1sth: Difference between revisions

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[[Image:1sth.jpg|left|200px]]<br /><applet load="1sth" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1sth, resolution 1.85&Aring;" />
'''TWO DISTINCTLY DIFFERENT METAL BINDING MODES ARE SEEN IN X-RAY CRYSTAL STRUCTURES OF STAPHYLOCOCCAL NUCLEASE-COBALT(II)-NUCLEOTIDE COMPLEXES'''<br />


==Overview==
==TWO DISTINCTLY DIFFERENT METAL BINDING MODES ARE SEEN IN X-RAY CRYSTAL STRUCTURES OF STAPHYLOCOCCAL NUCLEASE-COBALT(II)-NUCLEOTIDE COMPLEXES==
Two crystal structures of ternary complexes of staphylococcal nuclease, cobalt(II), and the mononucleotide pdTp are reported. The first has been refined at 1.7 A to a crystallographic R value of 0.198; the second, determined from a crystal soaked for 9 months in a slightly different mother liquor than the first crystal, has been refined at 1.85 A to an R value of 0.174. In the first structure, the cobalt ion is displaced 1.94 A from the normal calcium position, and the active site is dominated by a salt bridge between Asp-21 and Lys-70 from a symmetry-related molecule in the crystal lattice. The Co2+ ion appears unable to displace this lysine; consequently, the metal is bound in a vestibular site adjacent to the calcium site. The metal-binding pocket in the second structure adopts a configuration similar to that of the calcium complex, with the cobalt ion binding only 0.36 A from the calcium position. However, an inner sphere water seen in the calcium structure is missing from this structure. The cobalt ion in the second structure appears to be loosely or transiently coordinated within the calcium binding pocket, as evidenced by the high value of its refined thermal factor. Loss of catalytic activity for cobalt(II)-substituted nuclease is perhaps due to its inability to bind this inner sphere water.
<StructureSection load='1sth' size='340' side='right'caption='[[1sth]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1sth]] 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=1STH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1STH 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]] 1.85&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</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'>[https://proteopedia.org/fgij/fg.htm?mol=1sth FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sth OCA], [https://pdbe.org/1sth PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1sth RCSB], [https://www.ebi.ac.uk/pdbsum/1sth PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1sth ProSAT]</span></td></tr>
</table>
== Function ==
[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 ==
[[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/st/1sth_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=1sth ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1STH is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus] with <scene name='pdbligand=CO:'>CO</scene> and <scene name='pdbligand=THP:'>THP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1STH OCA].
*[[Staphylococcal nuclease 3D structures|Staphylococcal nuclease 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
X-ray crystal structures of staphylococcal nuclease complexed with the competitive inhibitor cobalt(II) and nucleotide., Loll PJ, Quirk S, Lattman EE, Garavito RM, Biochemistry. 1995 Apr 4;34(13):4316-24. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=7703245 7703245]
[[Category: Large Structures]]
[[Category: Micrococcal nuclease]]
[[Category: Single protein]]
[[Category: Staphylococcus aureus]]
[[Category: Staphylococcus aureus]]
[[Category: Lattman, E E.]]
[[Category: Lattman EE]]
[[Category: Loll, P J.]]
[[Category: Loll PJ]]
[[Category: Quirk, S.]]
[[Category: Quirk S]]
[[Category: CO]]
[[Category: THP]]
[[Category: hydrolase (phosphoric diester)]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:05:04 2008''

Latest revision as of 11:33, 14 February 2024

TWO DISTINCTLY DIFFERENT METAL BINDING MODES ARE SEEN IN X-RAY CRYSTAL STRUCTURES OF STAPHYLOCOCCAL NUCLEASE-COBALT(II)-NUCLEOTIDE COMPLEXESTWO DISTINCTLY DIFFERENT METAL BINDING MODES ARE SEEN IN X-RAY CRYSTAL STRUCTURES OF STAPHYLOCOCCAL NUCLEASE-COBALT(II)-NUCLEOTIDE COMPLEXES

Structural highlights

1sth 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 1.85Å
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

1sth, resolution 1.85Å

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