View source for 1ihq


==GLYTM1BZIP: A CHIMERIC PEPTIDE MODEL OF THE N-TERMINUS OF A RAT SHORT ALPHA TROPOMYOSIN WITH THE N-TERMINUS ENCODED BY EXON 1B==
<StructureSection load='1ihq' size='340' side='right'caption='[[1ihq]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ihq]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus] and [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IHQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IHQ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1ihq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ihq OCA], [https://pdbe.org/1ihq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ihq RCSB], [https://www.ebi.ac.uk/pdbsum/1ihq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ihq ProSAT], [https://www.topsan.org/Proteins/NESGC/1ihq TOPSAN]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GCN4_YEAST GCN4_YEAST] Is a transcription factor that is responsible for the activation of more than 30 genes required for amino acid or for purine biosynthesis in response to amino acid or purine starvation. Binds and recognize the DNA sequence: 5'-TGA[CG]TCA-3'.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Tropomyosin is an alpha-helical coiled-coil protein that aligns head-to-tail along the length of the actin filament and regulates its function. The solution structure of the functionally important N terminus of a short 247-residue non-muscle tropomyosin was determined in an engineered chimeric protein, GlyTM1bZip, consisting of the first 19 residues of rat short alpha-tropomyosin and the last 18 residues of the GCN4 leucine zipper. A gene encoding GlyTM1bZip was synthesized, cloned and expressed in Escherichia coli. Triple resonance NMR spectra were analyzed with the program AutoAssign to assign its backbone resonances. Multidimensional nuclear Overhauser effect spectra, X-filtered spectra and (3)J(H(N)-H(alpha)) scalar coupling were analyzed using AutoStructure. This is the first application of this new program to determine the three-dimensional structure of a symmetric homodimer and a structure not previously reported. Residues 7-35 in GlyTM1bZip form a coiled coil, but neither end is helical. Heteronuclear (15)N-(1)H nuclear Overhauser effect data showed that the non-helical N-terminal residues are flexible. The (13)C' chemical shifts of the coiled-coil backbone carbonyl groups in GlyTM1bZip showed a previously unreported periodicity, where resonances arising from residues at the coiled-coil interface in a and d positions of the heptad repeat were displaced relatively upfield and those arising from residues in c positions were displaced relatively downfield. Heteronuclear single quantum coherence spectra, collected as a function of temperature, showed that cross-peaks arising from the alpha-helical backbone and side-chains at the coiled-coil interface broadened or shifted with T(M) values approximately 20 degrees C lower than the loss of alpha-helix measured by circular dichroism, suggesting the presence of a folding intermediate. The side-chain of Ile14, a residue essential for binding interactions, exhibited multiple conformations. The conformational flexibility of the N termini of short tropomyosins may be important for their binding specificity.

Solution NMR structure and folding dynamics of the N terminus of a rat non-muscle alpha-tropomyosin in an engineered chimeric protein.,Greenfield NJ, Huang YJ, Palm T, Swapna GV, Monleon D, Montelione GT, Hitchcock-DeGregori SE J Mol Biol. 2001 Sep 28;312(4):833-47. PMID:11575936<ref>PMID:11575936</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ihq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Greenfield NJ]]
[[Category: Hitchcock-Degregori SE]]
[[Category: Monleon D]]
[[Category: Montelione GT]]
[[Category: Palm T]]
[[Category: Swapna GV]]
[[Category: Yuang YJ]]