3LT6 A TRANSITION FROM STRONG RIGHT-HANDED TO CANONICAL LEFT-HANDED SUPERCOILING IN A CONSERVED COILED COIL SEGMENT OF TRIMERIC AUTOTRANSPORTER ADHESINS - THE MUTANT 4 STRUCTURE CELL ADHESION, YADA, TRIMERIC AUTOTRANSPORTER, CORE RESIDUES, COILED COIL, CELL MEMBRANE, CELL OUTER MEMBRANE, MEMBRANE, PLASMID, VIRULENCE