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[[Image:1mxb.jpg|left|200px]]


{{Structure
==S-ADENOSYLMETHIONINE SYNTHETASE WITH ADP==
|PDB= 1mxb |SIZE=350|CAPTION= <scene name='initialview01'>1mxb</scene>, resolution 2.8&Aring;
<StructureSection load='1mxb' size='340' side='right'caption='[[1mxb]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene> and <scene name='pdbligand=ADP:ADENOSINE-5'-DIPHOSPHATE'>ADP</scene>
<table><tr><td colspan='2'>[[1mxb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MXB FirstGlance]. <br>
|ACTIVITY= [http://en.wikipedia.org/wiki/Methionine_adenosyltransferase Methionine adenosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.6 2.5.1.6]  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
}}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1mxb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxb OCA], [https://pdbe.org/1mxb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mxb RCSB], [https://www.ebi.ac.uk/pdbsum/1mxb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mxb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/METK_ECOLI METK_ECOLI] Catalyzes the formation of S-adenosylmethionine from methionine and ATP. The overall synthetic reaction is composed of two sequential steps, AdoMet formation and the subsequent tripolyphosphate hydrolysis which occurs prior to release of AdoMet from the enzyme. Is essential for growth.[HAMAP-Rule:MF_00086]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mx/1mxb_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1mxb ConSurf].
<div style="clear:both"></div>


'''S-ADENOSYLMETHIONINE SYNTHETASE WITH ADP'''
==See Also==
 
*[[S-adenosylmethionine synthetase 3D structures|S-adenosylmethionine synthetase 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
S-Adenosylmethionine synthetase (MAT,ATP:L-methionine S-adenosltransferase, EC 2.5.1.6) plays a central metabolic role in all organisms. MAT catalyzes the two-step reaction which synthesizes S-adenosylmethionine (AdoMet), pyrophosphate (PPi), and orthophosphate (Pi) from ATP and L-methionine. AdoMet is the primary methyl group donor in biological systems. The first crystal structure of MAT from Escherichia coli has recently been determined [Takusagawa et al. (1995) J. Biol. Chem. 271, 136-147]. In order to elucidate the active site and possible catalytic reaction mechanism, the MAT structures in the crystals grown with the substrate ATP (and BrATP) and the product PPi have been determined (space group P6(2)22; unit cell a = b = 128.9 Angstroms, c= 139.8 Angstroms, resolution limit 2.8 Angstroms; R O.19; Rfree 0.26). The enzyme consists of four identical subunits; two subunits form a spherical dimer, and pairs of these tightly bound dimers form a tetrameric enzyme. Each dimer has two active sites which are located between the subunits. Each subunit consists of three domains related to each other by a pseudo 3-fold symmetry. The crystal structures showed that the ATP molecules were hydrolyzed to ADP and Pi by the enzyme. Those products were found at the active site along with the essential metal ions (K+ and Mg2+). This rather unexpected finding was first confirmed by the structure of the complex with PPi and later by an HPLC analysis. The enzyme hydrolyzed ATP to ADP and Pi in 72 h under the same conditions as the crystallization of the enzyme. In the active site, the diphosphate moiety of ADP and Pi interacts extensively with amino acid residues from the two subunits of the enzyme, whereas the adenine and ribose moieties have little interaction with the enzyme. The enzyme structure is little changed upon binding ADP. All amino acid residues involved in the active site are found to be conserved in the 14 reported sequences of MAT from a wide range of organisms. Thus the structure determined in this study can be utilized as a model for other members of the MAT family. On the basis of the crystal structures, the catalytic reaction mechanisms of AdoMet formation and hydrolysis of tripolyphosphate are proposed.
 
==About this Structure==
1MXB is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXB OCA].
 
==Reference==
Structure and function of S-adenosylmethionine synthetase: crystal structures of S-adenosylmethionine synthetase with ADP, BrADP, and PPi at 28 angstroms resolution., Takusagawa F, Kamitori S, Markham GD, Biochemistry. 1996 Feb 27;35(8):2586-96. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8611562 8611562]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Methionine adenosyltransferase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Kamitori S]]
[[Category: Kamitori, S.]]
[[Category: Markham GD]]
[[Category: Markham, G D.]]
[[Category: Takusagawa F]]
[[Category: Takusagawa, F.]]
[[Category: ADP]]
[[Category: K]]
[[Category: MG]]
[[Category: PO4]]
[[Category: atp-binding]]
[[Category: one-carbon metabolism]]
[[Category: transferase]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 12:49:24 2008''

Latest revision as of 10:49, 14 February 2024

S-ADENOSYLMETHIONINE SYNTHETASE WITH ADPS-ADENOSYLMETHIONINE SYNTHETASE WITH ADP

Structural highlights

1mxb is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.8Å
Ligands:, , ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

METK_ECOLI Catalyzes the formation of S-adenosylmethionine from methionine and ATP. The overall synthetic reaction is composed of two sequential steps, AdoMet formation and the subsequent tripolyphosphate hydrolysis which occurs prior to release of AdoMet from the enzyme. Is essential for growth.[HAMAP-Rule:MF_00086]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1mxb, resolution 2.80Å

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