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• W2022082839 abstract "The C-terminal fragment of Clostridium perfringens enterotoxin (C-CPE) modulates the barrier function of claudin-4 via its C-terminal 16 amino acids. In the current study, we investigated the roles of tyrosine residues (Y306, Y310 and Y312) in this region in the modulation of TJs by C-CPE. Single mutations of Y306, Y310 and Y312 to alanine resulted in partial reduction of claudin-4 binding. We also prepared double mutants of C-CPE to further evaluate the roles of these tyrosine residues. Replacement of Y310 and Y312 with alanine (Y310A/Y312A) partly reduced the ability of C-CPE to bind to claudin-4. Double mutants Y306A/Y310A and Y306A/Y312A, however, lost the ability to bind to claudin-4 and to modulate the TJ barrier. We also found that a triple mutant (Y306A/Y310A/Y312A) lost the ability to bind claudin-4, modulate the TJ barrier, and enhance jejunal absorption in rats. These results indicate that tyrosines 306, 310, and 312 are critical for the interaction of C-CPE with claudin-4 and for the modulation of TJ barrier function by C-CPE. This study provides information that should help in the development of claudin modulators based on C-CPE." @default.
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• W2022082839 date "2007-01-01" @default.
• W2022082839 modified "2023-09-27" @default.
• W2022082839 title "Role of tyrosine residues in modulation of claudin-4 by the C-terminal fragment of Clostridium perfringens enterotoxin" @default.
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• W2022082839 doi "https://doi.org/10.1016/j.bcp.2006.10.002" @default.
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