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Epitope for antibodies inhibiting H. pylori urease characterized.

Vaccine Weekly

| July 07, 2004 | COPYRIGHT 2004 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2004 JUL 7 - (NewsRx.com & NewsRx.net) -- Scientists have characterized the epitope for monoclonal antibodies inhibiting enzymatic activity of Helicobacter pylori urease.

"Two characteristic monoclonal antibodies (HpU-2 and -18) out of 26 monoclonal antibodies (HpU-1 (approx)26) produced against Helicobacter pylori urease showed a strong inhibitory effect against the enzymatic activity of the urease. Epitope mapping about some monoclonal antibodies of the HpU-series inhibiting enzymatic activity was performed by using a surface plasmon resonance apparatus and by digesting H. pylori urease with trypsin, followed by mass spectroscopy," researchers in Japan report.

"The sequences of the epitopes recognized by HpU-2 and -18 were SVELIDIGGNRRIFGFNALVDR (22 mer) and IFGFNALVDR (10 mer), respectively," stated Ryoji Fujii and collaborators at Hiroshima Prefectural University and Fukuyama Medical Laboratory Company. "The former sequence is present as a part of a loop structure at a position close to the C-terminal of the alpha-subunit of H. pylori urease, although it has been suggested that the active site of the urease resides in the beta-subunit."

"The above peptide (22 mer) was chemically synthesized in a linear and cyclic form, and its conjugate with BSA was ...

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