FIG. 2.

Protein alignment of the putative maturase, Smtr, in SCH909 with eubacterial group II intron-encoded proteins from an Acinetobacter sp. (Acin.sp.) (J. H. Yum et al., unpublished; GenBank accession number AF369871; ORF II), N. europaea (N. euro) (JGI, unpublished), P. alcaligenes (PaOrX6) (36), Streptococcus pneumoniae (S. pneu) (5), and Lactococcus lactis (LlltrA) (18). Consensus amino acids (four or more identical in the six sequences) are in bold letters. Domains conserved among intron-encoded proteins are denoted by the lines above the alignment. RT1 through RT7, RT-like domains (19); z, domain of undetermined function in non-long terminal repeat retroelements; x, maturase-specific domain (19). Numbers in parentheses indicate numbers of amino acids not shown.