Binding of beads coated with mADAM 3
disintegrin domains: role of the disintegrin loop.
Fluorescent beads were coated with mADAM 3 disintegrin domains
prepared, as indicated, in either Drosophila cells (D-ADAM 3) or
E. coli (E-ADAM 3) and then processed for binding to
zona-free murine eggs as described in MATERIALS AND METHODS. (A). Eggs
were preincubated for 30 min at 37°C with either a scrambled (scr.)
or an authentic (loop) mADAM 3 disintegrin loop peptide at a
final concentration of 1 mM peptide. (B) Beads were coated as indicated
with either wild-type or the D6A/Q7A mADAM 3 disintegrin domain
and then processed for binding to eggs. (C) Eggs were preincubated for
30 min at 37°C with, as indicated, either the D6A/Q7A mutant (mut.)
or the wild-type (wt) mADAM 3 disintegrin domain (20 μM), and
then processed for binding of beads coated with wt-mADAM 3
disintegrin domain.