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==SOLUTION STRUCTURES OF THE C-TERMINAL DOMAIN OF DIPHTHERIA TOXIN REPRESSOR== | |||
<StructureSection load='1bym' size='340' side='right'caption='[[1bym]]' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1bym]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Corynebacterium_diphtheriae Corynebacterium diphtheriae]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BYM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BYM 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=1bym FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bym OCA], [https://pdbe.org/1bym PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bym RCSB], [https://www.ebi.ac.uk/pdbsum/1bym PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bym ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/DTXR_CORDI DTXR_CORDI] Iron-binding repressor of the dipheteria toxin gene expression. May serve as a global regulator of gene expression. Represses ripA under iron excess. | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/by/1bym_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1bym ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The diphtheria toxin repressor (DtxR) is the best-characterized member of a family of homologous proteins that regulate iron uptake and virulence gene expression in the Gram-positive bacteria. DtxR contains two domains that are separated by a short, unstructured linker. The N-terminal domain is structurally well-defined and is responsible for Fe2+ binding, dimerization, and DNA binding. The C-terminal domain adopts a fold similar to eukaryotic Src homology 3 domains, but the functional role of the C-terminal domain in repressor activity is unknown. The solution structure of the C-terminal domain, consisting of residues N130-L226 plus a 13-residue N-terminal extension, has been determined by using NMR spectroscopy. Residues before A147 are highly mobile and adopt a random coil conformation, but residues A147-L226 form a single structured domain consisting of five beta-strands and three helices arranged into a partially orthogonal, two-sheet beta-barrel, similar to the structure observed in the crystalline Co2+ complex of full-length DtxR. Chemical shift perturbation studies demonstrate that a proline-rich peptide corresponding to residues R125-G139 of intact DtxR binds to the C-terminal domain in a pocket formed by residues in beta-strands 2, 3, and 5, and helix 3. Binding of the proline-rich peptide by the C-terminal domain of DtxR presents an example of peptide binding by a prokaryotic Src homology 3-like protein. The results of this study, combined with previous x-ray studies of intact DtxR, provide insights into a possible biological function of the C-terminal domain in regulating repressor activity. | |||
Solution structure and peptide binding studies of the C-terminal src homology 3-like domain of the diphtheria toxin repressor protein.,Wang G, Wylie GP, Twigg PD, Caspar DL, Murphy JR, Logan TM Proc Natl Acad Sci U S A. 1999 May 25;96(11):6119-24. PMID:10339551<ref>PMID:10339551</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1bym" style="background-color:#fffaf0;"></div> | |||
== | ==See Also== | ||
*[[Diphtheria toxin repressor|Diphtheria toxin repressor]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Corynebacterium diphtheriae]] | [[Category: Corynebacterium diphtheriae]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Caspar | [[Category: Caspar DLD]] | ||
[[Category: Logan | [[Category: Logan TM]] | ||
[[Category: Murphy | [[Category: Murphy JR]] | ||
[[Category: Twigg | [[Category: Twigg PD]] | ||
[[Category: Wang | [[Category: Wang G]] | ||
[[Category: Wylie | [[Category: Wylie GP]] | ||
Latest revision as of 11:20, 22 May 2024
SOLUTION STRUCTURES OF THE C-TERMINAL DOMAIN OF DIPHTHERIA TOXIN REPRESSORSOLUTION STRUCTURES OF THE C-TERMINAL DOMAIN OF DIPHTHERIA TOXIN REPRESSOR
Structural highlights
FunctionDTXR_CORDI Iron-binding repressor of the dipheteria toxin gene expression. May serve as a global regulator of gene expression. Represses ripA under iron excess. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe diphtheria toxin repressor (DtxR) is the best-characterized member of a family of homologous proteins that regulate iron uptake and virulence gene expression in the Gram-positive bacteria. DtxR contains two domains that are separated by a short, unstructured linker. The N-terminal domain is structurally well-defined and is responsible for Fe2+ binding, dimerization, and DNA binding. The C-terminal domain adopts a fold similar to eukaryotic Src homology 3 domains, but the functional role of the C-terminal domain in repressor activity is unknown. The solution structure of the C-terminal domain, consisting of residues N130-L226 plus a 13-residue N-terminal extension, has been determined by using NMR spectroscopy. Residues before A147 are highly mobile and adopt a random coil conformation, but residues A147-L226 form a single structured domain consisting of five beta-strands and three helices arranged into a partially orthogonal, two-sheet beta-barrel, similar to the structure observed in the crystalline Co2+ complex of full-length DtxR. Chemical shift perturbation studies demonstrate that a proline-rich peptide corresponding to residues R125-G139 of intact DtxR binds to the C-terminal domain in a pocket formed by residues in beta-strands 2, 3, and 5, and helix 3. Binding of the proline-rich peptide by the C-terminal domain of DtxR presents an example of peptide binding by a prokaryotic Src homology 3-like protein. The results of this study, combined with previous x-ray studies of intact DtxR, provide insights into a possible biological function of the C-terminal domain in regulating repressor activity. Solution structure and peptide binding studies of the C-terminal src homology 3-like domain of the diphtheria toxin repressor protein.,Wang G, Wylie GP, Twigg PD, Caspar DL, Murphy JR, Logan TM Proc Natl Acad Sci U S A. 1999 May 25;96(11):6119-24. PMID:10339551[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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