View source for 4wko


==Crystal structure of Helicobacter pylori 5'-methylthioadenosine/S-adenosyl homocysteine nucleosidase (MTAN) complexed with hydroxybutylthio-DADMe-Immucillin-A==
<StructureSection load='4wko' size='340' side='right' caption='[[4wko]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4wko]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Campylobacter_pylori_j99 Campylobacter pylori j99]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WKO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4WKO FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GMD:(3R,4S)-1-[(4-amino-5H-pyrrolo[3,2-d]pyrimidin-7-yl)methyl]-4-{[(4-hydroxybutyl)sulfanyl]methyl}pyrrolidin-3-ol'>GMD</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4ffs|4ffs]], [[4wkn|4wkn]], [[4wkc|4wkc]], [[4wkp|4wkp]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">mtnN, mtn, jhp_0082 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=85963 Campylobacter pylori J99])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Adenosylhomocysteine_nucleosidase Adenosylhomocysteine nucleosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.9 3.2.2.9] </span></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=4wko FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wko OCA], [http://pdbe.org/4wko PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4wko RCSB], [http://www.ebi.ac.uk/pdbsum/4wko PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4wko ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/MQMTN_HELPJ MQMTN_HELPJ]] Catalyzes the direct conversion of aminodeoxyfutalosine (AFL) into dehypoxanthine futalosine (DHFL) and adenine via the hydrolysis of the N-glycosidic bond; this reaction seems to represent an essential step in the menaquinone biosynthesis pathway in Helicobacter species. Also catalyzes the hydrolysis of 5'-methylthioadenosine (MTA) to adenine and 5'-methylthioribose. Can also probably use S-adenosylhomocysteine (SAH) as substrate, leading to adenine and S-ribosylhomocysteine. These other activities highlight the tremendous versatility of the enzyme, which also plays key roles in S-adenosylmethionine recycling and in the biosynthesis of the quorum-sensing molecule autoinducer-2.<ref>PMID:20954236</ref> <ref>PMID:22891633</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Helicobacter pylori is a Gram-negative bacterium that colonizes the gut of over 50% of the world's population. It is responsible for most peptic ulcers and is an important risk factor for gastric cancer. Antibiotic treatment for H. pylori infections is challenging as drug resistance has developed to antibiotics with traditional mechanisms of action. H. pylori uses an unusual pathway for menaquinone biosynthesis with 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) catalyzing an essential step. We validated MTAN as a target with a transition-state analogue of the enzyme [Wang, S.; Haapalainen, A. M.; Yan, F.; et al. Biochemistry 2012, 51, 6892-6894]. MTAN inhibitors will only be useful drug candidates if they can both include tight binding to the MTAN target and have the ability to penetrate the complex cell membrane found in Gram-negative H. pylori. Here we explore structural scaffolds for MTAN inhibition and for growth inhibition of cultured H. pylori. Sixteen analogues reported here are transition-state analogues of H. pylori MTAN with dissociation constants of 50 pM or below. Ten of these prevent growth of the H. pylori with IC90 values below 0.01 mug/mL. These remarkable compounds meet the criteria for potent inhibition and cell penetration. As a consequence, 10 new H. pylori antibiotic candidates are identified, all of which prevent H. pylori growth at concentrations 16-2000-fold lower than the five antibiotics, amoxicillin, metronidazole, levofloxacin, tetracyclin, and clarithromycin, commonly used to treat H. pylori infections. X-ray crystal structures of MTAN cocrystallized with several inhibitors show them to bind in the active site making interactions consistent with transition-state analogues.

New Antibiotic Candidates against Helicobacter pylori.,Wang S, Cameron SA, Clinch K, Evans GB, Wu Z, Schramm VL, Tyler PC J Am Chem Soc. 2015 Nov 18;137(45):14275-80. doi: 10.1021/jacs.5b06110. Epub 2015, Nov 9. PMID:26494017<ref>PMID:26494017</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4wko" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Adenosylhomocysteine nucleosidase]]
[[Category: Campylobacter pylori j99]]
[[Category: Almo, S C]]
[[Category: Cameron, S A]]
[[Category: Schramm, V L]]
[[Category: Wang, S]]
[[Category: Hydrolase]]
[[Category: Hydrolase-hydrolase inhibitor complex]]