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3gjn

From Proteopedia

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Following evolutionary paths to high affinity and selectivity protein-protein interactions using Colicin7 and Immunity proteins

Structural highlights

3gjn is a 4 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.48Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

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

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

How do intricate multi-residue features such as protein-protein interfaces evolve? To address this question, we evolved a new colicin-immunity binding interaction. We started with Im9, which inhibits its cognate DNase ColE9 at 10(-14) M affinity, and evolved it toward ColE7, which it inhibits promiscuously (Kd > 10(-8) M). Iterative rounds of random mutagenesis and selection toward higher affinity for ColE7, and selectivity (against ColE9 inhibition), led to an approximately 10(5)-fold increase in affinity and a 10(8)-fold increase in selectivity. Analysis of intermediates along the evolved variants revealed that changes in the binding configuration of the Im protein uncovered a latent set of interactions, thus providing the key to the rapid divergence of new Im7 variants. Overall, protein-protein interfaces seem to share the evolvability features of enzymes, that is, the exploitation of promiscuous interactions and alternative binding configurations via 'generalist' intermediates, and the key role of compensatory stabilizing mutations in facilitating the divergence of new functions.

Following evolutionary paths to protein-protein interactions with high affinity and selectivity.,Levin KB, Dym O, Albeck S, Magdassi S, Keeble AH, Kleanthous C, Tawfik DS Nat Struct Mol Biol. 2009 Oct;16(10):1049-55. Epub 2009 Sep 13. PMID:19749752^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Levin KB, Dym O, Albeck S, Magdassi S, Keeble AH, Kleanthous C, Tawfik DS. Following evolutionary paths to protein-protein interactions with high affinity and selectivity. Nat Struct Mol Biol. 2009 Oct;16(10):1049-55. Epub 2009 Sep 13. PMID:19749752 doi:10.1038/nsmb.1670

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3gjn"

Categories: Escherichia coli | Large Structures | Dym O | Tawfik DS

@@ Line 1: / Line 1: @@
 ==Following evolutionary paths to high affinity and selectivity protein-protein interactions using Colicin7 and Immunity proteins==
-<StructureSection load='3gjn' size='340' side='right' caption='[[3gjn]], [[Resolution|resolution]] 2.48&Aring;' scene=''>
+<StructureSection load='3gjn' size='340' side='right'caption='[[3gjn]], [[Resolution|resolution]] 2.48&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[3gjn]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3GJN OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3GJN FirstGlance]. <br>
+<table><tr><td colspan='2'>[[3gjn]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3GJN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3GJN FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.48&#8491;</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">imm, ceiE9 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895]), colE7, cea ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</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=3gjn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3gjn OCA], [http://pdbe.org/3gjn PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3gjn RCSB], [http://www.ebi.ac.uk/pdbsum/3gjn PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3gjn ProSAT]</span></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=3gjn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3gjn OCA], [https://pdbe.org/3gjn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3gjn RCSB], [https://www.ebi.ac.uk/pdbsum/3gjn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3gjn ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[http://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. [[http://www.uniprot.org/uniprot/CEA7_ECOLX CEA7_ECOLX]] This plasmid-coded bactericidal protein is an endonuclease active on both single- and double-stranded DNA but with undefined specificity.  Colicins are polypeptide toxins produced by and active against E.coli and closely related bacteria.
+[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]]
@@ Line 31: / Line 31: @@
 ==See Also==
-*[[Colicin|Colicin]]
+*[[Colicin 3D structures|Colicin 3D structures]]
 *[[Colicin Immunity Protein|Colicin Immunity Protein]]
-*[[Directed evolution|Directed evolution]]
+*[[Colicin immunity protein 3D structures|Colicin immunity protein 3D structures]]
-*[[Mutant immunity protein 9 (variant R12-13)|Mutant immunity protein 9 (variant R12-13)]]
-*[[Mutant immunity protein 9 (variant R12-2)|Mutant immunity protein 9 (variant R12-2)]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Bacillus coli migula 1895]]
+[[Category: Escherichia coli]]
-[[Category: Dym, O]]
+[[Category: Large Structures]]
-[[Category: Tawfik, D S]]
+[[Category: Dym O]]
-[[Category: Antibiotic]]
+[[Category: Tawfik DS]]
-[[Category: Antimicrobial]]
-[[Category: Bacteriocin]]
-[[Category: Bacteriocin immunity]]
-[[Category: Endonuclease]]
-[[Category: Hydrolase]]
-[[Category: Metal-binding]]
-[[Category: Nuclease]]
-[[Category: Protein-protein complex]]

3gjn

From Proteopedia

Current revision

Following evolutionary paths to high affinity and selectivity protein-protein interactions using Colicin7 and Immunity proteins

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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