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Journal of Bacteriology, June 2000, p. 3278-3280, Vol. 182, No. 11
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Natural Diversity in the N Terminus of the
Mature Vacuolating Cytotoxin of Helicobacter pylori
Determines Cytotoxin Activity
D. P.
Letley* and
J. C.
Atherton
Division of Gastroenterology and Institute of
Infections and Immunity, University of Nottingham, Nottingham NG7
2UH, United Kingdom
Received 26 October 1999/Accepted 7 March 2000
Naturally occurring noncytotoxic vacA type s2 strains
of Helicobacter pylori have a 12-residue extension to the
vacuolating cytotoxin (VacA) compared with cytotoxic type s1 strains.
We show that adding the region encoding this extension to type s1
vacA completely abolishes vacuolating cytotoxin activity
but has no effect on VacA production.
*
Corresponding author. Mailing address: Division of
Gastroenterology, Queen's Medical Centre, University Hospital, Clifton Blvd., Nottingham NG7 2UH, United Kingdom. Phone: (44) 115-9249924. Fax: (44) 115-9709923. E-mail:
Darren.Letley{at}nottingham.ac.uk.
Journal of Bacteriology, June 2000, p. 3278-3280, Vol. 182, No. 11
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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