHOLINO]PROPANE SULFONIC ACID
C7 H15 N O4 S
DVLFYONBTKHTER-UHFFFAOYSA-N
PGE
Query on PGE

Download Ideal Coordinates CCD File 
J [auth A],
T [auth B]
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
PGR
Query on PGR

Download Ideal Coordinates CCD File 
O [auth B]R-1,2-PROPANEDIOL
C3 H8 O2
DNIAPMSPPWPWGF-GSVOUGTGSA-N
PDO
Query on PDO

Download Ideal Coordinates CCD File 
N [auth B]1,3-PROPANDIOL
C3 H8 O2
YPFDHNVEDLHUCE-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
L [auth A],
V [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
K (Subject of Investigation/LOI)
Query on K

Download Ideal Coordinates CCD File 
G [auth A],
R [auth B]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
F [auth A],
P [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.32 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.142 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.205α = 90
b = 101.484β = 99.37
c = 84.334γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
PHASERphasing
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Currently 6VD1 does not have a validation slider image.



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesThe Intramural Research Program

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-26
    Type: Initial release
  • Version 1.1: 2020-03-11
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Derived calculations, Refinement description