1ct8: Difference between revisions
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==CATALYTIC ANTIBODY 7C8 COMPLEX== | |||
<StructureSection load='1ct8' size='340' side='right'caption='[[1ct8]], [[Resolution|resolution]] 2.20Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1ct8]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CT8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CT8 FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TAA:[4-(2,2,2-TRIFLUORO-ACETYLAMINO)-BENZYL]-PHOSPHONIC+ACID+MONO-[2-(2,2-DICHLORO-1-HYDROXY-ETHYLAMINO)-3-HYDROXY-1-(4-NITRO-PHENYL)-PROPYL]+ESTER'>TAA</scene></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=1ct8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ct8 OCA], [https://pdbe.org/1ct8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ct8 RCSB], [https://www.ebi.ac.uk/pdbsum/1ct8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ct8 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/IGKC_MOUSE IGKC_MOUSE] | |||
== 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/ct/1ct8_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1ct8 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
BACKGROUND: Small organic molecules coupled to a carrier protein elicit an antibody response on immunisation. The diversity of this response has been found to be very narrow in several cases. Some antibodies also catalyse chemical reactions. Such catalytic antibodies are usually identified among those that bind tightly to an analogue of the transition state (TSA) of the relevant reaction; therefore, catalytic antibodies are also thought to have restricted diversity. To further characterise this diversity, we investigated the structure and biochemistry of the catalytic antibody 7C8, one of the most efficient of those which enhance the hydrolysis of chloramphenicol esters, and compared it to the other catalytic antibodies elicited in the same immunisation. RESULTS: The structure of a complex of the 7C8 antibody Fab fragment with the hapten TSA used to elicit it was determined at 2.2 A resolution. Structural comparison with another catalytic antibody (6D9) raised against the same hapten revealed that the two antibodies use different binding modes. Furthermore, whereas 6D9 catalyses hydrolysis solely by transition-state stabilisation, data on 7C8 show that the two antibodies use mechanisms where the catalytic residue, substrate specificity and rate-limiting step differ. CONCLUSIONS: Our results demonstrate that substantial diversity may be present among antibodies catalysing the same reaction. Therefore, some of these antibodies represent different starting points for mutagenesis aimed at boosting their activity. This increases the chance of obtaining more proficient catalysts and provides opportunities for tailoring catalysts with different specificities. | |||
Diverse structural solutions to catalysis in a family of antibodies.,Gigant B, Tsumuraya T, Fujii I, Knossow M Structure. 1999 Nov 15;7(11):1385-93. PMID:10574796<ref>PMID:10574796</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1ct8" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[ | *[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]] | ||
== References == | |||
== | <references/> | ||
< | __TOC__ | ||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
[[Category: Fujii | [[Category: Fujii I]] | ||
[[Category: Gigant | [[Category: Gigant B]] | ||
[[Category: Knossow | [[Category: Knossow M]] | ||
[[Category: Tsumuraya | [[Category: Tsumuraya T]] | ||
Latest revision as of 02:52, 21 November 2024
CATALYTIC ANTIBODY 7C8 COMPLEXCATALYTIC ANTIBODY 7C8 COMPLEX
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBACKGROUND: Small organic molecules coupled to a carrier protein elicit an antibody response on immunisation. The diversity of this response has been found to be very narrow in several cases. Some antibodies also catalyse chemical reactions. Such catalytic antibodies are usually identified among those that bind tightly to an analogue of the transition state (TSA) of the relevant reaction; therefore, catalytic antibodies are also thought to have restricted diversity. To further characterise this diversity, we investigated the structure and biochemistry of the catalytic antibody 7C8, one of the most efficient of those which enhance the hydrolysis of chloramphenicol esters, and compared it to the other catalytic antibodies elicited in the same immunisation. RESULTS: The structure of a complex of the 7C8 antibody Fab fragment with the hapten TSA used to elicit it was determined at 2.2 A resolution. Structural comparison with another catalytic antibody (6D9) raised against the same hapten revealed that the two antibodies use different binding modes. Furthermore, whereas 6D9 catalyses hydrolysis solely by transition-state stabilisation, data on 7C8 show that the two antibodies use mechanisms where the catalytic residue, substrate specificity and rate-limiting step differ. CONCLUSIONS: Our results demonstrate that substantial diversity may be present among antibodies catalysing the same reaction. Therefore, some of these antibodies represent different starting points for mutagenesis aimed at boosting their activity. This increases the chance of obtaining more proficient catalysts and provides opportunities for tailoring catalysts with different specificities. Diverse structural solutions to catalysis in a family of antibodies.,Gigant B, Tsumuraya T, Fujii I, Knossow M Structure. 1999 Nov 15;7(11):1385-93. PMID:10574796[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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