1tlh

From Proteopedia

(Difference between revisions)

Revision as of 08:49, 21 March 2018

T4 AsiA bound to sigma70 region 4

Structural highlights

1tlh is a 2 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895 and Bpt4. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1tkv, 1tl6
Gene:	ASIA (BPT4), RPOD, ALT, B3067 ("Bacillus coli" Migula 1895)
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] [RPOD_ECOLI] Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. This is the primary sigma factor of this bacterium.

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

Bacteriophage T4 AsiA is a versatile transcription factor capable of inhibiting host gene expression as an 'anti-sigma' factor while simultaneously promoting gene-specific expression of T4 middle genes in conjunction with T4 MotA. To accomplish this task, AsiA engages conserved region 4 of Eschericia coli sigma70, blocking recognition of most host promoters by sequestering the DNA-binding surface at the AsiA/sigma70 interface. The three-dimensional structure of an AsiA/region 4 complex reveals that the C-terminal alpha helix of region 4 is unstructured, while four other helices adopt a completely different conformation relative to the canonical structure of unbound region 4. That AsiA induces, rather than merely stabilizes, this rearrangement can be realized by comparison to the homologous structures of region 4 solved in a variety of contexts, including the structure of Thermotoga maritima sigmaA region 4 described herein. AsiA simultaneously occupies the surface of region 4 that ordinarily contacts core RNA polymerase (RNAP), suggesting that an AsiA-bound sigma70 may also undergo conformational changes in the context of the RNAP holoenzyme.

T4 AsiA blocks DNA recognition by remodeling sigma70 region 4.,Lambert LJ, Wei Y, Schirf V, Demeler B, Werner MH EMBO J. 2004 Aug 4;23(15):2952-62. Epub 2004 Jul 15. PMID:15257291^[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, 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

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

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

@@ Line 1: / Line 1: @@
 ==T4 AsiA bound to sigma70 region 4==
 <StructureSection load='1tlh' size='340' side='right' caption='[[1tlh]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1tkv|1tkv]], [[1tl6|1tl6]]</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]), RPOD, ALT, B3067 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</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=1tlh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tlh OCA], [http://pdbe.org/1tlh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1tlh RCSB], [http://www.ebi.ac.uk/pdbsum/1tlh 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=1tlh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tlh OCA], [http://pdbe.org/1tlh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1tlh RCSB], [http://www.ebi.ac.uk/pdbsum/1tlh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1tlh ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 13: / Line 14: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/tl/1tlh_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/tl/1tlh_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1tlh

From Proteopedia

Revision as of 08:49, 21 March 2018

T4 AsiA bound to sigma70 region 4

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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