Tight junction modulation and biochemical characterisation of the zonula occludens toxin C-and N-termini

E. Prasad, S. M. Kelly, C. F. Van Der Walle

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The ZOT N-terminal domain was expressed and refolded, yielding a soluble protein with defined secondary structure. Although distantly related to protein I of filamentous phages, no evidence of ATPase activity was found. It is therefore unlikely that the ZOT N-terminal domain is involved in cholera toxin phage packaging in Vibrio cholerae. The ZOT C-terminal domain caused delocalisation of occludin and ZO-1 from Caco-2 cell–cell contacts, irrespective of disulfide bridge formation in its putative binding domain. However, the C-terminal domain did not cause actin reorganisation and this may explain the absence of a concomitant reduction in the transepithelial electrical resistance across cell monolayers.
Original languageEnglish
Pages (from-to)2974-2980
Number of pages6
JournalFEBS Letters
Issue number16
Publication statusPublished - 29 May 2007


  • tight junction
  • zonula occludens toxin
  • ATPase

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