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1vpw

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Revision as of 07:39, 9 March 2017

STRUCTURE OF THE PURR MUTANT, L54M, BOUND TO HYPOXANTHINE AND PURF OPERATOR DNA

Structural highlights

1vpw is a 2 chain structure. 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

[PURR_ECOLI] Is the main repressor of the genes involved in the de novo synthesis of purine nucleotides, regulating purB, purC, purEK, purF, purHD, purL, purMN and guaBA expression. In addition, it participates in the regulation or coregulation of genes involved in de novo pyrimidine nucleotide biosynthesis, salvage and uptake (pyrC, pyrD, carAB and codBA), and of several genes encoding enzymes necessary for nucleotide and polyamine biosynthesis (prsA, glyA, gcvTHP, speA, glnB). Binds to a 16-bp palindromic sequence located within the promoter region of pur regulon genes. The consensus binding sequence is 5'-ACGCAAACGTTTTCNT-3'. PurR is allosterically activated to bind its cognate DNA by binding the purine corepressors, hypoxanthine or guanine, thereby effecting transcription repression.^[1] ^[2] ^[3] ^[4]

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 crystal structure of the purine repressor mutant L54M bound to hypoxanthine and to the purF operator provides a stereochemical understanding of the high DNA affinity of this hinge helix mutant. Comparison of the PurR L54M-DNA complex to that of the wild type PurR-DNA complex reveals that these purine repressors bind and kink DNA similarly despite significant differences in their minor groove contacts and routes to interdigitation of the central C.G:G.C base pair step. Modeling studies, supported by genetic and biochemical data, show that the stereochemistry of the backbone atoms of the abutting hinge helices combined with the rigidity of the kinked base pair step constrain the interdigitating residue to leucine or methionine for the LacI/GalR family of transcription regulators.

The structure of PurR mutant L54M shows an alternative route to DNA kinking.,Arvidson DN, Lu F, Faber C, Zalkin H, Brennan RG Nat Struct Biol. 1998 Jun;5(6):436-41. PMID:9628480^[5]

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

References

↑ Meng LM, Kilstrup M, Nygaard P. Autoregulation of PurR repressor synthesis and involvement of purR in the regulation of purB, purC, purL, purMN and guaBA expression in Escherichia coli. Eur J Biochem. 1990 Jan 26;187(2):373-9. PMID:2404765
↑ Rolfes RJ, Zalkin H. Purification of the Escherichia coli purine regulon repressor and identification of corepressors. J Bacteriol. 1990 Oct;172(10):5637-42. PMID:2211500
↑ Choi KY, Zalkin H. Structural characterization and corepressor binding of the Escherichia coli purine repressor. J Bacteriol. 1992 Oct;174(19):6207-14. PMID:1400170
↑ Devroede N, Thia-Toong TL, Gigot D, Maes D, Charlier D. Purine and pyrimidine-specific repression of the Escherichia coli carAB operon are functionally and structurally coupled. J Mol Biol. 2004 Feb 6;336(1):25-42. PMID:14741201
↑ Arvidson DN, Lu F, Faber C, Zalkin H, Brennan RG. The structure of PurR mutant L54M shows an alternative route to DNA kinking. Nat Struct Biol. 1998 Jun;5(6):436-41. PMID:9628480

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/1vpw"

@@ Line 1: / Line 1: @@
 ==STRUCTURE OF THE PURR MUTANT, L54M, BOUND TO HYPOXANTHINE AND PURF OPERATOR DNA==
 <StructureSection load='1vpw' size='340' side='right' caption='[[1vpw]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1vpw]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VPW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1VPW FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1vpw]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VPW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1VPW FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HPA:HYPOXANTHINE'>HPA</scene></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=1vpw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vpw OCA], [http://pdbe.org/1vpw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1vpw RCSB], [http://www.ebi.ac.uk/pdbsum/1vpw 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=1vpw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vpw OCA], [http://pdbe.org/1vpw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1vpw RCSB], [http://www.ebi.ac.uk/pdbsum/1vpw PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1vpw ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 34: / Line 35: @@
 __TOC__
 </StructureSection>
-[[Category: Bacillus coli migula 1895]]
+[[Category: Arvidson, D N]]
-[[Category: Arvidson, R G.Brennan D N]]
+[[Category: Brennan, R G]]
 [[Category: Faber, C]]
 [[Category: Lu, F]]

1vpw

From Proteopedia

Revision as of 07:39, 9 March 2017

STRUCTURE OF THE PURR MUTANT, L54M, BOUND TO HYPOXANTHINE AND PURF OPERATOR DNA

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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