View source for 12rh


==Structure of turkey hemoglobin A covalently bound with epigallocatechin gallate==
<StructureSection load='12rh' size='340' side='right'caption='[[12rh]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[12rh]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Meleagris_gallopavo Meleagris gallopavo]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=12RH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=12RH 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]] 1.995&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=KDH:(2R,3R)-5,7-DIHYDROXY-2-(3,4,5-TRIHYDROXYPHENYL)-3,4-DIHYDRO-2H-CHROMEN-3-YL+3,4,5-TRIHYDROXYBENZOATE'>KDH</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=12rh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=12rh OCA], [https://pdbe.org/12rh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=12rh RCSB], [https://www.ebi.ac.uk/pdbsum/12rh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=12rh ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/P84479_MELGA P84479_MELGA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We investigated the binding of epigallocatechin gallate (EGCG) to turkey hemoglobin A (Hb), noting that polyphenols have the capacity to inhibit oxidative deterioration in muscle foods mediated by endogenous hemoglobin. The addition of EGCG to MetHb resulted in covalently bound EGCG to Cys(130) of both alpha-chains. The crystal structure showed that each bound EGCG was located near the other and in the protein interior. Distances between the nearest phenol/phenolate of bound EGCG and the nearest iron atom of the heme moieties were 11.7-16.5 A. Antioxidative characteristics due to bound EGCG included decreases in both hemin dissociation and H(2)O(2)-mediated ferryl Hb formation, counterbalanced by increased Hb autoxidation. Bound EGCG less effectively inhibited oxyHb-mediated lipid oxidation compared to MetHb-mediated lipid oxidation. The mechanisms by which EGCG adduction affected oxidative characteristics of Hb are discussed, including electron transfer from bound EGCG to the heme, interactions with lipids, and effects of cross-linking on hemin affinity.

Oxidative Characteristics of Turkey Hemoglobin A Containing Covalently Bound Epigallocatechin Gallate.,Yin J, Zhang W, Tatiyaborworntham N, Bingman CA, Richards MP J Agric Food Chem. 2026 Jun 9. doi: 10.1021/acs.jafc.5c17482. PMID:42262311<ref>PMID:42262311</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 12rh" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Meleagris gallopavo]]
[[Category: Bingman CA]]
[[Category: Richards MP]]
[[Category: Smith RW]]
[[Category: Yin J]]