View source for 7ceu


==Crystal structure of L-cycloserine-bound form of cysteine desulfurase NifS from Helicobacter pylori==
<StructureSection load='7ceu' size='340' side='right'caption='[[7ceu]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7ceu]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Helicobacter_pylori_26695 Helicobacter pylori 26695]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7CEU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7CEU 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]] 2.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=7TS:(5-HYDROXY-6-METHYL-4-{[(3-OXO-2,3-DIHYDRO-1,2-OXAZOL-4-YL)AMINO]METHYL}PYRIDIN-3-YL)METHYL+DIHYDROGEN+PHOSPHATE'>7TS</scene>, <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</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=7ceu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ceu OCA], [https://pdbe.org/7ceu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ceu RCSB], [https://www.ebi.ac.uk/pdbsum/7ceu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ceu ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ISCS_HELPY ISCS_HELPY] Master enzyme that delivers sulfur to a number of partners involved in Fe-S cluster assembly, tRNA modification or cofactor biosynthesis. Catalyzes the removal of elemental sulfur atoms from cysteine to produce alanine. Functions as a sulfur delivery protein for Fe-S cluster synthesis onto IscU, an Fe-S scaffold assembly protein, as well as other S acceptor proteins.
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== Publication Abstract from PubMed ==
The cysteine desulfurase SufS is a pyridoxal-5'-phosphate-dependent enzyme and is essential for the SUF system, which participates in iron-sulfur cluster biosynthesis. Inhibition of SufS in the SUF system by D-cycloserine (DCS) in Plasmodium falciparum apicoplast has recently been reported, indicating that SufS could be a target for malaria therapeutics. However, the mechanistic details underlying the inhibition of SufS by DCS have not yet been clarified. Moreover, inhibition of SufS by the other enantiomer, L-cycloserine (LCS), has not been investigated. Herein, we investigated the structure-based inhibition mechanisms of SufS by DCS and LCS using Bacillus subtilis SufS, whose catalytic mechanism has been well characterized in comparison to that of the P. falciparum SufS. Surprisingly, DCS- and LCS-mediated inhibitions of SufS occur via distinct mechanisms resulting in pyridoxamine-5'-phosphate (PMP) in DCS-mediated inhibition and PMP-3-hydroxyisoxazole adduct (PMP-isoxazole) in LCS-mediated inhibition. Biochemical and structural evaluation of SufS variants identified conserved His and Arg residues at the active site as the key determinants of the distinct inhibition mechanisms. The importance of structural elements involved in DCS and LCS-mediated inhibitions of SufS provides valuable insights for the structure-based design of new drugs targeting SufS. DATABASE: Structural data are available in PDB database under the accession numbers 6KFY, 7CEO, 7CEP, 7CEQ, 7CER, 7CES, 7CET, 7CEU, 7E6A, 7E6B, 7E6C, 7E6D, 7E6E, and 7E6F.

Cycloserine enantiomers inhibit PLP-dependent cysteine desulfurase SufS via distinct mechanisms.,Nakamura R, Ogawa S, Takahashi Y, Fujishiro T FEBS J. 2022 Apr 8. doi: 10.1111/febs.16455. PMID:35395703<ref>PMID:35395703</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7ceu" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cysteine desulfurase 3D structures|Cysteine desulfurase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Helicobacter pylori 26695]]
[[Category: Large Structures]]
[[Category: Fujishiro T]]
[[Category: Nakamura R]]
[[Category: Takahashi Y]]