Lin SW, Yuan TM, Li JR, Lin CH Carboxyl Terminus of Helicobacter pylori a1,3-Fucosyltransferase Determines the Structure and Stability Biochemistry45(26) (2006)
8108-8116
The structure was elucidated in this paper NCBI PubMed ID:16800635 Publication DOI:10.1021/bi0601297 Journal NLM ID:0370623 Publisher: American Chemical Society Correspondence: chunhunggate.sinica.edu.tw Institutions: Institute of Biological Chemistry and Genomics Research Center, Academia Sinica, No. 128 Academia Road Section 2, Nan-Kang, Taipei 11529, Taiwan, and Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taipei 10617, Taiwan, Institute of Biological Chemistry and Genomics Research Center, Academia Sinica, No. 128 Academia Road Section 2, Nan-Kang, Taipei 11529, Taiwan, Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
Helicobacter pylori is well known as the primary cause of gastritis, duodenal ulcers, and gastric cancer. The pathogenic bacteria produces Lewis x and Lewis y epitopes in the O-antigens of lipopolysaccharides to mimic the carbohydrate antigens of gastric epithelial cells to avoid detection by the host's immune system. The enzyme α1,3-fucosyltransferase from H. pylori catalyzes the glycosyl addition of fucose from the donor GDP-fucose to the acceptor N-acetyllactosamine. The poor solubility of the enzyme was resolved by systematic deletion of the C-terminus. We report here the first structural analysis using CD spectroscopy and analytical ultracentrifugation. The results indicate that up to 80 residues, including the tail rich in hydrophobic and positively charged residues (sequence 434-478) and 5 of the 10 tandem repeats of 7 amino acids each (399-433), can be removed without significant change in structure and catalysis. Half of the heptad repeats are required to maintain both the secondary and native quaternary structures. Removal of more residues in the C-terminus led to major structural alteration, which was correlated with the loss of enzymatic activity. In accordance with the thermal denaturation studies, the results support the idea that a higher number of tandem repeats functioning to facilitate a dimeric structure helps to prevent the protein from unfolding during incubation at higher temperatures.
Lipopolysaccharide, structure, O-antigen, epitope, Helicobacter pylori, fucose, Lewis x, Lewis y, a1, 3-Fucosyltransferase
Methods: biochemical methods Enzymes that release or process the structure: fucosyltransferase Biosynthesis and genetic data: genetic data, biochemical data Comments, role: substrate for fucosyltransferase
Related record ID(s): 1745, 20052, 20336, 20337, 20338, 20339, 20341, 20427, 20430 NCBI Taxonomy refs (TaxIDs):210 Reference(s) to other database(s): GTC:G79160ZM, GlycomeDB:1428 Show glycosyltransferases
There are 3 chemically distinct structures. Please, select:
Found 
report error
gate.sinica.edu.tw