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==IN A STAPHYLOCOCCAL NUCLEASE MUTANT THE SIDE-CHAIN of A LYSINE REPLACING VALINE 66 IS FULLY BURIED IN THE HYDROPHOBIC CORE==
==IN A STAPHYLOCOCCAL NUCLEASE MUTANT THE SIDE-CHAIN of A LYSINE REPLACING VALINE 66 IS FULLY BURIED IN THE HYDROPHOBIC CORE==
<StructureSection load='2snm' size='340' side='right' caption='[[2snm]], [[Resolution|resolution]] 1.97&Aring;' scene=''>
<StructureSection load='2snm' size='340' side='right'caption='[[2snm]], [[Resolution|resolution]] 1.97&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2snm]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"micrococcus_aureus"_(rosenbach_1884)_zopf_1885 "micrococcus aureus" (rosenbach 1884) zopf 1885]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2SNM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2SNM FirstGlance]. <br>
<table><tr><td colspan='2'>[[2snm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2SNM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2SNM FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=THP:THYMIDINE-3,5-DIPHOSPHATE'>THP</scene></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]] 1.97&#8491;</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Micrococcal_nuclease Micrococcal nuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.31.1 3.1.31.1] </span></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=THP:THYMIDINE-3,5-DIPHOSPHATE'>THP</scene></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=2snm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2snm OCA], [http://pdbe.org/2snm PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2snm RCSB], [http://www.ebi.ac.uk/pdbsum/2snm PDBsum]</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=2snm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2snm OCA], [https://pdbe.org/2snm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2snm RCSB], [https://www.ebi.ac.uk/pdbsum/2snm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2snm ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/NUC_STAAU NUC_STAAU]] Enzyme that catalyzes the hydrolysis of both DNA and RNA at the 5' position of the phosphodiester bond.  
[https://www.uniprot.org/uniprot/NUC_STAAU NUC_STAAU] Enzyme that catalyzes the hydrolysis of both DNA and RNA at the 5' position of the phosphodiester bond.
== 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/sn/2snm_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/sn/2snm_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 20:
</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=2snm 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=2snm ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of the staphylococcal nuclease mutant V66K, in which valine 66 is replaced by lysine, has been solved at 1.97 A resolution. Unlike lysine residues in previously reported protein structures, this residue appears to bury its side-chain in the hydrophobic core without salt bridging, hydrogen bonding or other forms of electrostatic stabilization. Solution studies of the free energy of denaturation, delta GH2O, show marked pH dependence and clearly indicate that the lysine residue must be deprotonated in the folded state. V66K is highly unstable at neutral pH but only modestly less stable than the wild-type protein at high pH. The pH dependence of stability for V66K, in combination with similar measurements for the wild-type protein, allowed determination of the pKa values of the lysine in both the denatured and native forms. The epsilon-amine of this residue has a pKa value in the denatured state of 10.2, but in the native state it must be 6.4 or lower. The epsilon-amine is thus deprotonated in the folded molecule. These values enabled an estimation of the epsilon-amine's relative change in free energy of solvation between solvent and the protein interior at 5.1 kcal/mol or greater. This implies that the value of the dielectric constant of the protein interior must be less than 12.8. Lysine is usually found with the methylene groups of its side-chain partly buried but is nevertheless considered a hydrophilic surface residue. It would appear that the high pKa value of lysine, which gives it a positive charge at physiological pH, is the primary reason for its almost exclusive confinement to the surface proteins. When deprotonated, this amino acid type can be fully incorporated into the hydrophobic core.
In a staphylococcal nuclease mutant the side-chain of a lysine replacing valine 66 is fully buried in the hydrophobic core.,Stites WE, Gittis AG, Lattman EE, Shortle D J Mol Biol. 1991 Sep 5;221(1):7-14. PMID:1920420<ref>PMID:1920420</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2snm" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Staphylococcal nuclease|Staphylococcal nuclease]]
*[[Staphylococcal nuclease 3D structures|Staphylococcal nuclease 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Micrococcal nuclease]]
[[Category: Large Structures]]
[[Category: Gittis, A G]]
[[Category: Staphylococcus aureus]]
[[Category: Lattman, E E]]
[[Category: Gittis AG]]
[[Category: Shortle, D]]
[[Category: Lattman EE]]
[[Category: Stites, W E]]
[[Category: Shortle D]]
[[Category: Hydrolase]]
[[Category: Stites WE]]
[[Category: Phosphoric diester]]

Latest revision as of 12:23, 21 February 2024

IN A STAPHYLOCOCCAL NUCLEASE MUTANT THE SIDE-CHAIN of A LYSINE REPLACING VALINE 66 IS FULLY BURIED IN THE HYDROPHOBIC COREIN A STAPHYLOCOCCAL NUCLEASE MUTANT THE SIDE-CHAIN of A LYSINE REPLACING VALINE 66 IS FULLY BURIED IN THE HYDROPHOBIC CORE

Structural highlights

2snm is a 1 chain structure with sequence from Staphylococcus aureus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.97Å
Ligands:,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NUC_STAAU Enzyme that catalyzes the hydrolysis of both DNA and RNA at the 5' position of the phosphodiester bond.

Evolutionary Conservation

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

See Also

2snm, resolution 1.97Å

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