The digested protein retained similar VEGF-binding activity to that of parental protein, indicating glycosylation is not essential for high affinity binding, which is consistent with the report by Barleon et al [ 36].
Recently, Balasubramanian et al. showed that 3 amino acid residues (S343, P345, and T357) of the M. pneumoniae EF-Tu were essential for its binding activity to fibronectin, and that these critical amino acids are changed to alanine residues in the EF-Tu of M. genitalium[ 47].
Furthermore, except for 5 normal liver tissues with weekly binding activity, TfRscFv-GAL4 fusion protein and the mouse anti-TfR antibody failed to show any binding activity to normal tissues, suggesting that TfRscFv-GAL4 fusion protein was relatively specific to tumor tissues.
Further, only 2 out of the 4 possible VH/VL orientations/arrangements in bDAb construction yielded active products that retain binding activity to both EGFR and IGFR.
Mutations of the Gs at the second and fifth positions reduced their binding activity to less than 10% of that obtained with the wild type sequence.
Furthermore, the supernatant of L. casei transformed with pSCTB YVAD showed strong binding activity to GM1 ganglioside compared with that of pHIL253 (0.78 ± 0.04 vs 0.06 ± 0.01 at OD405, respectively, P < 0.01; Figure 2B).
However, due to the fact that TSP-2 of S. japonicum did not show any binding activity to Ig, it is most likely that the binding is structure-dependent.
sfGFP has proven to be very useful as a scaffold for improved protein detection and tagging both in vivo and in vitro using self-assembled sfGFP fragments [9], [10] and for peptide insertions that confer binding activity to sfGFP giving rise to so-called fluorobodies [11].
Taking together, these data allowed us to assign the H3 binding activity to the MTA1 C-terminal region that is not known for any recognizable structural and functional domain.
