View source for 4usg


==Crystal structure of PC4 W89Y mutant complex with DNA==
<StructureSection load='4usg' size='340' side='right'caption='[[4usg]], [[Resolution|resolution]] 1.97&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4usg]] is a 3 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=4USG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4USG 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]] 1.973&#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=4usg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4usg OCA], [https://pdbe.org/4usg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4usg RCSB], [https://www.ebi.ac.uk/pdbsum/4usg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4usg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TCP4_HUMAN TCP4_HUMAN] General coactivator that functions cooperatively with TAFs and mediates functional interactions between upstream activators and the general transcriptional machinery. May be involved in stabilizing the multiprotein transcription complex. Binds single-stranded DNA. Also binds, in vitro, non-specifically to double-stranded DNA (ds DNA).<ref>PMID:8062392</ref> <ref>PMID:8062391</ref> <ref>PMID:7628453</ref> <ref>PMID:9482861</ref> <ref>PMID:16689930</ref> <ref>PMID:9360603</ref> <ref>PMID:16605275</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
PC4, a well-known general transcription cofactor, has multiple functions in transcription and DNA repair. Residue W89, is engaged in stacking interactions with DNA in PC4, but substituted by tyrosine in some PC4 orthologous proteins. In order to understand the consequences and reveal the molecular details of this substitution we have determined the crystal structures of the PC4 orthologue MoSub1 and a PC4 W89Y mutant in complex with DNA. In the structure of MoSub1-DNA complex, Y74 interacts directly with a single nucleotide of oligo DNA. By comparison, the equivalent residue, W89 in wild type PC4 interacts with two nucleotides and the base of the second nucleotide has distinct orientation relative to that of the first one. A hydrophobic patch around W89 that favours interaction with two nucleotides is not formed in the PC4 W89Y mutant. Therefore, the change of the surface hydrophobicity around residue 89 results in a difference between the modes of DNA interaction. These results indicate that the conserved Y74 in MoSub1 or W89 in PC4, are not only key residues in making specific interactions with DNA but also required to determine the DNA binding mode of PC4 proteins.

Substitution of tryptophan 89 with tyrosine switches the DNA binding mode of PC4.,Huang J, Zhao Y, Liu H, Huang D, Cheng X, Zhao W, Taylor IA, Liu J, Peng YL Sci Rep. 2015 Mar 5;5:8789. doi: 10.1038/srep08789. PMID:25739870<ref>PMID:25739870</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4usg" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Liu J]]
[[Category: Zhao Y]]