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4qhs

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Revision as of 11:30, 15 February 2023

Crystal structure of AAA+sigma 54 activator domain of the flagellar regulatory protein FlrC of Vibrio cholerae in nucleotide free state

Structural highlights

4qhs is a 7 chain structure with sequence from Vibrio cholerae O395. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

A0A0H3AHP1_VIBC3

Publication Abstract from PubMed

Bacterial enhancer-binding proteins (bEBPs) oligomerize through AAA(+) domains and use ATP hydrolysis-driven energy to isomerize the RNA polymerase-sigma(54) complex during transcriptional initiation. Here, we describe the first structure of the central AAA(+) domain of the flagellar regulatory protein FlrC (FlrC(C)), a bEBP that controls flagellar synthesis in Vibrio cholerae. Our results showed that FlrC(C) forms heptamer both in nucleotide (Nt)-free and -bound states without ATP-dependent subunit remodeling. Unlike the bEBPs such as NtrC1 or PspF, a novel cis-mediated "all or none" ATP binding occurs in the heptameric FlrC(C), because constriction at the ATPase site, caused by loop L3 and helix alpha7, restricts the proximity of the trans-protomer required for Nt binding. A unique "closed to open" movement of Walker A, assisted by trans-acting "Glu switch" Glu-286, facilitates ATP binding and hydrolysis. Fluorescence quenching and ATPase assays on FlrC(C) and mutants revealed that although Arg-349 of sensor II, positioned by trans-acting Glu-286 and Tyr-290, acts as a key residue to bind and hydrolyze ATP, Arg-319 of alpha7 anchors ribose and controls the rate of ATP hydrolysis by retarding the expulsion of ADP. Heptameric state of FlrC(C) is restored in solution even with the transition state mimicking ADP.AlF3. Structural results and pulldown assays indicated that L3 renders an in-built geometry to L1 and L2 causing sigma(54)-FlrC(C) interaction independent of Nt binding. Collectively, our results underscore a novel mechanism of ATP binding and sigma(54) interaction that strives to understand the transcriptional mechanism of the bEBPs, which probably interact directly with the RNA polymerase-sigma(54) complex without DNA looping.

Unique ATPase site architecture triggers cis-mediated synchronized ATP binding in heptameric AAA+-ATPase domain of flagellar regulatory protein FlrC.,Dey S, Biswas M, Sen U, Dasgupta J J Biol Chem. 2015 Apr 3;290(14):8734-47. doi: 10.1074/jbc.M114.611434. Epub 2015 , Feb 16. PMID:25688103^[1]

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

References

↑ Dey S, Biswas M, Sen U, Dasgupta J. Unique ATPase site architecture triggers cis-mediated synchronized ATP binding in heptameric AAA+-ATPase domain of flagellar regulatory protein FlrC. J Biol Chem. 2015 Apr 3;290(14):8734-47. doi: 10.1074/jbc.M114.611434. Epub 2015 , Feb 16. PMID:25688103 doi:http://dx.doi.org/10.1074/jbc.M114.611434

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4qhs"

@@ Line 3: / Line 3: @@
 <StructureSection load='4qhs' size='340' side='right'caption='[[4qhs]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[4qhs]] is a 7 chain structure with sequence from [http://en.wikipedia.org/wiki/Vibc3 Vibc3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QHS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4QHS FirstGlance]. <br>
+<table><tr><td colspan='2'>[[4qhs]] is a 7 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_cholerae_O395 Vibrio cholerae O395]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QHS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QHS FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene></td></tr>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene></td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">flrC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=345073 VIBC3])</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=4qhs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qhs OCA], [https://pdbe.org/4qhs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qhs RCSB], [https://www.ebi.ac.uk/pdbsum/4qhs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qhs ProSAT]</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=4qhs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qhs OCA], [http://pdbe.org/4qhs PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4qhs RCSB], [http://www.ebi.ac.uk/pdbsum/4qhs PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4qhs ProSAT]</span></td></tr>
 </table>
+== Function ==
+[https://www.uniprot.org/uniprot/A0A0H3AHP1_VIBC3 A0A0H3AHP1_VIBC3]
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 22: / Line 23: @@
 </StructureSection>
 [[Category: Large Structures]]
-[[Category: Vibc3]]
+[[Category: Vibrio cholerae O395]]
-[[Category: Biswas, M]]
+[[Category: Biswas M]]
-[[Category: Dasgupta, J]]
+[[Category: Dasgupta J]]
-[[Category: Dey, S]]
+[[Category: Dey S]]
-[[Category: Sen, U]]
+[[Category: Sen U]]
-[[Category: Aaa+ atpase domain]]
-[[Category: Atpase activity]]
-[[Category: Transcription]]

4qhs

From Proteopedia

Revision as of 11:30, 15 February 2023

Crystal structure of AAA+sigma 54 activator domain of the flagellar regulatory protein FlrC of Vibrio cholerae in nucleotide free state

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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