1sth: Difference between revisions
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== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1sth]] is a 1 chain structure with sequence from [http://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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1STH FirstGlance]. <br> | <table><tr><td colspan='2'>[[1sth]] is a 1 chain structure with sequence from [http://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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1STH FirstGlance]. <br> | ||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=THP:THYMIDINE-3,5-DIPHOSPHATE'>THP</scene>< | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=THP:THYMIDINE-3,5-DIPHOSPHATE'>THP</scene></td></tr> | ||
<tr><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='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><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1sth FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sth OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1sth RCSB], [http://www.ebi.ac.uk/pdbsum/1sth PDBsum]</span></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=1sth FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sth OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1sth RCSB], [http://www.ebi.ac.uk/pdbsum/1sth PDBsum]</span></td></tr> | ||
<table> | </table> | ||
== 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. | |||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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[[Category: Micrococcal nuclease]] | [[Category: Micrococcal nuclease]] | ||
[[Category: Staphylococcus aureus]] | [[Category: Staphylococcus aureus]] | ||
[[Category: Lattman, E E | [[Category: Lattman, E E]] | ||
[[Category: Loll, P J | [[Category: Loll, P J]] | ||
[[Category: Quirk, S | [[Category: Quirk, S]] | ||
Revision as of 10:55, 24 December 2014
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
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. Publication Abstract from PubMedTwo 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. 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:7703245[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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