1k7k

From Proteopedia

(Difference between revisions)

Revision as of 08:46, 21 April 2021

crystal structure of RdgB- inosine triphosphate pyrophosphatase from E. coli

Structural highlights

1k7k is a 1 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT, TOPSAN

Function

[RDGB_ECOLI] Pyrophosphatase that hydrolyzes the non-canonical purine nucleotides deoxyinosine triphosphate (dITP) and xanthosine triphosphate (XTP) as well as 2'-deoxy-N-6-hydroxylaminopurine triposphate (dHAPTP) to their respective monophosphate derivatives. Probably excludes non-canonical purines from DNA precursor pool, thus preventing their incorporation into DNA and avoiding chromosomal lesions.[HAMAP-Rule:MF_01405]^[1]

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

Inosine triphosphate pyrophosphatases, which are ubiquitous house-cleaning enzymes, hydrolyze noncanonical nucleoside triphosphates (inosine triphosphate (ITP) and xanthosine triphosphate (XTP)) and prevent the incorporation of hypoxanthine or xanthine into nascent DNA or RNA. Here we present the 1.5-A-resolution crystal structure of the inosine triphosphate pyrophosphatase RdgB from Escherichia coli in a free state and in complex with a substrate (ITP+Ca(2+)) or a product (inosine monophosphate (IMP)). ITP binding to RdgB induced a large displacement of the alpha1 helix, closing the enzyme active site. This positions the conserved Lys13 close to the bridging oxygen between the alpha- and beta-phosphates of the substrate, weakening the P(alpha)-O bond. On the other side of the substrate, the conserved Asp69 is proposed to act as a base coordinating the catalytic water molecule. Our data provide insight into the molecular mechanisms of the substrate selectivity and catalysis of RdgB and other ITPases.

Molecular basis of the antimutagenic activity of the house-cleaning inosine triphosphate pyrophosphatase RdgB from Escherichia coli.,Savchenko A, Proudfoot M, Skarina T, Singer A, Litvinova O, Sanishvili R, Brown G, Chirgadze N, Yakunin AF J Mol Biol. 2007 Dec 7;374(4):1091-103. Epub 2007 Oct 11. PMID:17976651^[2]

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

References

↑ Burgis NE, Cunningham RP. Substrate specificity of RdgB protein, a deoxyribonucleoside triphosphate pyrophosphohydrolase. J Biol Chem. 2007 Feb 9;282(6):3531-8. Epub 2006 Nov 6. PMID:17090528 doi:M608708200
↑ Savchenko A, Proudfoot M, Skarina T, Singer A, Litvinova O, Sanishvili R, Brown G, Chirgadze N, Yakunin AF. Molecular basis of the antimutagenic activity of the house-cleaning inosine triphosphate pyrophosphatase RdgB from Escherichia coli. J Mol Biol. 2007 Dec 7;374(4):1091-103. Epub 2007 Oct 11. PMID:17976651 doi:http://dx.doi.org/10.1016/j.jmb.2007.10.012

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/1k7k"

@@ Line 3: / Line 3: @@
 <StructureSection load='1k7k' size='340' side='right'caption='[[1k7k]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1k7k]] is a 1 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=1K7K OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1K7K FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1k7k]] is a 1 chain structure with sequence from [https://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=1K7K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1K7K FirstGlance]. <br>
 </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=1k7k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k7k OCA], [http://pdbe.org/1k7k PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1k7k RCSB], [http://www.ebi.ac.uk/pdbsum/1k7k PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1k7k ProSAT], [http://www.topsan.org/Proteins/MCSG/1k7k TOPSAN]</span></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=1k7k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k7k OCA], [https://pdbe.org/1k7k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1k7k RCSB], [https://www.ebi.ac.uk/pdbsum/1k7k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1k7k ProSAT], [https://www.topsan.org/Proteins/MCSG/1k7k TOPSAN]</span></td></tr>
 </table>
 == Function ==
-[[http://www.uniprot.org/uniprot/RDGB_ECOLI RDGB_ECOLI]] Pyrophosphatase that hydrolyzes the non-canonical purine nucleotides deoxyinosine triphosphate (dITP) and xanthosine triphosphate (XTP) as well as 2'-deoxy-N-6-hydroxylaminopurine triposphate (dHAPTP) to their respective monophosphate derivatives. Probably excludes non-canonical purines from DNA precursor pool, thus preventing their incorporation into DNA and avoiding chromosomal lesions.[HAMAP-Rule:MF_01405]<ref>PMID:17090528</ref>
+[[https://www.uniprot.org/uniprot/RDGB_ECOLI RDGB_ECOLI]] Pyrophosphatase that hydrolyzes the non-canonical purine nucleotides deoxyinosine triphosphate (dITP) and xanthosine triphosphate (XTP) as well as 2'-deoxy-N-6-hydroxylaminopurine triposphate (dHAPTP) to their respective monophosphate derivatives. Probably excludes non-canonical purines from DNA precursor pool, thus preventing their incorporation into DNA and avoiding chromosomal lesions.[HAMAP-Rule:MF_01405]<ref>PMID:17090528</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]

1k7k

From Proteopedia

Revision as of 08:46, 21 April 2021

crystal structure of RdgB- inosine triphosphate pyrophosphatase from E. coli

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox