2h2n

<StructureSection load='2h2n' size='340' side='right' caption='[[2h2n]], [[Resolution|resolution]] 2.30&Aring;' scene=''>

<table><tr><td colspan='2'>[[2h2n]] is a 2 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=2H2N OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2H2N FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1s18|1s18]], [[1s1d|1s1d]], [[2h2u|2h2u]]</td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CANT1, SHAPY ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Nucleoside_diphosphate_phosphatase Nucleoside diphosphate phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.1.6 3.6.1.6] </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=2h2n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2h2n OCA], [http://pdbe.org/2h2n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2h2n RCSB], [http://www.ebi.ac.uk/pdbsum/2h2n PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2h2n ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/CANT1_HUMAN CANT1_HUMAN]] Desbuquois syndrome. The disease is caused by mutations affecting the gene represented in this entry.

[[http://www.uniprot.org/uniprot/CANT1_HUMAN CANT1_HUMAN]] Calcium-dependent nucleotidase with a preference for UDP. The order of activity with different substrates is UDP > GDP > UTP > GTP. Has very low activity towards ADP and even lower activity towards ATP. Does not hydrolyze AMP and GMP. Involved in proteoglycan synthesis.<ref>PMID:12234496</ref> <ref>PMID:15248776</ref> <ref>PMID:22539336</ref>

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== Publication Abstract from PubMed ==

Mammals express a protein homologous to soluble nucleotidases used by blood-sucking insects to inhibit host blood clotting. These vertebrate nucleotidases may play a role in protein glycosylation. The activity of this enzyme family is strictly dependent on calcium, which induces a conformational change in the secreted, soluble human nucleotidase. The crystal structure of this human enzyme was recently solved; however, the mechanism of calcium activation and the basis for the calcium-induced changes remain unclear. In this study, using analytical ultracentrifugation and chemical cross-linking, we show that calcium or strontium induce noncovalent dimerization of the soluble human enzyme. The location and nature of the dimer interface was elucidated using a combination of site-directed mutagenesis and chemical cross-linking, coupled with crystallographic analyses. Replacement of Ile(170), Ser(172), and Ser(226) with cysteine residues resulted in calcium-dependent, sulfhydryl-specific intermolecular cross-linking, which was not observed after cysteine introduction at other surface locations. Analysis of a super-active mutant, E130Y, revealed that this mutant dimerized more readily than the wild-type enzyme. The crystal structure of the E130Y mutant revealed that the mutated residue is found in the dimer interface. In addition, expression of the full-length nucleotidase revealed that this membrane-bound form can also dimerize and that these dimers are stabilized by spontaneous oxidative cross-linking of Cys(30), located between the single transmembrane helix and the start of the soluble sequence. Thus, calcium-mediated dimerization may also represent a mechanism for regulation of the activity of this nucleotidase in the physiological setting of the endoplasmic reticulum or Golgi.

Calcium-dependent dimerization of human soluble calcium activated nucleotidase: characterization of the dimer interface.,Yang M, Horii K, Herr AB, Kirley TL J Biol Chem. 2006 Sep 22;281(38):28307-17. Epub 2006 Jul 11. PMID:16835225<ref>PMID:16835225</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 2h2n" style="background-color:#fffaf0;"></div>

[[Category: Human]]

[[Category: Nucleoside diphosphate phosphatase]]

[[Category: Herr, A B]]

[[Category: Horii, K]]

[[Category: Kirley, T L]]

[[Category: Yang, M]]

[[Category: Nucleotide-binding]]