|
|
| (4 intermediate revisions not shown.) |
| Line 1: |
Line 1: |
| - | ==PGLD-COA COMPLEX: AN ACETYL TRANSFERASE FROM CAMPYLOBACTER JEJUNI== | + | |
| - | <StructureSection load='2vhe' size='340' side='right' caption='[[2vhe]], [[Resolution|resolution]] 1.80Å' scene=''> | + | ==PglD-CoA complex: An acetyl transferase from Campylobacter jejuni== |
| | + | <StructureSection load='2vhe' size='340' side='right'caption='[[2vhe]], [[Resolution|resolution]] 1.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2vhe]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"campylobacter_fetus_subsp._jejuni"_smibert_1974 "campylobacter fetus subsp. jejuni" smibert 1974]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VHE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2VHE FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2vhe]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Campylobacter_jejuni Campylobacter jejuni]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VHE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2VHE FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=COA:COENZYME+A'>COA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 1.8Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3bhp|3bhp]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=COA:COENZYME+A'>COA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/UDP-N-acetylglucosamine_diphosphorylase UDP-N-acetylglucosamine diphosphorylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.23 2.7.7.23] </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=2vhe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2vhe OCA], [https://pdbe.org/2vhe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2vhe RCSB], [https://www.ebi.ac.uk/pdbsum/2vhe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2vhe 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=2vhe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2vhe OCA], [http://pdbe.org/2vhe PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2vhe RCSB], [http://www.ebi.ac.uk/pdbsum/2vhe PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/PGLD_CAMJE PGLD_CAMJE]] Acetyltransferase that modifies the UDP-4-amino-sugar to form UDP-N,N'-diacetylbacillosamine in the N-linked protein glycosylation pathway.<ref>PMID:17087520</ref> <ref>PMID:19448740</ref> | + | [https://www.uniprot.org/uniprot/PGLD_CAMJE PGLD_CAMJE] Acetyltransferase that modifies the UDP-4-amino-sugar to form UDP-N,N'-diacetylbacillosamine in the N-linked protein glycosylation pathway.<ref>PMID:17087520</ref> <ref>PMID:19448740</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| | Check<jmol> | | Check<jmol> |
| | <jmolCheckbox> | | <jmolCheckbox> |
| - | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/vh/2vhe_consurf.spt"</scriptWhenChecked> | + | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/vh/2vhe_consurf.spt"</scriptWhenChecked> |
| | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
| Line 33: |
Line 33: |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Campylobacter fetus subsp. jejuni smibert 1974]] | + | [[Category: Campylobacter jejuni]] |
| - | [[Category: UDP-N-acetylglucosamine diphosphorylase]] | + | [[Category: Large Structures]] |
| - | [[Category: Cygler, M]] | + | [[Category: Cygler M]] |
| - | [[Category: Leclerc, S]] | + | [[Category: Leclerc S]] |
| - | [[Category: Matte, A]] | + | [[Category: Matte A]] |
| - | [[Category: Proteau, A]] | + | [[Category: Proteau A]] |
| - | [[Category: Rangarajan, E S]] | + | [[Category: Rangarajan ES]] |
| - | [[Category: Ruane, K M]] | + | [[Category: Ruane KM]] |
| - | [[Category: Sulea, T]] | + | [[Category: Sulea T]] |
| - | [[Category: Watson, D C]] | + | [[Category: Watson DC]] |
| - | [[Category: Young, N M]] | + | [[Category: Young NM]] |
| - | [[Category: Coenzyme some]]
| + | |
| - | [[Category: N-acetyl transferase]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
PGLD_CAMJE Acetyltransferase that modifies the UDP-4-amino-sugar to form UDP-N,N'-diacetylbacillosamine in the N-linked protein glycosylation pathway.[1] [2]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Campylobacter jejuni is highly unusual among bacteria in forming N-linked glycoproteins. The heptasaccharide produced by its pgl system is attached to protein Asn through its terminal 2,4-diacetamido-2,4,6-trideoxy-d-Glc (QuiNAc4NAc or N,N'-diacetylbacillosamine) moiety. The crucial, last part of this sugar's synthesis is the acetylation of UDP-2-acetamido-4-amino-2,4,6-trideoxy-d-Glc by the enzyme PglD, with acetyl-CoA as a cosubstrate. We have determined the crystal structures of PglD in CoA-bound and unbound forms, refined to 1.8 and 1.75 A resolution, respectively. PglD is a trimer of subunits each comprised of two domains, an N-terminal alpha/beta-domain and a C-terminal left-handed beta-helix. Few structural differences accompany CoA binding, except in the C-terminal region following the beta-helix (residues 189-195), which adopts an extended structure in the unbound form and folds to extend the beta-helix upon binding CoA. Computational molecular docking suggests a different mode of nucleotide-sugar binding with respect to the acetyl-CoA donor, with the molecules arranged in an "L-shape", compared with the "in-line" orientation in related enzymes. Modeling indicates that the oxyanion intermediate would be stabilized by the NH group of Gly143', with His125' the most likely residue to function as a general base, removing H+ from the amino group prior to nucleophilic attack at the carbonyl carbon of acetyl-CoA. Site-specific mutations of active site residues confirmed the importance of His125', Glu124', and Asn118. We conclude that Asn118 exerts its function by stabilizing the intricate hydrogen bonding network within the active site and that Glu124' may function to increase the pKa of the putative general base, His125'.
Structure and Active Site Residues of PglD, an N-Acetyltransferase from the Bacillosamine Synthetic Pathway Required for N-Glycan Synthesis in Campylobacter jejuni(,).,Rangarajan ES, Ruane KM, Sulea T, Watson DC, Proteau A, Leclerc S, Cygler M, Matte A, Young NM Biochemistry. 2008 Feb 19;47(7):1827-1836. Epub 2008 Jan 17. PMID:18198901[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Olivier NB, Chen MM, Behr JR, Imperiali B. In vitro biosynthesis of UDP-N,N'-diacetylbacillosamine by enzymes of the Campylobacter jejuni general protein glycosylation system. Biochemistry. 2006 Nov 14;45(45):13659-69. PMID:17087520 doi:http://dx.doi.org/10.1021/bi061456h
- ↑ Demendi M, Creuzenet C. Cj1123c (PglD), a multifaceted acetyltransferase from Campylobacter jejuni. Biochem Cell Biol. 2009 Jun;87(3):469-83. doi: 10.1139/o09-002. PMID:19448740 doi:http://dx.doi.org/10.1139/o09-002
- ↑ Rangarajan ES, Ruane KM, Sulea T, Watson DC, Proteau A, Leclerc S, Cygler M, Matte A, Young NM. Structure and Active Site Residues of PglD, an N-Acetyltransferase from the Bacillosamine Synthetic Pathway Required for N-Glycan Synthesis in Campylobacter jejuni(,). Biochemistry. 2008 Feb 19;47(7):1827-1836. Epub 2008 Jan 17. PMID:18198901 doi:10.1021/bi702032r
|
