View source for 5yzf


==X-ray crystal structure of met K42C sperm whale myoglobin==
<StructureSection load='5yzf' size='340' side='right' caption='[[5yzf]], [[Resolution|resolution]] 1.77&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5yzf]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YZF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5YZF FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></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=5yzf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yzf OCA], [http://pdbe.org/5yzf PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5yzf RCSB], [http://www.ebi.ac.uk/pdbsum/5yzf PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5yzf ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/MYG_PHYCD MYG_PHYCD]] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure and function of heme proteins are regulated by diverse post-translational modifications including heme-protein cross-links, with the underlying mechanisms not well understood. In this study, we introduced a Cys (K42C) close to the heme 4-vinyl group in sperm whale myoglobin (Mb) and solved its X-ray crystal structure. Interestingly, we found that K42C Mb can partially form a Cys-heme cross-link (termed K42C Mb-X) under dithiothreitol-induced reductive conditions in presence of O2, as suggested by guanidine hydrochloride-induced unfolding and heme extraction studies. Mass spectrometry (MS) studies, together with trypsin digestion studies, further indicated that a thioether bond is formed between Cys42 and the heme 4-vinyl group with an additional mass of 16Da, likely due to hydroxylation of the alphacarbon. We then proposed a plausible mechanism for the formation of the novel Cys-heme cross-link based on MS, kinetic UV-vis and electron paramagnetic resonance (EPR) studies. Moreover, the Cys-heme cross-link was shown to fine-tune the protein reactivity toward activation of H2O2. This study provides valuable insights into the post-translational modification of heme proteins, and also suggests that the Cys-heme cross-link can be induced to form in vitro, making it useful for design of new heme proteins with a non-dissociable heme and improved functions.

Formation of Cys-heme cross-link in K42C myoglobin under reductive conditions with molecular oxygen.,Cheng HM, Yuan H, Wang XJ, Xu JK, Gao SQ, Wen GB, Tan X, Lin YW J Inorg Biochem. 2018 Feb 19;182:141-149. doi: 10.1016/j.jinorgbio.2018.02.011. PMID:29477977<ref>PMID:29477977</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5yzf" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Yuan, H]]
[[Category: Myoglobin]]
[[Category: Oxygen transport]]