7jhk

From Proteopedia

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Current revision

Structure of human beta 1,3-N-acetylglucosaminyltransferase 2 in unliganded form

Structural highlights

Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.3436Å
Ligands:	, , , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Publication Abstract from PubMed

beta1,3-N-acetylglucosaminyltransferases (B3GNTs) are Golgi-resident glycosyltransferases involved in the biosynthesis of poly-N-acetyl-lactosamine chains. They catalyze the addition of the N-acetylglucosamine to the N-acetyl-lactosamine repeat as a key step of the chain elongation process. Poly-N-acetyl-lactosamine is involved in immune system in many ways. Particularly, its long chain has been demonstrated to suppress excessive immune responses. Among the characterized B3GNTs, B3GNT2 is the major poly-N-acetyl-lactosamine synthase and deletion of its coding gene dramatically reduced the cell surface poly-N-acetyl-lactosamine and led to hypersensitive and hyperresponsive immunocytes. Despite the extensive functional studies, no structural information is available to understand the molecular mechanism of B3GNT2, as well as other B3GNTs. Here we present the structural and kinetic studies of the human B3GNT2. Five crystal structures of B3GNT2 have been determined in the unliganded, donor substrate-bound, acceptor substrate-bound and product(s)-bound states at resolutions ranging from 1.85 A to 2.35 A. Kinetic study shows that the transglycosylation reaction follows a sequential mechanism. Critical residues involved in recognition of both donor and acceptor substrates as well as catalysis are identified. Mutations of these invariant residues impair B3GNT2 activity in cell assays. Structural comparison with other glycosyltransferases such as mouse Fringe reveals a novel N-terminal helical domain of B3GNTs that may stabilize the catalytic domain and distinguish among different acceptor substrates.

Structures and mechanism of human glycosyltransferase beta1,3-N-acetylglucosaminyltransferase 2 (B3GNT2), an important player in immune homeostasis.,Hao Y, Crequer-Grandhomme A, Javier N, Singh A, Chen H, Manzanillo P, Lo MC, Huang X J Biol Chem. 2020 Nov 6. pii: RA120.015306. doi: 10.1074/jbc.RA120.015306. PMID:33158990^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Hao Y, Crequer-Grandhomme A, Javier N, Singh A, Chen H, Manzanillo P, Lo MC, Huang X. Structures and mechanism of human glycosyltransferase beta1,3-N-acetylglucosaminyltransferase 2 (B3GNT2), an important player in immune homeostasis. J Biol Chem. 2020 Nov 6. pii: RA120.015306. doi: 10.1074/jbc.RA120.015306. PMID:33158990 doi:http://dx.doi.org/10.1074/jbc.RA120.015306

1 Structural highlights
2 Publication Abstract from PubMed
3 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/7jhk"

Categories: Large Structures | Hao Y | Huang X

@@ Line 3: / Line 3: @@
 <StructureSection load='7jhk' size='340' side='right'caption='[[7jhk]], [[Resolution|resolution]] 2.34&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[7jhk]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7JHK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7JHK FirstGlance]. <br>
+<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7JHK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7JHK FirstGlance]. <br>
 </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3436&#8491;</td></tr>
 <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=7jhk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7jhk OCA], [https://pdbe.org/7jhk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7jhk RCSB], [https://www.ebi.ac.uk/pdbsum/7jhk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7jhk ProSAT]</span></td></tr>
 </table>
-== Function ==
-[https://www.uniprot.org/uniprot/B3GN2_HUMAN B3GN2_HUMAN] Beta-1,3-N-acetylglucosaminyltransferase involved in the synthesis of poly-N-acetyllactosamine. Catalyzes the initiation and elongation of poly-N-acetyllactosamine chains. Shows a marked preference for Gal(beta1-4)Glc(NAc)-based acceptors (PubMed:9892646). Probably constitutes the main polylactosamine synthase.<ref>PMID:11042166</ref> <ref>PMID:25279697</ref> <ref>PMID:9892646</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 23: / Line 21: @@
 __TOC__
 </StructureSection>
-[[Category: Homo sapiens]]
 [[Category: Large Structures]]
 [[Category: Hao Y]]
 [[Category: Huang X]]

7jhk

From Proteopedia

Current revision

Structure of human beta 1,3-N-acetylglucosaminyltransferase 2 in unliganded form

Structural highlights

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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