5c6y: Difference between revisions
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==A sperm whale myoglobin double mutant L29H/F43Y Mb with a Tyr-heme cross-link== | |||
<StructureSection load='5c6y' size='340' side='right'caption='[[5c6y]], [[Resolution|resolution]] 1.79Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5c6y]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Physeter_catodon Physeter catodon]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5C6Y OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5C6Y 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]] 1.793Å</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></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=5c6y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5c6y OCA], [https://pdbe.org/5c6y PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5c6y RCSB], [https://www.ebi.ac.uk/pdbsum/5c6y PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5c6y ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/MYG_PHYMC MYG_PHYMC] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
A heme-protein cross-link is a key post-translational modification (PTM) of heme proteins. Meanwhile, the structural and functional consequences of heme-protein cross-links are not fully understood, due to limited studies on a direct comparison of the same protein with and without the cross-link. A Tyr-heme cross-link with a C-O bond is a newly discovered PTM of heme proteins, and is spontaneously formed in F43Y myoglobin (Mb) between the Tyr hydroxyl group and the heme 4-vinyl group in vivo. In this study, we found that with an additional distal His29 introduced in the heme pocket, the double mutant L29H/F43Y Mb can form two distinct forms under different protein purification conditions, with and without a novel Tyr-heme cross-link. By solving the X-ray structures of both forms of L29H/F43Y Mb and performing spectroscopic studies, we made a direct structural and functional comparison in the same protein scaffold. It revealed that the Tyr-heme cross-link regulates the heme distal hydrogen-bonding network, and fine-tunes not only the spectroscopic and ligand binding properties, but also the protein reactivity. Moreover, the formation of the Tyr-heme cross-link in the double mutant L29H/F43Y Mb was investigated in vitro. This study addressed the key issue of how Tyr-heme cross-link fine-tunes the structure and functions of the heme protein, and provided a plausible mechanism for the formation of the newly discovered Tyr-heme cross-link. | |||
How a novel tyrosine-heme cross-link fine-tunes the structure and functions of heme proteins: a direct comparitive study of L29H/F43Y myoglobin.,Yan DJ, Yuan H, Li W, Xiang Y, He B, Nie CM, Wen GB, Lin YW, Tan X Dalton Trans. 2015 Oct 27;44(43):18815-22. doi: 10.1039/c5dt03040d. PMID:26458300<ref>PMID:26458300</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: Lin | <div class="pdbe-citations 5c6y" style="background-color:#fffaf0;"></div> | ||
[[Category: | |||
[[Category: | ==See Also== | ||
*[[Myoglobin 3D structures|Myoglobin 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Physeter catodon]] | |||
[[Category: Lin YW]] | |||
[[Category: Tan XS]] | |||
[[Category: Yuan H]] | |||
Latest revision as of 19:07, 8 November 2023
A sperm whale myoglobin double mutant L29H/F43Y Mb with a Tyr-heme cross-linkA sperm whale myoglobin double mutant L29H/F43Y Mb with a Tyr-heme cross-link
Structural highlights
FunctionMYG_PHYMC Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. Publication Abstract from PubMedA heme-protein cross-link is a key post-translational modification (PTM) of heme proteins. Meanwhile, the structural and functional consequences of heme-protein cross-links are not fully understood, due to limited studies on a direct comparison of the same protein with and without the cross-link. A Tyr-heme cross-link with a C-O bond is a newly discovered PTM of heme proteins, and is spontaneously formed in F43Y myoglobin (Mb) between the Tyr hydroxyl group and the heme 4-vinyl group in vivo. In this study, we found that with an additional distal His29 introduced in the heme pocket, the double mutant L29H/F43Y Mb can form two distinct forms under different protein purification conditions, with and without a novel Tyr-heme cross-link. By solving the X-ray structures of both forms of L29H/F43Y Mb and performing spectroscopic studies, we made a direct structural and functional comparison in the same protein scaffold. It revealed that the Tyr-heme cross-link regulates the heme distal hydrogen-bonding network, and fine-tunes not only the spectroscopic and ligand binding properties, but also the protein reactivity. Moreover, the formation of the Tyr-heme cross-link in the double mutant L29H/F43Y Mb was investigated in vitro. This study addressed the key issue of how Tyr-heme cross-link fine-tunes the structure and functions of the heme protein, and provided a plausible mechanism for the formation of the newly discovered Tyr-heme cross-link. How a novel tyrosine-heme cross-link fine-tunes the structure and functions of heme proteins: a direct comparitive study of L29H/F43Y myoglobin.,Yan DJ, Yuan H, Li W, Xiang Y, He B, Nie CM, Wen GB, Lin YW, Tan X Dalton Trans. 2015 Oct 27;44(43):18815-22. doi: 10.1039/c5dt03040d. PMID:26458300[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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