1syc: Difference between revisions

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


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==ENGINEERING ALTERNATIVE BETA-TURN TYPES IN STAPHYLOCOCCAL NUCLEASE==
The line below this paragraph, containing "STRUCTURE_1syc", creates the "Structure Box" on the page.
<StructureSection load='1syc' size='340' side='right'caption='[[1syc]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1syc]] 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=1SYC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SYC FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1syc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1syc OCA], [https://pdbe.org/1syc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1syc RCSB], [https://www.ebi.ac.uk/pdbsum/1syc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1syc ProSAT]</span></td></tr>
{{STRUCTURE_1syc| PDB=1syc |  SCENE= }}
</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/sy/1syc_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=1syc ConSurf].
<div style="clear:both"></div>


'''ENGINEERING ALTERNATIVE BETA-TURN TYPES IN STAPHYLOCOCCAL NUCLEASE'''
==See Also==
 
*[[Staphylococcal nuclease 3D structures|Staphylococcal nuclease 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
We have refined the crystal structures of three point mutants of staphylococcal nuclease designed to favor alternative beta-turn types. Single amino acid substitutions were made in a type VIa beta-turn (residues 115-118; Tyr-Lys-Pro-Asn) containing a cis Lys 116-Pro 117 peptide bond. The mutations result in two new backbone conformations, a type I beta-turn for P117T and a type I' beta-turn for P117G and P117A. The P117G and P117A structures exhibit a dramatic difference in backbone conformation in the region of the mutation compared to the nuclease A structure such that the side chain of Lys 116 is reoriented to point into the nucleotide binding pocket. The distinct conformation observed for the nuclease A, P117G, and P117T beta-turn sequences agrees with correlations between beta-turn type and sequence identified from protein crystal structures. The P117A turn conformation provides an exception to these correlations. The results demonstrate that single residue changes can significantly alter backbone conformation, illustrating the process by which diversity in the structure of the protein surface can evolve on a conserved structural core, and suggest protein engineering applications in which the positioning as well as the identify of side chains can be modified to design new enzyme functions. Nuclease variants at the type VIa beta-turn site also allow the relationship between the amino acid sequence and beta-turn conformation to be examined in the context of an identical protein fold in crystallographic detail.
[[Category: Large Structures]]
 
==About this Structure==
1SYC is a [[Single protein]] structure of 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=1SYC OCA].
 
==Reference==
Engineering alternative beta-turn types in staphylococcal nuclease., Hynes TR, Hodel A, Fox RO, Biochemistry. 1994 May 3;33(17):5021-30. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8172877 8172877]
[[Category: Micrococcal nuclease]]
[[Category: Single protein]]
[[Category: Staphylococcus aureus]]
[[Category: Staphylococcus aureus]]
[[Category: Fox, R O.]]
[[Category: Fox RO]]
[[Category: Hodel, A.]]
[[Category: Hodel A]]
[[Category: Hynes, T R.]]
[[Category: Hynes TR]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 09:16:44 2008''

Latest revision as of 11:34, 14 February 2024

ENGINEERING ALTERNATIVE BETA-TURN TYPES IN STAPHYLOCOCCAL NUCLEASEENGINEERING ALTERNATIVE BETA-TURN TYPES IN STAPHYLOCOCCAL NUCLEASE

Structural highlights

1syc 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 1.8Å
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

1syc, resolution 1.80Å

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