View source for 3vke


==Contribution of the first K-homology domain of poly(C)-binding protein 1 to its affinity and specificity for C-rich oligonucleotides==
<StructureSection load='3vke' size='340' side='right'caption='[[3vke]], [[Resolution|resolution]] 1.77&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3vke]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VKE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3VKE 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]] 1.77&#8491;</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=3vke FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3vke OCA], [https://pdbe.org/3vke PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3vke RCSB], [https://www.ebi.ac.uk/pdbsum/3vke PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3vke ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PCBP1_HUMAN PCBP1_HUMAN] Single-stranded nucleic acid binding protein that binds preferentially to oligo dC.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Poly-C-binding proteins are triple KH (hnRNP K homology) domain proteins with specificity for single stranded C-rich RNA and DNA. They play diverse roles in the regulation of protein expression at both transcriptional and translational levels. Here, we analyse the contributions of individual alphaCP1 KH domains to binding C-rich oligonucleotides using biophysical and structural methods. Using surface plasmon resonance (SPR), we demonstrate that KH1 makes the most stable interactions with both RNA and DNA, KH3 binds with intermediate affinity and KH2 only interacts detectibly with DNA. The crystal structure of KH1 bound to a 5'-CCCTCCCT-3' DNA sequence shows a 2:1 protein:DNA stoichiometry and demonstrates a molecular arrangement of KH domains bound to immediately adjacent oligonucleotide target sites. SPR experiments, with a series of poly-C-sequences reveals that cytosine is preferred at all four positions in the oligonucleotide binding cleft and that a C-tetrad binds KH1 with 10 times higher affinity than a C-triplet. The basis for this high affinity interaction is finally detailed with the structure determination of a KH1.W.C54S mutant bound to 5'-ACCCCA-3' DNA sequence. Together, these data establish the lead role of KH1 in oligonucleotide binding by alphaCP1 and reveal the molecular basis of its specificity for a C-rich tetrad.

Contribution of the first K-homology domain of poly(C)-binding protein 1 to its affinity and specificity for C-rich oligonucleotides.,Yoga YM, Traore DA, Sidiqi M, Szeto C, Pendini NR, Barker A, Leedman PJ, Wilce JA, Wilce MC Nucleic Acids Res. 2012 Feb 16. PMID:22344691<ref>PMID:22344691</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3vke" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Traore DAK]]
[[Category: Wilce JA]]
[[Category: Wilce MCJ]]