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==S-ADENOSYLMETHIONINE SYNTHETASE==
==S-ADENOSYLMETHIONINE SYNTHETASE==
<StructureSection load='1fug' size='340' side='right' caption='[[1fug]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
<StructureSection load='1fug' size='340' side='right'caption='[[1fug]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1fug]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FUG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1FUG FirstGlance]. <br>
<table><tr><td colspan='2'>[[1fug]] is a 2 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=1FUG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1FUG FirstGlance]. <br>
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[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] </span></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.2&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1fug FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fug OCA], [http://pdbe.org/1fug PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1fug RCSB], [http://www.ebi.ac.uk/pdbsum/1fug PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1fug ProSAT]</span></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=1fug FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fug OCA], [https://pdbe.org/1fug PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1fug RCSB], [https://www.ebi.ac.uk/pdbsum/1fug PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1fug ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://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]  
[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 ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
Check<jmol>
   <jmolCheckbox>
   <jmolCheckbox>
     <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fu/1fug_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fu/1fug_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
     <text>to colour the structure by Evolutionary Conservation</text>
Line 19: Line 19:
</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=1fug ConSurf].
</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=1fug ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
S-Adenosylmethionine synthetase (MAT, ATP:L-methionine S-adenosyltransferase, E.C.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. MAT from Escherichia coli was crystallized in the tetragonal modification with space group P4(3)2(1)2 using the same conditions as previously yielded crystals of the hexagonal system [Takusagawa, et al., (1996), J. Biol. Chem. 171, 136-147], except for the crystallization temperature. The structure has been determined by molecular replacement at 3.2 A resolution. The overall structure of the tetrameric MAT in the tetragonal modification is essentially the same as the structure found in the hexagonal modification. However there are two remarkable differences between the structures of two modifications. One is the contents in the active sites (holoform vs. apo-form), and the other is the conformation of the flexible loop over the active site (open vs. closed). These differences in the crystal structures are caused solely by the difference in crystallization temperatures (26 degrees C vs. 4 degrees C). We have interpreted the structural data obtained from the X-ray analyses in conjunction with the results of the mechanistic and sequencing studies in terms of possible dynamic motion of the flexible loop. When a substrate/product binds in the active site (hexagonal modification), the loop becomes disordered, apparently due to flexibility at the entrance of the active site as if it acts as a "mobile loop" during the catalytic reaction. On the other hand, when the temperature is decreased, the dynamic motion of the flexible loop may be reduced, and the loop residues enter the active site and close its entrance (tetragonal modification). Thus, the active site of the tetragonal modification is empty despite the crystals being grown in mother liquor containing a large concentration of phosphate (100 mM). There is no significant displacement of amino acid residues in the active site between the holo and apo forms, suggesting that the flexible loop plays an important role in determination of the contents in the active site. Since the functionally important amino acid residues in the active site are all conserved throughout various species, the structures of the active sites and the mechanism of the catalysis are probably essentially identical in the enzymes from a wide range of organisms. However, the substrate KM and Vmax values of MATs from various species are distributed over a wide range. The amino acid residues in the flexible loop regions are poorly conserved throughout various species. Therefore, the wide differences in catalysis rates of MATs from various speeches may be due to the differences in the composition of the flexible loop.
Flexible loop in the structure of S-adenosylmethionine synthetase crystallized in the tetragonal modification.,Fu Z, Hu Y, Markham GD, Takusagawa F J Biomol Struct Dyn. 1996 Apr;13(5):727-39. PMID:8723769<ref>PMID:8723769</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1fug" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[SAM synthetase|SAM synthetase]]
*[[S-adenosylmethionine synthetase 3D structures|S-adenosylmethionine synthetase 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Methionine adenosyltransferase]]
[[Category: Escherichia coli]]
[[Category: Fu, Z]]
[[Category: Large Structures]]
[[Category: Markham, G D]]
[[Category: Fu Z]]
[[Category: Takusagawa, F]]
[[Category: Markham GD]]
[[Category: Atp-binding]]
[[Category: Takusagawa F]]
[[Category: Multigene family]]
[[Category: One-carbon metabolism]]
[[Category: Transferase]]

Latest revision as of 10:19, 7 February 2024

S-ADENOSYLMETHIONINE SYNTHETASES-ADENOSYLMETHIONINE SYNTHETASE

Structural highlights

1fug is a 2 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 3.2Å
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

1fug, resolution 3.20Å

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