View source for 1rqm


==SOLUTION STRUCTURE OF THE K18G/R82E ALICYCLOBACILLUS ACIDOCALDARIUS THIOREDOXIN MUTANT==
<StructureSection load='1rqm' size='340' side='right'caption='[[1rqm]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1rqm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Alicyclobacillus_acidocaldarius Alicyclobacillus acidocaldarius]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RQM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1RQM FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=1rqm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rqm OCA], [https://pdbe.org/1rqm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1rqm RCSB], [https://www.ebi.ac.uk/pdbsum/1rqm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1rqm ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/THIO_ALIAC THIO_ALIAC] Participates in various redox reactions through the reversible oxidation of its active center dithiol to a disulfide and catalyzes dithiol-disulfide exchange reactions.
== 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/rq/1rqm_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=1rqm ConSurf].
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== Publication Abstract from PubMed ==
No general strategy for thermostability has been yet established, because the extra stability of thermophiles appears to be the sum of different cumulative stabilizing interactions. In addition, the increase of conformational rigidity observed in many thermophilic proteins, which in some cases disappears when mesophilic and thermophilic proteins are compared at their respective physiological temperatures, suggests that evolutionary adaptation tends to maintain corresponding states with respect to conformational flexibility. In this study, we accomplished a structural analysis of the K18G/R82E Alicyclobacillus acidocaldarius thioredoxin (BacTrx) mutant, which has reduced heat resistance with respect to the thermostable wild-type. Furthermore, we have also achieved a detailed study, carried out at 25, 45, and 65 degrees C, of the backbone dynamics of both the BacTrx and its K18G/R82E mutant. Our findings clearly indicate that the insertion of the two mutations causes a loss of energetically favorable long-range interactions and renders the secondary structure elements of the double mutants more similar to those of the mesophilic Escherichia coli thioredoxin. Moreover, protein dynamics analysis shows that at room temperature the BacTrx, as well as the double mutant, are globally as rigid as the mesophilic thioredoxins; differently, at 65 degrees C, which is in the optimal growth temperature range of A. acidocaldarius, the wild-type retains its rigidity while the double mutant is characterized by a large increase of the amplitude of the internal motions. Finally, our research interestingly shows that fast motions on the pico- to nanosecond time scale are not detrimental to protein stability and provide an entropic stabilization of the native state. This study further confirms that protein thermostability is reached through diverse stabilizing interactions, which have the key role to maintain the structural folding stable and functional at the working temperature.

Solution structure and backbone dynamics of the K18G/R82E Alicyclobacillus acidocaldarius thioredoxin mutant: a molecular analysis of its reduced thermal stability.,Leone M, Di Lello P, Ohlenschlager O, Pedone EM, Bartolucci S, Rossi M, Di Blasio B, Pedone C, Saviano M, Isernia C, Fattorusso R Biochemistry. 2004 May 25;43(20):6043-58. PMID:15147188<ref>PMID:15147188</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Thioredoxin 3D structures|Thioredoxin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Alicyclobacillus acidocaldarius]]
[[Category: Large Structures]]
[[Category: Bartolucci S]]
[[Category: Di Blasio B]]
[[Category: Di Lello P]]
[[Category: Fattorusso R]]
[[Category: Isernia C]]
[[Category: Leone M]]
[[Category: Ohlenschlager O]]
[[Category: Pedone C]]
[[Category: Pedone EM]]
[[Category: Rossi M]]
[[Category: Saviano M]]