3ci1

<table><tr><td colspan='2'>[[3ci1]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Atcc_23272 Atcc 23272]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3CI1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3CI1 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=B12:COBALAMIN'>B12</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2nt8|2nt8]], [[3ci3|3ci3]], [[3ci4|3ci4]]</div></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">cobA ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1598 ATCC 23272])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Cob(I)yrinic_acid_a,c-diamide_adenosyltransferase Cob(I)yrinic acid a,c-diamide adenosyltransferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.17 2.5.1.17] </span></td></tr>

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== Publication Abstract from PubMed ==

ATP:cob(I)alamin adenosyltransferases (ACAs) catalyze the transfer of the 5'-deoxyadenosyl moiety from ATP to the upper axial ligand position of cobalamin in the synthesis of coenzyme B 12. For the ACA-catalyzed reaction to proceed, cob(II)alamin must be reduced to cob(I)alamin in the enzyme active site. This reduction is facilitated through the generation of a four-coordinate cob(II)alamin intermediate on the enzyme. We have determined the high-resolution crystal structure of a human-type ACA from Lactobacillus reuteri with a four-coordinate cob(II)alamin bound in the enzyme active site and with the product, adenosylcobalamin, partially occupied in the active site. The assembled structures represent snapshots of the steps in the ACA-catalyzed formation of the cobalt-carbon bond of coenzyme B 12. The structures define the corrinoid binding site and provide visual evidence for a base-off, four-coordinate cob(II)alamin intermediate. The complete structural description of ACA-mediated catalysis reveals the molecular features of four-coordinate cob(II)alamin stabilization and provides additional insights into the molecular basis for dysfunction in human patients suffering from methylmalonic aciduria.

Structural characterization of a human-type corrinoid adenosyltransferase confirms that coenzyme B12 is synthesized through a four-coordinate intermediate.,St Maurice M, Mera P, Park K, Brunold TC, Escalante-Semerena JC, Rayment I Biochemistry. 2008 May 27;47(21):5755-66. Epub 2008 May 2. PMID:18452306<ref>PMID:18452306</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 3ci1" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Atcc 23272]]

[[Category: Escalante-Semerena, J C]]

[[Category: Maurice, M St]]

[[Category: Mera, P E]]

[[Category: Rayment, I]]

[[Category: Transferase]]