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==Crystal Structure of THE OXYTRICHA NOVA TELOMERE END-BINDING PROTEIN COMPLEXED WITH NONCOGNATE SSDNA GGGGTTTTGTGG==
==Crystal Structure of THE OXYTRICHA NOVA TELOMERE END-BINDING PROTEIN COMPLEXED WITH NONCOGNATE SSDNA GGGGTTTTGTGG==
<StructureSection load='1ph6' size='340' side='right' caption='[[1ph6]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
<StructureSection load='1ph6' size='340' side='right'caption='[[1ph6]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1ph6]] is a 5 chain structure with sequence from [http://en.wikipedia.org/wiki/Sterkiella_nova Sterkiella nova]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PH6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1PH6 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1ph6]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Sterkiella_nova Sterkiella nova]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PH6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PH6 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</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]] 2.1&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1otc|1otc]], [[1jb7|1jb7]], [[1kix|1kix]], [[1k8g|1k8g]], [[1pa6|1pa6]], [[1ph1|1ph1]], [[1ph2|1ph2]], [[1ph3|1ph3]], [[1ph4|1ph4]], [[1ph5|1ph5]], [[1ph7|1ph7]], [[1ph8|1ph8]], [[1ph9|1ph9]], [[1phj|1phj]]</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MAC-56A AND MAC-56K AND MAC-56S ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=200597 Sterkiella nova]), MAC-41A AND MAC-41S ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=200597 Sterkiella nova])</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=1ph6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ph6 OCA], [https://pdbe.org/1ph6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ph6 RCSB], [https://www.ebi.ac.uk/pdbsum/1ph6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ph6 ProSAT]</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=1ph6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ph6 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1ph6 RCSB], [http://www.ebi.ac.uk/pdbsum/1ph6 PDBsum]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/TEBB_OXYNO TEBB_OXYNO]] May function as protective capping of the single-stranded telomeric overhang. May also participate in telomere length regulation during DNA replication. Binds specifically to the T4G4-containing extension on the 3'strand and protects this region of the telomere from nuclease digestion and chemical modification. [[http://www.uniprot.org/uniprot/TEBA_OXYNO TEBA_OXYNO]] May function as protective capping of the single-stranded telomeric overhang. May also participate in telomere length regulation during DNA replication. Binds specifically to the T4G4-containing extension on the 3'strand and protects this region of the telomere from nuclease digestion and chemical modification.  
[https://www.uniprot.org/uniprot/TEBA_STENO TEBA_STENO] May function as protective capping of the single-stranded telomeric overhang. May also participate in telomere length regulation during DNA replication. Binds specifically to the T4G4-containing extension on the 3'strand and protects this region of the telomere from nuclease digestion and chemical modification.
== 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/ph/1ph6_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ph/1ph6_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>
   </jmolCheckbox>
   </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/chain_selection.php?pdb_ID=2ata 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=1ph6 ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Sequence-specific protein recognition of single-stranded nucleic acids is critical for many fundamental cellular processes, such as DNA replication, DNA repair, transcription, translation, recombination, apoptosis and telomere maintenance. To explore the mechanisms of sequence-specific ssDNA recognition, we determined the crystal structures of 10 different non-cognate ssDNAs complexed with the Oxytricha nova telomere end-binding protein (OnTEBP) and evaluated their corresponding binding affinities (PDB ID codes 1PH1-1PH9 and 1PHJ). The thermodynamic and structural effects of these sequence perturbations could not have been predicted based solely upon the cognate structure. OnTEBP accommodates non-cognate nucleotides by both subtle adjustments and surprisingly large structural rearrangements in the ssDNA. In two complexes containing ssDNA intermediates that occur during telomere extension by telomerase, entire nucleotides are expelled from the complex. Concurrently, the sequence register of the ssDNA shifts to re-establish a more cognate-like pattern. This phenomenon, termed nucleotide shuffling, may be of general importance in protein recognition of single-stranded nucleic acids. This set of structural and thermodynamic data highlights a fundamental difference between protein recognition of ssDNA versus dsDNA.
Nucleotide shuffling and ssDNA recognition in Oxytricha nova telomere end-binding protein complexes.,Theobald DL, Schultz SC EMBO J. 2003 Aug 15;22(16):4314-24. PMID:12912928<ref>PMID:12912928</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
==See Also==
</div>
*[[End-binding protein|End-binding protein]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Sterkiella nova]]
[[Category: Sterkiella nova]]
[[Category: Schultz, S C]]
[[Category: Schultz SC]]
[[Category: Theobald, D L]]
[[Category: Theobald DL]]
[[Category: Dna binding protein-dna complex]]
[[Category: Noncognate]]
[[Category: Ob fold]]
[[Category: Oligonucleotide and oligosaccharide binding fold]]
[[Category: Protein dna interaction]]
[[Category: Protein/dna]]
[[Category: Sequence specificity]]
[[Category: Single strand dna binding protein]]
[[Category: Telomere]]

Latest revision as of 11:08, 14 February 2024

Crystal Structure of THE OXYTRICHA NOVA TELOMERE END-BINDING PROTEIN COMPLEXED WITH NONCOGNATE SSDNA GGGGTTTTGTGGCrystal Structure of THE OXYTRICHA NOVA TELOMERE END-BINDING PROTEIN COMPLEXED WITH NONCOGNATE SSDNA GGGGTTTTGTGG

Structural highlights

1ph6 is a 5 chain structure with sequence from Sterkiella nova. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.1Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TEBA_STENO May function as protective capping of the single-stranded telomeric overhang. May also participate in telomere length regulation during DNA replication. Binds specifically to the T4G4-containing extension on the 3'strand and protects this region of the telomere from nuclease digestion and chemical modification.

Evolutionary Conservation

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

See Also

1ph6, resolution 2.10Å

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