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[[Image:1ssm.gif|left|200px]]


{{Structure
==Serine Acetyltransferase- Apoenzyme (truncated)==
|PDB= 1ssm |SIZE=350|CAPTION= <scene name='initialview01'>1ssm</scene>, resolution 2.15&Aring;
<StructureSection load='1ssm' size='340' side='right'caption='[[1ssm]], [[Resolution|resolution]] 2.15&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND=  
<table><tr><td colspan='2'>[[1ssm]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Haemophilus_influenzae Haemophilus influenzae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SSM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SSM FirstGlance]. <br>
|ACTIVITY= [http://en.wikipedia.org/wiki/Serine_O-acetyltransferase Serine O-acetyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.30 2.3.1.30]  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.15&#8491;</td></tr>
|GENE= CYSE, HI0606 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=727 Haemophilus influenzae])
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=1ssm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ssm OCA], [https://pdbe.org/1ssm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ssm RCSB], [https://www.ebi.ac.uk/pdbsum/1ssm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ssm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CYSE_HAEIN CYSE_HAEIN]  
== 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/ss/1ssm_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=1ssm ConSurf].
<div style="clear:both"></div>


'''Serine Acetyltransferase- Apoenzyme (truncated)'''
==See Also==
 
*[[Serine acetyltransferase|Serine acetyltransferase]]
 
__TOC__
==Overview==
</StructureSection>
Serine acetyltransferase (SAT, EC 2.3.1.30) catalyzes the CoA-dependent acetylation of the side chain hydroxyl group of l-serine to form O-acetylserine, as the first step of a two-step biosynthetic pathway in bacteria and plants leading to the formation of l-cysteine. This reaction represents a key metabolic point of regulation for the cysteine biosynthetic pathway due to its feedback inhibition by cysteine. We have determined the X-ray crystal structure of Haemophilus influenzae SAT in complexes with CoA and its cysteine feedback inhibitor. The enzyme is a 175 kDa hexamer displaying the characteristic left-handed parallel beta-helix (LbetaH) structural domain of the hexapeptide acyltransferase superfamily of enzymes. Cysteine is bound in a crevice between adjacent LbetaH domains and underneath a loop excluded from the coiled LbetaH. The proximity of its thiol group to the thiol group of CoA derived from superimposed models of the cysteine and CoA complexes confirms that cysteine is bound at the active site. Analysis of the contacts of SAT with cysteine and CoA and the conformational differences that distinguish these complexes provides a structural basis for cysteine feedback inhibition, which invokes competition between cysteine and serine binding and a cysteine-induced conformational change of the C-terminal segment of the enzyme that excludes binding of the cofactor.
 
==About this Structure==
1SSM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Haemophilus_influenzae Haemophilus influenzae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SSM OCA].
 
==Reference==
Structure of serine acetyltransferase in complexes with CoA and its cysteine feedback inhibitor., Olsen LR, Huang B, Vetting MW, Roderick SL, Biochemistry. 2004 May 25;43(20):6013-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15147185 15147185]
[[Category: Haemophilus influenzae]]
[[Category: Haemophilus influenzae]]
[[Category: Serine O-acetyltransferase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Huang B]]
[[Category: Huang, B.]]
[[Category: Olsen LR]]
[[Category: Olsen, L R.]]
[[Category: Roderick SL]]
[[Category: Roderick, S L.]]
[[Category: Vetting MW]]
[[Category: Vetting, M W.]]
[[Category: left-handed parallel beta helix]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 14:09:09 2008''

Latest revision as of 11:35, 1 May 2024

Serine Acetyltransferase- Apoenzyme (truncated)Serine Acetyltransferase- Apoenzyme (truncated)

Structural highlights

1ssm is a 6 chain structure with sequence from Haemophilus influenzae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.15Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CYSE_HAEIN

Evolutionary Conservation

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

See Also

1ssm, resolution 2.15Å

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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA
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