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==Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G==
==Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G==
<StructureSection load='1mpe' size='340' side='right'caption='[[1mpe]], [[NMR_Ensembles_of_Models | 21 NMR models]]' scene=''>
<StructureSection load='1mpe' size='340' side='right'caption='[[1mpe]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1mpe]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Strsg Strsg]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MPE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MPE FirstGlance]. <br>
<table><tr><td colspan='2'>[[1mpe]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_sp._'group_G' Streptococcus sp. 'group G']. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MPE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MPE FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1gb1|1gb1]]</div></td></tr>
</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='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SPG ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1320 STRSG])</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=1mpe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mpe OCA], [https://pdbe.org/1mpe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mpe RCSB], [https://www.ebi.ac.uk/pdbsum/1mpe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mpe 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=1mpe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mpe OCA], [https://pdbe.org/1mpe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mpe RCSB], [https://www.ebi.ac.uk/pdbsum/1mpe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mpe ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/SPG1_STRSG SPG1_STRSG]] Binds to the constant Fc region of IgG with high affinity.  
[https://www.uniprot.org/uniprot/SPG1_STRSG SPG1_STRSG] Binds to the constant Fc region of IgG with high affinity.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1mpe ConSurf].
</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=1mpe ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure of a mutant immunoglobulin-binding B1 domain of streptococcal protein G (GB1), which comprises five conservative changes in hydrophobic core residues, was determined by NMR spectroscopy and X-ray crystallography. The oligomeric state and quaternary structure of the mutant protein are drastically changed from the wild type protein. The mutant structure consists of a symmetric tetramer, with intermolecular strand exchange involving all four units. Four of the five secondary structure elements present in the monomeric wild type GB1 structure are retained in the tetrameric structure, although their intra- and intermolecular interactions are altered. Our results demonstrate that through the acquisition of a moderate number of pivotal point mutations, proteins such as GB1 are able to undergo drastic structural changes, overcoming reduced stability of the monomeric unit by multimerization. The present structure is an illustrative example of how proteins exploit the breadth of conformational space.
Core mutations switch monomeric protein GB1 into an intertwined tetramer.,Kirsten Frank M, Dyda F, Dobrodumov A, Gronenborn AM Nat Struct Biol. 2002 Nov;9(11):877-85. PMID:12379842<ref>PMID:12379842</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1mpe" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Protein G|Protein G]]
*[[Protein G|Protein G]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Strsg]]
[[Category: Streptococcus sp. 'group G']]
[[Category: Dobrodumov, A]]
[[Category: Dobrodumov A]]
[[Category: Dyda, F]]
[[Category: Dyda F]]
[[Category: Frank, M K]]
[[Category: Frank MK]]
[[Category: Gronenborn, A M]]
[[Category: Gronenborn AM]]
[[Category: Channel]]
[[Category: Protein binding]]
[[Category: Strand-exchanged tetramer]]

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