3aag

Crystal structure of C. jejuni pglb C-terminal domain

spinqualitylabelsall models 3aag, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3aag is a 2 chain structure with sequence from Campylobacter jejuni RM1221. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: CA, MLY, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PGLB_CAMJR Oligosaccharyltransferase that catalyzes the transfer of a preassembled heptasaccharide from a lipid donor to an asparagine residue in nascent polypeptide chains, affording a beta-linked glycan to the asparagine side chain of target proteins. 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 Oligosaccharyltransferase (OST) catalyzes the transfer of an oligosaccharide from a lipid donor to an asparagine residue in nascent polypeptide chains. In the bacterium Campylobacter jejuni, a single-subunit membrane protein, PglB, catalyzes N-glycosylation. We report the 2.8 A resolution crystal structure of the C-terminal globular domain of PglB and its comparison with the previously determined structure from the archaeon Pyrococcus AglB. The two distantly related oligosaccharyltransferases share unexpected structural similarity beyond that expected from the sequence comparison. The common architecture of the putative catalytic sites revealed a new catalytic motif in PglB. Site-directed mutagenesis analyses confirmed the contribution of this motif to the catalytic function. Bacterial PglB and archaeal AglB constitute a protein family of the catalytic subunit of OST along with STT3 from eukaryotes. A structure-aided multiple sequence alignment of the STT3/PglB/AglB protein family revealed three types of OST catalytic centers. This novel classification will provide a useful framework for understanding the enzymatic properties of the OST enzymes from Eukarya, Archaea, and Bacteria. Comparative structural biology of eubacterial and archaeal oligosaccharyltransferases.,Maita N, Nyirenda J, Igura M, Kamishikiryo J, Kohda D J Biol Chem. 2010 Feb 12;285(7):4941-50. Epub 2009 Dec 9. PMID:20007322 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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