6st6

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<StructureSection load='6st6' size='340' side='right'caption='[[6st6]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
<StructureSection load='6st6' size='340' side='right'caption='[[6st6]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[6st6]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ST6 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6ST6 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[6st6]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ST6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ST6 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.05&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1mi7|1mi7]], [[1jhg|1jhg]]</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">trpR, rtrY, b4393, JW4356 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6st6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6st6 OCA], [https://pdbe.org/6st6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6st6 RCSB], [https://www.ebi.ac.uk/pdbsum/6st6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6st6 ProSAT]</span></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6st6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6st6 OCA], [http://pdbe.org/6st6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6st6 RCSB], [http://www.ebi.ac.uk/pdbsum/6st6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6st6 ProSAT]</span></td></tr>
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</table>
</table>
== Function ==
== Function ==
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[[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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[https://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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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The crystal structures of domain-swapped tryptophan repressor (TrpR) variant Val58Ile before and after soaking with the physiological ligand L-tryptophan (L-Trp) indicate that L-Trp occupies the same location in the domain-swapped form as in native dimeric TrpR and makes equivalent residue contacts. This result is unexpected because the ligand binding-site residues arise from three separate polypeptide chains in the domain-swapped form. This work represents the first published structure of a domain-swapped form of TrpR with L-Trp bound. The presented structures also show that the protein amino-terminus, whether or not it bears a disordered extension of about 20 residues, is accessible in the large solvent channels of the domain-swapped crystal form, as in the structures reported previously in this form for TrpR without N-terminal extensions. These findings inspire the exploration of L-Trp analogs and N-terminal modifications as labels to orient guest proteins that cannot otherwise be crystallized in the solvent channels of crystalline domain-swapped TrpR hosts for potential diffraction analysis.
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Crystal structures of Val58Ile tryptophan repressor in a domain-swapped array in the presence and absence of L-tryptophan.,Sprenger J, Lawson CL, von Wachenfeldt C, Lo Leggio L, Carey J Acta Crystallogr F Struct Biol Commun. 2021 Jul 1;77(Pt 7):215-225. doi:, 10.1107/S2053230X21006142. Epub 2021 Jul 30. PMID:34196612<ref>PMID:34196612</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 6st6" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Ecoli]]
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[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Carey, J]]
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[[Category: Carey J]]
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[[Category: Drouard, F]]
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[[Category: Drouard F]]
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[[Category: Lawson, C L]]
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[[Category: Lawson CL]]
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[[Category: Leggio, L Lo]]
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[[Category: Linse S]]
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[[Category: Linse, S]]
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[[Category: Lo Leggio L]]
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[[Category: Schulz, A]]
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[[Category: Schulz A]]
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[[Category: Sprenger, J]]
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[[Category: Sprenger J]]
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[[Category: Wachenfeldt, C von]]
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[[Category: Von Wachenfeldt C]]
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[[Category: Dna binding protein]]
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[[Category: Domain swapping]]
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[[Category: Hostal]]
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[[Category: L-trp binding]]
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Current revision

Crystal Structure of Domain Swapped Trp Repressor V58I Variant

PDB ID 6st6

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