View source for 5fj4


==Structure of the standard kink turn HmKt-7 as stem loop bound with U1A and L7Ae proteins==
<StructureSection load='5fj4' size='340' side='right'caption='[[5fj4]], [[Resolution|resolution]] 2.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5fj4]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Arcfu Arcfu] and [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5FJ4 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5FJ4 FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5fj0|5fj0]], [[5fj1|5fj1]], [[5fjc|5fjc]]</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5fj4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5fj4 OCA], [http://pdbe.org/5fj4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5fj4 RCSB], [http://www.ebi.ac.uk/pdbsum/5fj4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5fj4 ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/SNRPA_HUMAN SNRPA_HUMAN]] Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro.<ref>PMID:9848648</ref>  [[http://www.uniprot.org/uniprot/RL7A_ARCFU RL7A_ARCFU]] Multifunctional RNA-binding protein that recognizes the K-turn motif in ribosomal RNA, box H/ACA and box C/D sRNAs.<ref>PMID:12560482</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
k-turns are commonly-occurring motifs that introduce sharp kinks into duplex RNA, thereby facilitating tertiary contacts. Both the folding and conformation of k-turns are determined by their local sequence. k-turns fall into two conformational classes, called N3 and N1, that differ in the pattern of hydrogen bonding in the core. We show here that this is determined by the basepair adjacent to the critical G*A pairs. We determined crystal structures of a series of Kt-7 variants in which this 3b,3n position has been systematically varied, showing that this leads to a switch in the conformation. We have previously shown that the 3b,3n position also determines the folding characteristics of the k-turn, i.e. whether or not the k-turn can fold in the presence of metal ions alone. We have analyzed the distribution of 3b,3n sequences from four classes of k-turns from ribosomes, riboswitches and U4 snRNA, finding a strong conservation of properties for a given k-turn type. We thus demonstrate a strong association between biological function, 3b,3n sequence and k-turn folding and conformation. This has strong predictive power, and can be applied to the modeling of large RNA architectures.

A critical base pair in k-turns determines the conformational class adopted, and correlates with biological function.,Huang L, Wang J, Lilley DM Nucleic Acids Res. 2016 Mar 25. pii: gkw201. PMID:27016741<ref>PMID:27016741</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5fj4" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Arcfu]]
[[Category: Human]]
[[Category: Large Structures]]
[[Category: Huang, L]]
[[Category: Lilley, D M.J]]
[[Category: Kink turn]]
[[Category: Transcription]]