Fig. 2.
Identification of ubiquitin peptides by mass spectrometry. (A) HPLC purification of the fraction containing mycobactericidal compound. The bactericidal activity of the total (T) sample was compared with that of the buffer-treated control (C) and each fraction from SF and SF*. The arrow on the trace indicates the peak retaining bactericidal activity. (B) Amino acid sequence of ubiquitin as an N-terminal extension of ribosomal subunit Rps27A. Amino acids corresponding to the ubiquitin are in bold. The peptides identified by mass spectroscopy are underlined in blue, and the peptides Ub1 and Ub2 are overlined in green.