View source for 4o7x


==Crystal structure of human ALKBH5 in complex with Mn2+==
<StructureSection load='4o7x' size='340' side='right'caption='[[4o7x]], [[Resolution|resolution]] 1.78&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4o7x]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4O7X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4O7X FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></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=4o7x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4o7x OCA], [https://pdbe.org/4o7x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4o7x RCSB], [https://www.ebi.ac.uk/pdbsum/4o7x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4o7x ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ALKB5_HUMAN ALKB5_HUMAN] Dioxygenase that demethylates RNA by oxidative demethylation: specifically demethylates N(6)-methyladenosine (m(6)A) RNA, the most prevalent internal modification of messenger RNA (mRNA) in higher eukaryotes. Requires molecular oxygen, alpha-ketoglutarate and iron. Demethylation of m(6)A mRNA affects mRNA processing and export and is required for spermatogenesis.<ref>PMID:21264265</ref> <ref>PMID:23177736</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
N(6)-Methylation of adenosine is the most ubiquitous and abundant modification of nucleoside in eukaryotic mRNA and long non-coding RNA. This modification plays an essential role in the regulation of mRNA translation and RNA metabolism. Recently, human AlkB homolog 5 (Alkbh5) and fat mass- and obesity-associated protein (FTO) were shown to erase this methyl modification on mRNA. Here, we report five high resolution crystal structures of the catalytic core of Alkbh5 in complex with different ligands. Compared with other AlkB proteins, Alkbh5 displays several unique structural features on top of the conserved double-stranded beta-helix fold typical of this protein family. Among the unique features, a distinct "lid" region of Alkbh5 plays a vital role in substrate recognition and catalysis. An unexpected disulfide bond between Cys-230 and Cys-267 is crucial for the selective binding of Alkbh5 to single-stranded RNA/DNA by bringing a "flipping" motif toward the central beta-helix fold. We generated a substrate binding model of Alkbh5 based on a demethylation activity assay of several structure-guided site-directed mutants. Crystallographic and biochemical studies using various analogs of alpha-ketoglutarate revealed that the active site cavity of Alkbh5 is much smaller than that of FTO and preferentially binds small molecule inhibitors. Taken together, our findings provide a structural basis for understanding the substrate recognition specificity of Alkbh5 and offer a foundation for selective drug design against AlkB members.

Crystal structures of the human RNA demethylase Alkbh5 reveal basis for substrate recognition.,Feng C, Liu Y, Wang G, Deng Z, Zhang Q, Wu W, Tong Y, Cheng C, Chen Z J Biol Chem. 2014 Apr 25;289(17):11571-83. doi: 10.1074/jbc.M113.546168. Epub, 2014 Mar 10. PMID:24616105<ref>PMID:24616105</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4o7x" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dioxygenase 3D structures|Dioxygenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Chen Z]]
[[Category: Feng C]]
[[Category: Liu Y]]