5w98

<table><tr><td colspan='2'>[[5w98]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_23866 Atcc 23866]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5W98 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5W98 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pbtD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=35762 ATCC 23866])</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=5w98 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5w98 OCA], [http://pdbe.org/5w98 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5w98 RCSB], [http://www.ebi.ac.uk/pdbsum/5w98 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5w98 ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The [4+2] cycloaddition reaction is an enabling transformation in modern synthetic organic chemistry, but there are only limited examples of dedicated natural enzymes that can catalyze this transformation. Thiopeptides (or more formally thiazolyl peptides) are a class of thiazole-containing, highly modified, macrocyclic secondary metabolites made from ribosomally synthesized precursor peptides. The characteristic feature of these natural products is a six-membered nitrogenous heterocycle that is assembled via a formal [4+2] cycloaddition between two dehydroalanine (Dha) residues. This heteroannulation is entirely contingent on enzyme activity, although the mechanism of the requisite pyridine/dehydropiperidine synthase remains to be elucidated. The unusual aza-cylic product is distinct from the more common carbocyclic products of synthetic and biosynthetic [4+2] cycloaddition reactions. To elucidate the mechanism of cycloaddition, we have determined atomic resolution structures of the pyridine synthases involved in the biosynthesis of the thiopeptides thiomuracin (TbtD) and GE2270A (PbtD), in complex with substrates and product analogs. Structure-guided biochemical, mutational, computational, and binding studies elucidate active-site features that explain how orthologs can generate rigid macrocyclic scaffolds of different sizes. Notably, the pyridine synthases show structural similarity to the elimination domain of lanthipeptide dehydratases, wherein insertions of secondary structural elements result in the formation of a distinct active site that catalyzes different chemistry. Comparative analysis identifies other catalysts that contain a shared core protein fold but whose active sites are located in entirely different regions, illustrating a principle predicted from efforts in de novo protein design.

 

Structural insights into enzymatic [4+2] aza-cycloaddition in thiopeptide antibiotic biosynthesis.,Cogan DP, Hudson GA, Zhang Z, Pogorelov TV, van der Donk WA, Mitchell DA, Nair SK Proc Natl Acad Sci U S A. 2017 Nov 20. pii: 1716035114. doi:, 10.1073/pnas.1716035114. PMID:29158402<ref>PMID:29158402</ref>

 

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 5w98" style="background-color:#fffaf0;"></div>

[[Category: Atcc 23866]]

[[Category: Cogan, D P]]

[[Category: Nair, S K]]

[[Category: Biosynthetic protein]]

[[Category: Pyridine synthase]]