View source for 9qnz


==Streptavidin 112Y-121W-124F with a thiophenol cofactor as artificial hydrogen atom transferase==
<StructureSection load='9qnz' size='340' side='right'caption='[[9qnz]], [[Resolution|resolution]] 1.88&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9qnz]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9QNZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9QNZ 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]] 1.88&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1I7Y:5-[(3~{a}~{S},4~{S},6~{a}~{R})-2-oxidanylidene-1,3,3~{a},4,6,6~{a}-hexahydrothieno[3,4-d]imidazol-4-yl]-~{N}-(3-sulfanylphenyl)pentanamide'>A1I7Y</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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=9qnz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9qnz OCA], [https://pdbe.org/9qnz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9qnz RCSB], [https://www.ebi.ac.uk/pdbsum/9qnz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9qnz ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SAV_STRAV SAV_STRAV] The biological function of streptavidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of streptavidin).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Biocatalytic hydrogen atom transfer (HAT) holds the potential to help address some long-standing challenges in organic synthesis. Although several families of enzymes rely on cysteine to perform HAT, these enzymes are rather impractical for synthetic purposes. To circumvent possible side reactions associated with cysteinyl radicals, we report herein artificial hydrogen atom transferases (AHATases) with an abiological thiophenol cofactor, capitalizing on biotin-streptavidin technology. Chemogenetic optimization afforded an AHATase with good reactivity and high enantioselectivity (er up to 93:7) for the photoinduced radical hydroamination of alkenes. Crystal structures suggest that aromatic-sulfur interactions are key contributing factors to cofactor anchoring and enantioinduction. Mechanistic studies support H atom abstraction and donation processes, both of which are catalyzed by the AHATase. Our work highlights the synthetic potential of thiol-based biocatalytic HAT and expands the repertoire of HAT biocatalysis.

An Asymmetric Hydrogen Atom Transferase with an Abiological Thiophenol Cofactor.,Cao H, Zhang K, Gorbachev V, Vornholt T, Yu K, Chen D, Ward TR J Am Chem Soc. 2025 Nov 3. doi: 10.1021/jacs.5c12516. PMID:41182164<ref>PMID:41182164</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9qnz" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces avidinii]]
[[Category: Ward TR]]
[[Category: Zhang K]]