View source for 9emu


==RosC-8-demethyl-8-amino-FMN - Phosphate complex==
<StructureSection load='9emu' size='340' side='right'caption='[[9emu]], [[Resolution|resolution]] 1.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9emu]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_davaonensis Streptomyces davaonensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9EMU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9EMU 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]] 1.4&#8491;</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=9emu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9emu OCA], [https://pdbe.org/9emu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9emu RCSB], [https://www.ebi.ac.uk/pdbsum/9emu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9emu ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/K4R812_STRDJ K4R812_STRDJ] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The antibiotic roseoflavin is a riboflavin (vitamin B(2)) analog. One step of the roseoflavin biosynthetic pathway is catalyzed by the phosphatase RosC, which dephosphorylates 8-demethyl-8-amino-riboflavin-5'-phosphate (AFP) to 8-demethyl-8-amino-riboflavin (AF). RosC also catalyzes the potentially cell-damaging dephosphorylation of the AFP analog riboflavin-5'-phosphate also called "flavin mononucleotide" (FMN), however, with a lower efficiency. We performed X-ray structural analyses and mutagenesis studies on RosC from Streptomyces davaonensis to understand binding of the flavin substrates, the distinction between AFP and FMN and the catalytic mechanism of this enzyme. This work is the first structural analysis of an AFP phosphatase. Each monomer of the RosC dimer consists of an alpha/beta-fold core, which is extended by three specific elongated strand-to-helix sections and a specific N-terminal helix. Altogether these segments envelope the flavin thereby forming a novel flavin-binding site. We propose that distinction between AFP and FMN is provided by substrate-induced rigidification of the four RosC specific supplementary segments mentioned above and by an interaction between the amino group at C8 of AFP and the beta-carboxylate of D166. This key amino acid is involved in binding the ring system of AFP and positioning its ribitol phosphate part. Accordingly, site-specific exchanges at D166 disturbed the active site geometry of the enzyme and drastically reduced the catalytic activity. Based on the structure of the catalytic core we constructed a whole series of RosC variants but a disturbing, FMN dephosphorylating "killer enzyme", was not generated.

The Phosphatase RosC from Streptomyces davaonensis is Used for Roseoflavin Biosynthesis and has Evolved to Largely Prevent Dephosphorylation of the Important Cofactor Riboflavin-5'-phosphate.,Joshi T, Demmer U, Schneider C, Glaser T, Warkentin E, Ermler U, Mack M J Mol Biol. 2024 Aug 2;436(20):168734. doi: 10.1016/j.jmb.2024.168734. PMID:39097184<ref>PMID:39097184</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9emu" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces davaonensis]]
[[Category: Demmer U]]
[[Category: Ermler U]]
[[Category: Mack M]]