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[[Image:1e0h.gif|left|200px]]
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{{STRUCTURE_1e0h|  PDB=1e0h  |  SCENE=  }}
'''INHIBITOR PROTEIN IM9 BOUND TO ITS PARTNER E9 DNASE'''


==Inhibitor Protein Im9 bound to its partner E9 DNase==
<StructureSection load='1e0h' size='340' side='right'caption='[[1e0h]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1e0h]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E0H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1E0H 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=1e0h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e0h OCA], [https://pdbe.org/1e0h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1e0h RCSB], [https://www.ebi.ac.uk/pdbsum/1e0h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1e0h ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IMM9_ECOLX IMM9_ECOLX] This protein is able to protect a cell, which harbors the plasmid ColE9 encoding colicin E9, against colicin E9, it binds specifically to the DNase-type colicin and inhibits its bactericidal activity.
== 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/e0/1e0h_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=1e0h ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The bacterial toxin colicin E9 is secreted by producing Escherichia coli cells with its 9.5 kDa inhibitor protein Im9 bound tightly to its 14.5 kDa C-terminal DNase domain. Double- and triple-resonance NMR spectra of the 24 kDa complex of uniformly 13C and 15N labeled Im9 bound to the unlabeled DNase domain have provided sufficient constraints for the solution structure of the bound Im9 to be determined. For the final ensemble of 20 structures, pairwise RMSDs for residues 3-84 were 0.76 +/- 0.14 A for the backbone atoms and 1.36 +/- 0.15 A for the heavy atoms. Representative solution structures of the free and bound Im9 are highly similar, with backbone and heavy atom RMSDs of 1.63 and 2.44 A, respectively, for residues 4-83, suggesting that binding does not cause a major conformational change in Im9. The NMR studies have also allowed the DNase contact surface on Im9 to be investigated through changes in backbone chemical shifts and NOEs between the two proteins determined from comparisons of 1H-1H-13C NOESY-HSQC spectra with and without 13C decoupling. The NMR-defined interface agrees well with that determined in a recent X-ray structure analysis with the major difference being that a surface loop of Im9, which is at the interface, has a different conformation in the solution and crystal structures. Tyr54, a key residue on the interface, is shown to exhibit NMR characteristics indicative of slow rotational flipping. A mechanistic description of the influence binding of Im9 has on the dynamic behavior of E9 DNase, which is known to exist in two slowly interchanging conformers in solution, is proposed.


==Overview==
NMR investigation of the interaction of the inhibitor protein Im9 with its partner DNase.,Boetzel R, Czisch M, Kaptein R, Hemmings AM, James R, Kleanthous C, Moore GR Protein Sci. 2000 Sep;9(9):1709-18. PMID:11045617<ref>PMID:11045617</ref>
The bacterial toxin colicin E9 is secreted by producing Escherichia coli cells with its 9.5 kDa inhibitor protein Im9 bound tightly to its 14.5 kDa C-terminal DNase domain. Double- and triple-resonance NMR spectra of the 24 kDa complex of uniformly 13C and 15N labeled Im9 bound to the unlabeled DNase domain have provided sufficient constraints for the solution structure of the bound Im9 to be determined. For the final ensemble of 20 structures, pairwise RMSDs for residues 3-84 were 0.76 +/- 0.14 A for the backbone atoms and 1.36 +/- 0.15 A for the heavy atoms. Representative solution structures of the free and bound Im9 are highly similar, with backbone and heavy atom RMSDs of 1.63 and 2.44 A, respectively, for residues 4-83, suggesting that binding does not cause a major conformational change in Im9. The NMR studies have also allowed the DNase contact surface on Im9 to be investigated through changes in backbone chemical shifts and NOEs between the two proteins determined from comparisons of 1H-1H-13C NOESY-HSQC spectra with and without 13C decoupling. The NMR-defined interface agrees well with that determined in a recent X-ray structure analysis with the major difference being that a surface loop of Im9, which is at the interface, has a different conformation in the solution and crystal structures. Tyr54, a key residue on the interface, is shown to exhibit NMR characteristics indicative of slow rotational flipping. A mechanistic description of the influence binding of Im9 has on the dynamic behavior of E9 DNase, which is known to exist in two slowly interchanging conformers in solution, is proposed.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1E0H is a [[Single protein]] structure of 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=1E0H OCA].
</div>
<div class="pdbe-citations 1e0h" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
NMR investigation of the interaction of the inhibitor protein Im9 with its partner DNase., Boetzel R, Czisch M, Kaptein R, Hemmings AM, James R, Kleanthous C, Moore GR, Protein Sci. 2000 Sep;9(9):1709-18. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11045617 11045617]
*[[Colicin immunity protein 3D structures|Colicin immunity protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Boetzel, R.]]
[[Category: Boetzel R]]
[[Category: Czisch, M.]]
[[Category: Czisch M]]
[[Category: Hemmings, A M.]]
[[Category: Hemmings AM]]
[[Category: James, R.]]
[[Category: James R]]
[[Category: Kaptein, R.]]
[[Category: Kaptein R]]
[[Category: Kleanthous, C.]]
[[Category: Kleanthous C]]
[[Category: Moore, G R.]]
[[Category: Moore GR]]
[[Category: Colicin immunity protein]]
[[Category: E-type colicin]]
[[Category: Inhibitor of e9 dnase]]
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