FIGURE 2.

A single protein, MspA, with two imperfect repeats makes up the Methanospirillum. (A) Disassembly of the purified sheaths followed by SDS–PAGE and mass spectrometry analysis led to the identification of the hypothetical protein WP_011449234.1, now referred to as MspA. The signal peptide residues are colored red while the two imperfect repeats, identified with the online tool RADAR (Andreas and Liisa, 2000), are colored blue. (B) Alignment of the two imperfect repeats. Conserved residues are colored yellow while residues with similar properties are shown in green (small and/or hydrophobic) or blue (polar + Gly).