1tkv

From Proteopedia

(Difference between revisions)

Revision as of 08:42, 21 March 2018

Solution Structure of T4 AsiA Dimer

Structural highlights

1tkv is a 2 chain structure with sequence from Bpt4. This structure supersedes the now removed PDB entry 1ka3. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	ASIA (BPT4)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ASIA_BPT4] Transcriptional inhibitor. Inhibits sigma 70-directed transcription by weakening its interaction with the core of the host's RNA polymerase. This allows Gp55 to successfully compete for the core enzyme. Plays an important role during the prereplicative period of phage T4 development.^[1] ^[2]

Evolutionary Conservation

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

Publication Abstract from PubMed

The bacteriophage T4 AsiA protein is a multifunctional protein that simultaneously acts as both a repressor and activator of gene expression during the phage life cycle. These dual roles with opposing transcriptional consequences are achieved by modification of the host RNA polymerase in which AsiA binds to conserved region 4 (SR4) of sigma(70), altering the pathway of promoter selection by the holoenzyme. The mechanism by which AsiA flips this genetic switch has now been revealed, in part, from the three-dimensional structure of AsiA and the elucidation of its interaction with SR4. The structure of AsiA is that of a novel homodimer in which each monomer is constructed as a seven-helix bundle arranged in four overlapping helix-loop-helix elements. Identification of the protein interfaces for both the AsiA homodimer and the AsiA-sigma(70) complex reveals that these interfaces are coincident. Thus, the AsiA interaction with sigma(70) necessitates that the AsiA homodimer dissociate to form an AsiA-SR4 heterodimer, exchanging one protein subunit for another to alter promoter choice by RNA polymerase.

Flipping a genetic switch by subunit exchange.,Lambert LJ, Schirf V, Demeler B, Cadene M, Werner MH EMBO J. 2001 Dec 17;20(24):7149-59. PMID:11742991^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Ouhammouch M, Orsini G, Brody EN. The asiA gene product of bacteriophage T4 is required for middle mode RNA synthesis. J Bacteriol. 1994 Jul;176(13):3956-65. PMID:8021178
↑ Lambert LJ, Wei Y, Schirf V, Demeler B, Werner MH. T4 AsiA blocks DNA recognition by remodeling sigma70 region 4. EMBO J. 2004 Aug 4;23(15):2952-62. Epub 2004 Jul 15. PMID:15257291 doi:10.1038/sj.emboj.7600312
↑ Lambert LJ, Schirf V, Demeler B, Cadene M, Werner MH. Flipping a genetic switch by subunit exchange. EMBO J. 2001 Dec 17;20(24):7149-59. PMID:11742991 doi:10.1093/emboj/20.24.7149

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1tkv"

@@ Line 1: / Line 1: @@
 ==Solution Structure of T4 AsiA Dimer==
 <StructureSection load='1tkv' size='340' side='right' caption='[[1tkv]], [[NMR_Ensembles_of_Models | 23 NMR models]]' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[1tkv]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bpt4 Bpt4]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1ka3 1ka3]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TKV OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1TKV FirstGlance]. <br>
 </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ASIA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10665 BPT4])</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1tkv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tkv OCA], [http://pdbe.org/1tkv PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1tkv RCSB], [http://www.ebi.ac.uk/pdbsum/1tkv PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1tkv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tkv OCA], [http://pdbe.org/1tkv PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1tkv RCSB], [http://www.ebi.ac.uk/pdbsum/1tkv PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1tkv ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 12: / Line 13: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/tk/1tkv_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/tk/1tkv_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1tkv

From Proteopedia

Revision as of 08:42, 21 March 2018

Solution Structure of T4 AsiA Dimer

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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