The specificity of binding of anti-GAD was measured for selected sera by competitive binding experiments in which a 100-fold excess of unlabeled GAD65 or GAD67 (8×10−9 M) was added to the standard RIP containing 125I labeled GAD65 or GAD67.
We note that in those SEC binding experiments in vitro in which we used isolated BubR1 rather than BubR1/Bub3, Bub3 might have exchanged from the Bub1/Bub3 complex to reconstitute BubR1/Bub3.
In a ternary complex formation assay, the apparent dissociation constant (Kd,app) for dADP was greater than 100 µM (Fig. 3B); by contrast, a similar experiment in which binding of dATP was measured demonstrated a Kd,app of approximately 9.2 µM [5].
This was further supported by an experiment in which the binding buffer and gradient contained a high concentration of salt (0.5 M NaCl, Figure 2C).
This was investigated by an immunostaining experiment in which the binding of SHe-specific IgG antibodies present in SHe-KLH immune serum to the surface of HRSV A2-infected A549 cells was compared to binding to HRSV A2 virions attached to the surface of A549 cells at 4°C.
To better define the importance of the carbamoyl group for cellular recognition, binding, and internalization, we conducted an experiment in which four cancer cell lines were treated with 25 μM decarbamoyl BLM monosaccharide Cy5** (2) or BLM monosaccharide Cy5** (1) conjugate and then fixed with 4% paraformaldehyde.
The opposite experiment in which the Grb2 binding sites in Gab1 were mutated also resulted in an impaired tyrosine phosphorylation of Gab1 [ 46, 59, 61, 62].
The latter finding was confirmed by performing a C/EBP- β overexpression experiment in which NF κB binding, proinflammatory cytokine gene expression, and JNK activation were indeed increased [ 99].
To determine a binding constant specific for Ca2+, we next performed a competition experiment in which the solution of Tb3+ and SbpA from the previous experiment was titrated with increasing concentrations of Ca2+ to compete for the binding sites.
This speculation is also supported by the results from our control experiment, in which excess CIDR reduces but not eliminate the binding between CD36 and IRBCs.
