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| | <StructureSection load='6ckm' size='340' side='right'caption='[[6ckm]], [[Resolution|resolution]] 1.54Å' scene=''> | | <StructureSection load='6ckm' size='340' side='right'caption='[[6ckm]], [[Resolution|resolution]] 1.54Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6ckm]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"diplokokkus_intracellularis_meningitidis"_(sic)_weichselbaum_1887 "diplokokkus intracellularis meningitidis" (sic) weichselbaum 1887]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CKM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6CKM FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6ckm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Neisseria_meningitidis Neisseria meningitidis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6CKM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6CKM FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NCC:CYTIDINE-5-MONOPHOSPHATE-5-N-ACETYLNEURAMINIC+ACID'>NCC</scene></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]] 1.543Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">neuA, siaB, synB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=487 "Diplokokkus intracellularis meningitidis" (sic) Weichselbaum 1887])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NCC:CYTIDINE-5-MONOPHOSPHATE-5-N-ACETYLNEURAMINIC+ACID'>NCC</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/N-acylneuraminate_cytidylyltransferase N-acylneuraminate cytidylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.43 2.7.7.43] </span></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=6ckm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ckm OCA], [https://pdbe.org/6ckm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ckm RCSB], [https://www.ebi.ac.uk/pdbsum/6ckm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ckm ProSAT]</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=6ckm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ckm OCA], [http://pdbe.org/6ckm PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ckm RCSB], [http://www.ebi.ac.uk/pdbsum/6ckm PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ckm ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/NEUA_NEIME NEUA_NEIME] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: N-acylneuraminate cytidylyltransferase]] | + | [[Category: Neisseria meningitidis]] |
| - | [[Category: Chen, X]] | + | [[Category: Chen X]] |
| - | [[Category: Fisher, A J]] | + | [[Category: Fisher AJ]] |
| - | [[Category: Matthews, M M]] | + | [[Category: Matthews MM]] |
| - | [[Category: Cmp-transferase]]
| + | |
| - | [[Category: Polysaccharide synthesis]]
| + | |
| - | [[Category: Sialic acid-activator]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
NEUA_NEIME
Publication Abstract from PubMed
Cytidine 5'-monophosphate (CMP)-sialic acid synthetase (CSS) is an essential enzyme involved in the biosynthesis of carbohydrates and glycoconjugates containing sialic acids, a class of alpha-keto acids that are generally terminal key recognition residues by many proteins that play important biological and pathological roles. The CSS from Neisseria meningitidis (NmCSS) has been commonly used with other enzymes such as sialic acid aldolase and/or sialyltransferase in synthesizing a diverse array of compounds containing sialic acid or its naturally occurring and non-natural derivatives. To better understand its catalytic mechanism and substrate promiscuity, four NmCSS crystal structures trapped at various stages of the catalytic cycle with bound substrates, substrate analogues, and products have been obtained and are presented here. These structures suggest a mechanism for an "open" and "closed" conformational transition that occurs as sialic acid binds to the NmCSS/cytidine-5'-triphosphate (CTP) complex. The closed conformation positions critical residues to help facilitate the nucleophilic attack of sialic acid C2-OH to the alpha-phosphate of CTP, which is also aided by two observed divalent cations. Product formation drives the active site opening, promoting the release of products.
Catalytic Cycle of Neisseria meningitidis CMP-Sialic Acid Synthetase Illustrated by High-Resolution Protein Crystallography.,Matthews MM, McArthur JB, Li Y, Yu H, Chen X, Fisher AJ Biochemistry. 2019 Oct 4. doi: 10.1021/acs.biochem.9b00517. PMID:31583886[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Matthews MM, McArthur JB, Li Y, Yu H, Chen X, Fisher AJ. Catalytic Cycle of Neisseria meningitidis CMP-Sialic Acid Synthetase Illustrated by High-Resolution Protein Crystallography. Biochemistry. 2019 Oct 4. doi: 10.1021/acs.biochem.9b00517. PMID:31583886 doi:http://dx.doi.org/10.1021/acs.biochem.9b00517
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