1nla: Difference between revisions
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<StructureSection load='1nla' size='340' side='right' caption='[[1nla]], [[NMR_Ensembles_of_Models | 13 NMR models]]' scene=''> | <StructureSection load='1nla' size='340' side='right' caption='[[1nla]], [[NMR_Ensembles_of_Models | 13 NMR models]]' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1nla]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[1nla]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bpp22 Bpp22]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NLA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1NLA FirstGlance]. <br> | ||
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1qtg|1qtg]]</td></tr> | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1qtg|1qtg]]</td></tr> | ||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ARC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10754 | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ARC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10754 BPP22])</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=1nla FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nla OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1nla RCSB], [http://www.ebi.ac.uk/pdbsum/1nla PDBsum]</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=1nla FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nla OCA], [http://pdbe.org/1nla PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1nla RCSB], [http://www.ebi.ac.uk/pdbsum/1nla PDBsum]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 1nla" style="background-color:#fffaf0;"></div> | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Bpp22]] | ||
[[Category: Cordes, M H]] | [[Category: Cordes, M H]] | ||
[[Category: McKnight, C J]] | [[Category: McKnight, C J]] | ||
Revision as of 13:09, 10 September 2015
Solution Structure of Switch Arc, a Mutant with 3(10) Helices Replacing a Wild-Type Beta-RibbonSolution Structure of Switch Arc, a Mutant with 3(10) Helices Replacing a Wild-Type Beta-Ribbon
Structural highlights
Function[RARC_BPP22] This protein acts as a transcriptional repressor of its own gene arc and of gene ant. Publication Abstract from PubMedAdjacent N11L and L12N mutations in the antiparallel beta-ribbon of Arc repressor result in dramatic changes in local structure in which each beta-strand is replaced by a right-handed helix. The full solution structure of this "switch" Arc mutant shows that irregular 3(10) helices compose the new secondary structure. This structural metamorphosis conserves the number of main-chain and side-chain to main-chain hydrogen bonds and the number of fully buried core residues. Apart from a slight widening of the interhelical angle between alpha-helices A and B and changes in side-chain conformation of a few core residues in Arc, no large-scale structural adjustments in the remainder of the protein are necessary to accommodate the ribbon-to-helix change. Nevertheless, some changes in hydrogen-exchange rates are observed, even in regions that have very similar structures in the two proteins. The surface of switch Arc is packed poorly compared to wild-type, leading to approximately 1000A(2) of additional solvent-accessible surface area, and the N termini of the 3(10) helices make unfavorable head-to-head electrostatic interactions. These structural features account for the positive m value and salt dependence of the ribbon-to-helix transition in Arc-N11L, a variant that can adopt either the mutant or wild-type structures. The tertiary fold is capped in different ways in switch and wild-type Arc, showing how stepwise evolutionary transformations can arise through small changes in amino acid sequence. Solution structure of switch Arc, a mutant with 3(10) helices replacing a wild-type beta-ribbon.,Cordes MH, Walsh NP, McKnight CJ, Sauer RT J Mol Biol. 2003 Feb 21;326(3):899-909. PMID:12581649[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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