1trr

<StructureSection load='1trr' size='340' side='right' caption='[[1trr]], [[Resolution|resolution]] 2.40&Aring;' scene=''>

<table><tr><td colspan='2'>[[1trr]] is a 12 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TRR OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1TRR FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=TRP:TRYPTOPHAN'>TRP</scene></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=1trr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1trr OCA], [http://pdbe.org/1trr PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1trr RCSB], [http://www.ebi.ac.uk/pdbsum/1trr PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1trr ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/TRPR_ECOLI TRPR_ECOLI]] This protein is an aporepressor. When complexed with L-tryptophan it binds the operator region of the trp operon (5'-ACTAGT-'3') and prevents the initiation of transcription. The complex also regulates trp repressor biosynthesis by binding to its regulatory region.

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== Publication Abstract from PubMed ==

The crystal structure of trp repressor tandemly bound in a 2:1 complex to a 16-base-pair palindromic DNA containing a central trp operator half-site has been determined and refined to 2.4 A resolution. Despite dramatically different DNA sequence contexts and crystallization conditions, the protein/DNA interface is essentially identical to that seen in the original trp repressor/operator complex structure. Water-mediated sequence recognition by trp repressor is likely to be related to the unusual end-on approach of the recognition helix (E), which allows sharing of the major groove by tandem dimers. The tandem complex model accounts for the mutational sensitivity of all trp operator base pairs. The structure also provides the first detailed view of the tandem interaction, revealing a key role for the amino-terminal arms.

Tandem binding in crystals of a trp repressor/operator half-site complex.,Lawson CL, Carey J Nature. 1993 Nov 11;366(6451):178-82. PMID:8232559<ref>PMID:8232559</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Carey, J]]

[[Category: Lawson, C L]]

[[Category: Protein-dna complex]]

[[Category: Transcription-dna complex]]