View source for 6tcd


==Crystal structure of Salmo salar RidA-2==
<StructureSection load='6tcd' size='340' side='right'caption='[[6tcd]], [[Resolution|resolution]] 1.36&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6tcd]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmo_salar Salmo salar]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6TCD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6TCD 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]] 1.36&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=6tcd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6tcd OCA], [https://pdbe.org/6tcd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6tcd RCSB], [https://www.ebi.ac.uk/pdbsum/6tcd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6tcd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/C0H8I4_SALSA C0H8I4_SALSA] Catalyzes the hydrolytic deamination of enamine/imine intermediates that form during the course of normal metabolism. May facilitate the release of ammonia from these potentially toxic reactive metabolites, reducing their impact on cellular components. It may act on enamine/imine intermediates formed by several types of pyridoxal-5'-phosphate-dependent dehydratases including L-threonine dehydratase.[ARBA:ARBA00002596]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Reactive Intermediate Deaminase (Rid) protein superfamily includes eight families among which the RidA is conserved in all domains of life. RidA proteins accelerate the deamination of the reactive 2-aminoacrylate (2AA), an enamine produced by some pyridoxal phosphate (PLP)-dependent enzymes. 2AA accumulation inhibits target enzymes with a detrimental impact on fitness. As a consequence of whole genome duplication, teleost fish have two ridA paralogs, while other extant vertebrates contain a single-copy gene. We investigated the biochemical properties of the products of two paralogs, identified in Salmo salar. SsRidA-1 and SsRidA-2 complemented the growth defect of a Salmonella enterica ridA mutant, an in vivo model of 2AA stress. In vitro, both proteins hydrolyzed 2-imino acids (IA) to keto-acids and ammonia. SsRidA-1 was active on IA derived from nonpolar amino acids and poorly active or inactive on IA derived from other amino acids tested. In contrast, SsRidA-2 had a generally low catalytic efficiency, but showed a relatively higher activity with IA derived from L-Glu and aromatic amino acids. The crystal structures of SsRidA-1 and SsRidA-2 provided hints of the remarkably different conformational stability and substrate specificity. Overall, SsRidA-1 is similar to the mammalian orthologs whereas SsRidA-2 displays unique properties likely generated by functional specialization of a duplicated ancestral gene.

Two novel fish paralogs provide insights into the Rid family of imine deaminases active in pre-empting enamine/imine metabolic damage.,Digiovanni S, Visentin C, Degani G, Barbiroli A, Chiara M, Regazzoni L, Di Pisa F, Borchert AJ, Downs DM, Ricagno S, Vanoni MA, Popolo L Sci Rep. 2020 Jun 23;10(1):10135. doi: 10.1038/s41598-020-66663-w. PMID:32576850<ref>PMID:32576850</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6tcd" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribonuclease 3D structures|Ribonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Salmo salar]]
[[Category: Bartorelli A]]
[[Category: Degani G]]
[[Category: Di Pisa F]]
[[Category: Digiovanni S]]
[[Category: Oberti L]]
[[Category: Popolo L]]
[[Category: Ricagno S]]
[[Category: Visentin C]]