1d1m: Difference between revisions

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New page: left|200px<br /><applet load="1d1m" size="450" color="white" frame="true" align="right" spinBox="true" caption="1d1m, resolution 2.05Å" /> '''CRYSTAL STRUCTURE OF...
 
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[[Image:1d1m.gif|left|200px]]<br /><applet load="1d1m" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1d1m, resolution 2.05&Aring;" />
'''CRYSTAL STRUCTURE OF CRO K56-[DGEVK]-F58W MUTANT'''<br />


==Overview==
==CRYSTAL STRUCTURE OF CRO K56-[DGEVK]-F58W MUTANT==
It was previously shown that the Cro repressor from phage lambda, which is, a dimer, can be converted into a stable monomer by a five-amino acid, insertion. Phe58 is the key residue involved in this transition, switching, from interactions which stabilize the dimer to those which stabilize the, monomer. Structural studies, however, suggested that Phe58 did not, penetrate into the core of the monomer as well as it did into the native, dimer. This was strongly supported by the finding that certain, core-repacking mutations, including in particular, Phe58--&gt;Trp, increased, the stability of the monomer. Unexpectedly, the same substitution also, increased the stability of the native dimer. At the same time it decreased, the affinity of the dimer for operator DNA. Here we describe the crystal, structures of the Cro F58W mutant, both as the monomer and as the dimer., The F58W monomer crystallized in a form different from that of the, original monomer. In contrast to that structure, which resembled the, DNA-bound form of Cro, the F58W monomer is closer in structure to, wild-type (i.e. non-bound) Cro. The F58W dimer also crystallizes in a form, different from the native dimer but has a remarkably similar overall, structure which tends to confirm the large changes in conformation of Cro, on binding DNA. Introduction of Trp58 perturbs the position occupied by, the side-chain of Arg38, a DNA-contact residue, providing a structural, explanation for the reduction in DNA-binding affinity.The improved thermal, stability is seen to be due to the enhanced solvent transfer free energy, of Trp58 relative to Phe58, supplemented in the dimer structure, although, not the monomer, by a reduction in volume of internal cavities.
<StructureSection load='1d1m' size='340' side='right'caption='[[1d1m]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
 
== Structural highlights ==
==About this Structure==
<table><tr><td colspan='2'>[[1d1m]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_Lambda Escherichia virus Lambda]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1D1M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1D1M FirstGlance]. <br>
1D1M is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_lambda Enterobacteria phage lambda]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1D1M OCA].  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.05&#8491;</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=1d1m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1d1m OCA], [https://pdbe.org/1d1m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1d1m RCSB], [https://www.ebi.ac.uk/pdbsum/1d1m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1d1m ProSAT]</span></td></tr>
==Reference==
</table>
The structural basis for enhanced stability and reduced DNA binding seen in engineered second-generation Cro monomers and dimers., Rupert PB, Mollah AK, Mossing MC, Matthews BW, J Mol Biol. 2000 Mar 3;296(4):1079-90. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10686105 10686105]
== Function ==
[[Category: Enterobacteria phage lambda]]
[https://www.uniprot.org/uniprot/RCRO_LAMBD RCRO_LAMBD] Cro represses genes normally expressed in early phage development and is necessary for the late stage of lytic growth. It does this by binding to the OL and OR operators regions normally used by the repressor protein for lysogenic maintenance.
[[Category: Single protein]]
== Evolutionary Conservation ==
[[Category: Matthews, B.W.]]
[[Image:Consurf_key_small.gif|200px|right]]
[[Category: Mollah, A.K.]]
Check<jmol>
[[Category: Mossing, M.C.]]
  <jmolCheckbox>
[[Category: Rupert, P.B.]]
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/d1/1d1m_consurf.spt"</scriptWhenChecked>
[[Category: helix-turn-helix]]
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
 
    <text>to colour the structure by Evolutionary Conservation</text>
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 12:56:00 2007''
  </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=1d1m ConSurf].
<div style="clear:both"></div>
__TOC__
</StructureSection>
[[Category: Escherichia virus Lambda]]
[[Category: Large Structures]]
[[Category: Matthews BW]]
[[Category: Mollah AK]]
[[Category: Mossing MC]]
[[Category: Rupert PB]]

Latest revision as of 09:47, 7 February 2024

CRYSTAL STRUCTURE OF CRO K56-[DGEVK]-F58W MUTANTCRYSTAL STRUCTURE OF CRO K56-[DGEVK]-F58W MUTANT

Structural highlights

1d1m is a 2 chain structure with sequence from Escherichia virus Lambda. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.05Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RCRO_LAMBD Cro represses genes normally expressed in early phage development and is necessary for the late stage of lytic growth. It does this by binding to the OL and OR operators regions normally used by the repressor protein for lysogenic maintenance.

Evolutionary Conservation

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

1d1m, resolution 2.05Å

Drag the structure with the mouse to rotate

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