7s2x
From Proteopedia
(Difference between revisions)
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==Structure of SalC, a gamma-lactam-beta-lactone bicyclase for salinosporamide biosynthesis== | ==Structure of SalC, a gamma-lactam-beta-lactone bicyclase for salinosporamide biosynthesis== | ||
| - | <StructureSection load='7s2x' size='340' side='right'caption='[[7s2x]]' scene=''> | + | <StructureSection load='7s2x' size='340' side='right'caption='[[7s2x]], [[Resolution|resolution]] 2.85Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7S2X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7S2X FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[7s2x]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Salinispora_tropica Salinispora tropica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7S2X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7S2X FirstGlance]. <br> |
| - | </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=7s2x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7s2x OCA], [https://pdbe.org/7s2x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7s2x RCSB], [https://www.ebi.ac.uk/pdbsum/7s2x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7s2x ProSAT]</span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.85Å</td></tr> |
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EPE:4-(2-HYDROXYETHYL)-1-PIPERAZINE+ETHANESULFONIC+ACID'>EPE</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</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=7s2x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7s2x OCA], [https://pdbe.org/7s2x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7s2x RCSB], [https://www.ebi.ac.uk/pdbsum/7s2x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7s2x ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/B0L7F9_9ACTN B0L7F9_9ACTN] | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The marine microbial natural product salinosporamide A (marizomib) is a potent proteasome inhibitor currently in clinical trials for the treatment of brain cancer. Salinosporamide A is characterized by a complex and densely functionalized gamma-lactam-beta-lactone bicyclic warhead, the assembly of which has long remained a biosynthetic mystery. Here, we report an enzymatic route to the salinosporamide core catalyzed by a standalone ketosynthase (KS), SalC. Chemoenzymatic synthesis of carrier protein-tethered substrates, as well as intact proteomics, allowed us to probe the reactivity of SalC and understand its role as an intramolecular aldolase/beta-lactone synthase with roles in both transacylation and bond-forming reactions. Additionally, we present the 2.85-A SalC crystal structure that, combined with site-directed mutagenesis, allowed us to propose a bicyclization reaction mechanism. This work challenges our current understanding of the role of KS enzymes and establishes a basis for future efforts toward streamlined production of a clinically relevant chemotherapeutic. | ||
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| + | Enzymatic assembly of the salinosporamide gamma-lactam-beta-lactone anticancer warhead.,Bauman KD, Shende VV, Chen PY, Trivella DBB, Gulder TAM, Vellalath S, Romo D, Moore BS Nat Chem Biol. 2022 Mar 21. pii: 10.1038/s41589-022-00993-w. doi:, 10.1038/s41589-022-00993-w. PMID:35314816<ref>PMID:35314816</ref> | ||
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 7s2x" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
| + | [[Category: Salinispora tropica]] | ||
[[Category: Bauman KD]] | [[Category: Bauman KD]] | ||
[[Category: Chen PY-T]] | [[Category: Chen PY-T]] | ||
[[Category: Moore BS]] | [[Category: Moore BS]] | ||
[[Category: Trivella DBB]] | [[Category: Trivella DBB]] | ||
Current revision
Structure of SalC, a gamma-lactam-beta-lactone bicyclase for salinosporamide biosynthesis
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