... further the role of the IC in the catalysis of ABC transporters, we created, in Abcb1a, six single-site mutants (E552D, N and A, and E1197D, N and A,) and three double-mutants (E552Q ⁄ E1197Q, E552Q ... advantage of the trypsin-sensitive region situated in the linker domain of Abcb1a Following trapping in the absence or presence of Vi and mild-trypsin treatment, the trypsin degradation products of the ... on the nucleotide-binding affinity of the protein [24,39,43] In addition, this confirms the notion that residues E552 and E1197 seem to participate in the catalytic steps after the initial binding...