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[[Image:1es4.gif|left|200px]]<br /><applet load="1es4" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1es4, resolution 1.90&Aring;" />
'''C98N mutant of streptomyces K15 DD-transpeptidase'''<br />


==Overview==
==C98N mutant of streptomyces K15 DD-transpeptidase==
The Streptomyces K15 penicillin-binding DD-transpeptidase is presumed to be involved in peptide cross-linking during bacterial cell wall peptidoglycan assembly. To gain insight into the catalytic mechanism, the roles of residues Lys38, Ser96, and Cys98, belonging to the structural elements defining the active site cleft, have been investigated by site-directed mutagenesis, biochemical studies, and X-ray diffraction analysis. The Lys38His and Ser96Ala mutations almost completely abolished the penicillin binding and severely impaired the transpeptidase activities while the geometry of the active site was essentially the same as in the wild-type enzyme. It is proposed that Lys38 acts as the catalytic base that abstracts a proton from the active serine Ser35 during nucleophilic attack and that Ser96 is a key intermediate in the proton transfer from the Ogamma of Ser35 to the substrate leaving group nitrogen. The role of these two residues should be conserved among penicillin-binding proteins containing the Ser-Xaa-Asn/Cys sequence in motif 2. Conversion of Cys98 into Asn decreased the transpeptidase activity and increased hydrolysis of the thiolester substrate and the acylation rate with most beta-lactam antibiotics. Cys98 is proposed to play the same role as Asn in motif 2 of other penicilloyl serine transferases in properly positioning the substrate for the catalytic process.
<StructureSection load='1es4' size='340' side='right'caption='[[1es4]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1es4]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_sp._K15 Streptomyces sp. K15]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ES4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ES4 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</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=1es4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1es4 OCA], [https://pdbe.org/1es4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1es4 RCSB], [https://www.ebi.ac.uk/pdbsum/1es4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1es4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DACX_STRSK DACX_STRSK] Removes C-terminal D-alanyl residues from sugar-peptide cell wall precursors.
== 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/es/1es4_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=1es4 ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1ES4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptomyces_sp. Streptomyces sp.]. Active as [http://en.wikipedia.org/wiki/Serine-type_D-Ala-D-Ala_carboxypeptidase Serine-type D-Ala-D-Ala carboxypeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.16.4 3.4.16.4] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ES4 OCA].
*[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]]
 
*[[Penicillin-binding protein 3D structures|Penicillin-binding protein 3D structures]]
==Reference==
__TOC__
Catalytic mechanism of the Streptomyces K15 DD-transpeptidase/penicillin-binding protein probed by site-directed mutagenesis and structural analysis., Rhazi N, Charlier P, Dehareng D, Engher D, Vermeire M, Frere JM, Nguyen-Disteche M, Fonze E, Biochemistry. 2003 Mar 18;42(10):2895-906. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12627955 12627955]
</StructureSection>
[[Category: Serine-type D-Ala-D-Ala carboxypeptidase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Streptomyces sp. K15]]
[[Category: Streptomyces sp.]]
[[Category: Charlier P]]
[[Category: Charlier, P.]]
[[Category: Fonze E]]
[[Category: Fonze, E.]]
[[Category: beta-lactamase]]
[[Category: dd-transpeptidase]]
[[Category: hydrolase carboxypeptidase]]
[[Category: penicillin-binding]]
[[Category: serine peptidase]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:30:53 2008''

Latest revision as of 10:06, 7 February 2024

C98N mutant of streptomyces K15 DD-transpeptidaseC98N mutant of streptomyces K15 DD-transpeptidase

Structural highlights

1es4 is a 1 chain structure with sequence from Streptomyces sp. K15. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.9Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

DACX_STRSK Removes C-terminal D-alanyl residues from sugar-peptide cell wall precursors.

Evolutionary Conservation

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

See Also

1es4, resolution 1.90Å

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