This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

3s5a

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 16:44, 5 August 2016

ABH2 cross-linked to undamaged dsDNA-2 with cofactors

Structural highlights

3s5a is a 3 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , ,
Related:	3bty, 3s57
Gene:	ABH2, ALKBH2 (HUMAN)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ALKB2_HUMAN] Dioxygenase that repairs alkylated DNA and RNA containing 1-methyladenine and 3-methylcytosine by oxidative demethylation. Can also repair alkylated DNA containing 1-ethenoadenine (in vitro). Has strong preference for double-stranded DNA. Has low efficiency with single-stranded substrates. Requires molecular oxygen, alpha-ketoglutarate and iron.^[1] ^[2] ^[3] ^[4] ^[5]

Publication Abstract from PubMed

ALKBH2 is a direct DNA repair dioxygenase guarding the mammalian genome against N(1)-methyladenine, N(3)-methylcytosine and 1,N(6)-ethenoadenine damage. A prerequisite for repair is to identify these lesions in the genome. Here we present crystal structures of human ALKBH2 bound to different duplex DNAs. Together with computational and biochemical analyses, our results suggest that DNA interrogation by ALKBH2 has two previously unknown features: (i) ALKBH2 probes base-pair stability and detects base pairs with reduced stability, and (ii) ALKBH2 does not have nor need a damage-checking site, which is critical for preventing spurious base cleavage for several glycosylases. The demethylation mechanism of ALKBH2 insures that only cognate lesions are oxidized and reversed to normal bases, and that a flipped, non-substrate base remains intact in the active site. Overall, the combination of duplex interrogation and oxidation chemistry allows ALKBH2 to detect and process diverse lesions efficiently and correctly.

Duplex interrogation by a direct DNA repair protein in search of base damage.,Yi C, Chen B, Qi B, Zhang W, Jia G, Zhang L, Li CJ, Dinner AR, Yang CG, He C Nat Struct Mol Biol. 2012 Jun 3;19(7):671-6. doi: 10.1038/nsmb.2320. PMID:22659876^[6]

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

References

↑ Duncan T, Trewick SC, Koivisto P, Bates PA, Lindahl T, Sedgwick B. Reversal of DNA alkylation damage by two human dioxygenases. Proc Natl Acad Sci U S A. 2002 Dec 24;99(26):16660-5. Epub 2002 Dec 16. PMID:12486230 doi:10.1073/pnas.262589799
↑ Aas PA, Otterlei M, Falnes PO, Vagbo CB, Skorpen F, Akbari M, Sundheim O, Bjoras M, Slupphaug G, Seeberg E, Krokan HE. Human and bacterial oxidative demethylases repair alkylation damage in both RNA and DNA. Nature. 2003 Feb 20;421(6925):859-63. PMID:12594517 doi:10.1038/nature01363
↑ Lee DH, Jin SG, Cai S, Chen Y, Pfeifer GP, O'Connor TR. Repair of methylation damage in DNA and RNA by mammalian AlkB homologues. J Biol Chem. 2005 Nov 25;280(47):39448-59. Epub 2005 Sep 20. PMID:16174769 doi:M509881200
↑ Ringvoll J, Moen MN, Nordstrand LM, Meira LB, Pang B, Bekkelund A, Dedon PC, Bjelland S, Samson LD, Falnes PO, Klungland A. AlkB homologue 2-mediated repair of ethenoadenine lesions in mammalian DNA. Cancer Res. 2008 Jun 1;68(11):4142-9. doi: 10.1158/0008-5472.CAN-08-0796. PMID:18519673 doi:http://dx.doi.org/10.1158/0008-5472.CAN-08-0796
↑ Yang CG, Yi C, Duguid EM, Sullivan CT, Jian X, Rice PA, He C. Crystal structures of DNA/RNA repair enzymes AlkB and ABH2 bound to dsDNA. Nature. 2008 Apr 24;452(7190):961-5. PMID:18432238 doi:http://dx.doi.org/10.1038/nature06889
↑ Yi C, Chen B, Qi B, Zhang W, Jia G, Zhang L, Li CJ, Dinner AR, Yang CG, He C. Duplex interrogation by a direct DNA repair protein in search of base damage. Nat Struct Mol Biol. 2012 Jun 3;19(7):671-6. doi: 10.1038/nsmb.2320. PMID:22659876 doi:10.1038/nsmb.2320

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3s5a"

@@ Line 1: / Line 1: @@
 ==ABH2 cross-linked to undamaged dsDNA-2 with cofactors==
 <StructureSection load='3s5a' size='340' side='right' caption='[[3s5a]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[3s5a]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3S5A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3S5A FirstGlance]. <br>
+<table><tr><td colspan='2'>[[3s5a]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3S5A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3S5A FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AKG:2-OXOGLUTARIC+ACID'>AKG</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=XL3:PROPANE-1-THIOL'>XL3</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3bty|3bty]], [[3s57|3s57]]</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ABH2, ALKBH2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ABH2, ALKBH2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=3s5a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3s5a OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3s5a RCSB], [http://www.ebi.ac.uk/pdbsum/3s5a 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=3s5a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3s5a OCA], [http://pdbe.org/3s5a PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3s5a RCSB], [http://www.ebi.ac.uk/pdbsum/3s5a PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3s5a ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 3s5a" style="background-color:#fffaf0;"></div>
 ==See Also==
@@ Line 25: / Line 27: @@
 __TOC__
 </StructureSection>
-[[Category: Homo sapiens]]
+[[Category: Human]]
 [[Category: Chen, B]]
 [[Category: Dinner, A R]]

3s5a

From Proteopedia

Revision as of 16:44, 5 August 2016

ABH2 cross-linked to undamaged dsDNA-2 with cofactors

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox