Cloning of Clostridium difficile toxin B gene and demonstration of high N-terminal homology between toxin A and B.

Abstract:

:High titered Clostridium sordellii lethal toxin antiserum, cross-reactive with C. difficile cytotoxin B (ToxB), was used to isolate toxB fragments from a C. difficile expression library. Recombinant clones containing toxB fragments of the 5' and 3' end were isolate. A 2.5-kb HincII fragment of chromosomal DNA overlaps both groups of clones. A partial restriction map of the total toxB gene is presented. The gene is positioned upstream of utxA and toxA, toxB has a size of 6.9 kb, corresponding to a 250-kDa polypeptide. A partial sequence of the 5' end of toxB was determined. The sequence contains 398 bp upstream of toxB with a putative Shine-Dalgarno box (AGGAGA) and 609 bp of the toxB open reading frame. The N-terminal 203 amino acids of ToxB were compared with the N-terminal amino acids of the enterotoxin A (ToxA). A homology of 64% of the residues was detected, which proves the relatedness of ToxA and ToxB of C. difficile.

journal_name

Med Microbiol Immunol

authors

von Eichel-Streiber C,Laufenberg-Feldmann R,Sartingen S,Schulze J,Sauerborn M

doi

10.1007/BF00192465

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

271-9

issue

5

eissn

0300-8584

issn

1432-1831

journal_volume

179

pub_type

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