View source for 8khn


==Crystal structure of human methionine aminopeptidase 12 (MAP12) in complex with two cobalt ions==
<StructureSection load='8khn' size='340' side='right'caption='[[8khn]], [[Resolution|resolution]] 1.51&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8khn]] 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=8KHN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8KHN FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.51&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</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=8khn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8khn OCA], [https://pdbe.org/8khn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8khn RCSB], [https://www.ebi.ac.uk/pdbsum/8khn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8khn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MAP12_HUMAN MAP12_HUMAN] Removes the N-terminal methionine from nascent proteins. The N-terminal methionine is often cleaved when the second residue in the primary sequence is small and uncharged (Met-Ala-, Cys, Gly, Pro, Ser, Thr, or Val). Requires deformylation of the N(alpha)-formylated initiator methionine before it can be hydrolyzed (By similarity). May play a role in colon tumorigenesis.[HAMAP-Rule:MF_03174]<ref>PMID:16568094</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Isozymes are enzymes that catalyze identical biological reactions, yet exhibit slight variations in structures and catalytic efficiency, which enables the precise adjustment of metabolism to fulfill the specific requirements of a particular tissue or stage of development. Methionine aminopeptidase (MetAP) isozymes function a critical role in cleaving N-terminal methionine from nascent proteins to generate functional proteins. In humans, two distinct MetAP types I and II have been identified, with type I further categorized into cytosolic (MetAP1) and mitochondrial (MetAP1D) variants. However, despite extensive structural studies on both bacterial and human cytosolic MetAPs, the structural information remains unavailable for human mitochondrial MetAP. This study was aimed to elucidate the high-resolution structures of human mitochondrial MetAP1D in its apo-, cobalt-, and methionine-bound states. Through a comprehensive analysis of the determined structures and a docking simulation model with mitochondrial substrate peptides, we present mechanistic insights into the cleavage process of the initiator methionine from mitochondrial proteins. Notably, despite the shared features at the active site between the cytosolic and mitochondrial MetAP type I isozymes, we identified distinct structural disparities within the active-site pocket primarily contributed by two specific loops that could play a role in accommodating specific substrates. These structural insights offer a basis for the further exploration of MetAP isozymes as critical players in cellular processes and potential therapeutic applications.

Structural insights into N-terminal methionine cleavage by the human mitochondrial methionine aminopeptidase, MetAP1D.,Lee Y, Kim H, Lee E, Hahn H, Heo Y, Jang DM, Kwak K, Kim HJ, Kim HS Sci Rep. 2023 Dec 15;13(1):22326. doi: 10.1038/s41598-023-49332-6. PMID:38102161<ref>PMID:38102161</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8khn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Hahn H]]
[[Category: Heo Y]]
[[Category: Jang DM]]
[[Category: Kim H]]
[[Category: Kim HJ]]
[[Category: Kim HS]]
[[Category: Lee E]]
[[Category: Lee Y]]