View source for 2gpe


==Structure of the DNA-binding domain of E. Coli Proline Utilization A (PUTA)==
<StructureSection load='2gpe' size='340' side='right'caption='[[2gpe]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2gpe]] 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=2GPE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GPE 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IMD:IMIDAZOLE'>IMD</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=2gpe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gpe OCA], [https://pdbe.org/2gpe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gpe RCSB], [https://www.ebi.ac.uk/pdbsum/2gpe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gpe ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PUTA_ECOLI PUTA_ECOLI] Oxidizes proline to glutamate for use as a carbon and nitrogen source and also function as a transcriptional repressor of the put operon.
== 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/gp/2gpe_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=2gpe ConSurf].
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== Publication Abstract from PubMed ==
PutA (proline utilization A) from Escherichia coli is a 1320-amino-acid residue protein that is both a bifunctional proline catabolic enzyme and an autogenous transcriptional repressor. Here, we report the first crystal structure of a PutA DNA-binding domain along with functional analysis of a mutant PutA defective in DNA binding. Crystals were grown using a polypeptide corresponding to residues 1-52 of E. coli PutA (PutA52). The 2.1 Angstrom resolution structure of PutA52 mutant Lys9Met was determined using Se-Met MAD phasing, and the structure of native PutA52 was solved at 1.9 Angstrom resolution using molecular replacement. Residues 3-46 form a ribbon-helix-helix (RHH) substructure, thus establishing PutA as the largest protein to contain an RHH domain. The PutA RHH domain forms the intertwined dimer with tightly packed hydrophobic core that is characteristic of the RHH family. The structures were used to examine the three-dimensional context of residues conserved in PutA RHH domains. Homology modeling suggests that Lys9 and Thr5 contact DNA bases through the major groove, while Arg15, Thr28, and His30 may interact with the phosphate backbone. Lys9 is shown to be essential for specific recognition of put control DNA using gel shift analysis of the Lys9Met mutant of full-length PutA. Lys9 is disordered in the PutA52 structure, which implies an induced-fit binding mechanism in which the side chain of Lys9 becomes ordered through interaction with DNA. These results provide new insights into the structural basis of DNA recognition by PutA and reveal three-dimensional structural details of the PutA dimer interface.

Crystal structures of the DNA-binding domain of Escherichia coli proline utilization A flavoprotein and analysis of the role of Lys9 in DNA recognition.,Larson JD, Jenkins JL, Schuermann JP, Zhou Y, Becker DF, Tanner JJ Protein Sci. 2006 Nov;15(11):2630-41. Epub 2006 Sep 25. PMID:17001030<ref>PMID:17001030</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2gpe" style="background-color:#fffaf0;"></div>

==See Also==
*[[Proline utilization A|Proline utilization A]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Jenkins JL]]
[[Category: Larson J]]
[[Category: Tanner JJ]]