1etk: Difference between revisions

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[[Image:1etk.gif|left|200px]]


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==THE CRYSTAL STRUCTURE OF E. COLI FIS MUTANT Q68A==
The line below this paragraph, containing "STRUCTURE_1etk", creates the "Structure Box" on the page.
<StructureSection load='1etk' size='340' side='right'caption='[[1etk]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1etk]] is a 2 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=1ETK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ETK FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1etk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1etk OCA], [https://pdbe.org/1etk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1etk RCSB], [https://www.ebi.ac.uk/pdbsum/1etk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1etk ProSAT]</span></td></tr>
{{STRUCTURE_1etk| PDB=1etk |  SCENE= }}
</table>
== Function ==
[https://www.uniprot.org/uniprot/FIS_ECOLI FIS_ECOLI] Activates ribosomal RNA transcription, as well other genes. Plays a direct role in upstream activation of rRNA promoters. Binds to a recombinational enhancer sequence that is required to stimulate hin-mediated DNA inversion. Prevents initiation of DNA replication from oriC.<ref>PMID:2209559</ref> <ref>PMID:8836178</ref>
== 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/et/1etk_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=1etk ConSurf].
<div style="clear:both"></div>


'''THE CRYSTAL STRUCTURE OF E. COLI FIS MUTANT Q68A'''
==See Also==
 
*[[FIS protein|FIS protein]]
 
== References ==
==Overview==
<references/>
The Fis protein regulates gene expression in Escherichia coli by activating or repressing transcription of a variety of genes. Fis can activate transcription when bound to DNA upstream of the RNA-polymerase-binding site, such as in the rrnB P1 promoter, or when bound to a site overlapping the -35 RNA polymerase binding site, such as in the proP P2 promoter. It has been suggested that transcriptional activation in both promoters results from interactions between specific amino acids within a turn connecting the B and C helices (the BC turn) in Fis and the C-terminal domain of the alpha-subunit of RNA polymerase (alphaCTD of RNAP). Here, crystal structures of six Fis BC turn mutants with different transcriptional activation properties, Q68A, R71Y, R71L, G72A, G72D and Q74A, were determined at 1.9 to 2.8 A resolution. Two of these mutants, R71Y and R71L, crystallized in unit cells which are different from that of wild-type Fis, and the structure of R71L offers the most complete Fis model to date in that the extended structure of the N-terminal region is revealed. The BC turn in all of these mutant structures remains in a nearly identical gamma gamma beta-turn conformation as present in wild-type Fis. Analyses of the molecular surfaces of the transactivation region of the mutants suggest that several residues in or near the BC turn, including Gln68, Arg71, Gly72 and Gln74, form a ridge that could contact the alphaCTD of RNAP on one side. The structures and biochemical properties of the mutants suggest that Arg71 is the most critical residue for contacting RNAP within this ridge and that the glycine at position 72 helps to stabilize the structure.
__TOC__
 
</StructureSection>
==About this Structure==
1ETK is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ETK OCA].
 
==Reference==
Structural analysis of the transcriptional activation on Fis: crystal structures of six Fis mutants with different activation properties., Cheng YS, Yang WZ, Johnson RC, Yuan HS, J Mol Biol. 2000 Oct 6;302(5):1139-51. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11183780 11183780]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Cheng, Y S.]]
[[Category: Cheng YS]]
[[Category: Johnson, R C.]]
[[Category: Johnson RC]]
[[Category: Yang, W Z.]]
[[Category: Yang WZ]]
[[Category: Yuan, H S.]]
[[Category: Yuan HS]]
[[Category: Dna-binding protein]]
[[Category: Transcriptional activation region]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 15:30:07 2008''

Latest revision as of 10:06, 7 February 2024

THE CRYSTAL STRUCTURE OF E. COLI FIS MUTANT Q68ATHE CRYSTAL STRUCTURE OF E. COLI FIS MUTANT Q68A

Structural highlights

1etk is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.1Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

FIS_ECOLI Activates ribosomal RNA transcription, as well other genes. Plays a direct role in upstream activation of rRNA promoters. Binds to a recombinational enhancer sequence that is required to stimulate hin-mediated DNA inversion. Prevents initiation of DNA replication from oriC.[1] [2]

Evolutionary Conservation

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

See Also

References

  1. ↑ Ross W, Thompson JF, Newlands JT, Gourse RL. E.coli Fis protein activates ribosomal RNA transcription in vitro and in vivo. EMBO J. 1990 Nov;9(11):3733-42. PMID:2209559
  2. ↑ Wold S, Crooke E, Skarstad K. The Escherichia coli Fis protein prevents initiation of DNA replication from oriC in vitro. Nucleic Acids Res. 1996 Sep 15;24(18):3527-32. PMID:8836178

1etk, resolution 2.10Å

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