A. XiView images of differential XL-MS data for PR-A vs.
PR-A:SRC3 experiments with crosslinks enriched in apo samples (top) and pre-bound
samples (bottom) represented. HDX overlays are indicative of their comparable
differential HDX-MS experiments. Top: SRC3 exchange - SRC3 vs. PR-A:SRC3 (non-DNA
bound), PR exchange – PR-A vs. PR-A:SRC3. Bottom: SRC3 exchange – SRC3 vs.
PR-A:SRC3:PRE, PR exchange – PR-A:SRC3 vs. PR-A:SRC3:PRE. B. XiView
images of differential XL-MS data for PR-B vs. PR-B:SRC3 experiments with the same HDX
overlays as shown in A. Intraprotein crosslinks are represented in purple,
interprotein crosslinks are represented as green. Differential HDX-MS scale shows the %
change in deuterium incorporation, where cooler colors represent reduced deuterium
exchange, while warmer colors (yellow, orange, red) represent increased deuterium
exchange. Black represents peptides not detected in HDX-MS experiments, and PR isoforms
have numbering normalized to the B isoform.