Fig. 2.
Structure and low-energy collision-induced dissociation spectrum of the cross-linked species with a m/z value of 891.467+ from E. coli complex. (Inset) The MS spectrum of this species. (Lower) Structure indicates the residue numbers of the cross-linked sites. C-terminal sequence ions that did not contain the cross-linker moiety are labeled in lowercase, e.g., yi# (red), y′i (brown), and yi (blue) ions. N-terminal sequence ions of FtsY K406–K447 that contained cross-linked FtsY K399–R402 peptide moiety are annotated as Bi (green). C-terminal sequence ions of FtsY K406–K447 that contained the cross-linked Ffh M1–R8 peptide moiety are annotated as Yi (magenta).