The schematic gene map of the GPL biosynthetic cluster in M. smegmatis [6,13]. The sequence of MSMEG_0400–0402 was determined (GenBank accession no. AB924538). Two open reading frames, mps1 and mps2, were encoded in this segment. The Mps1 of the J15cs strain was 6 consecutive amino acids shorter compared to that of the mc2155 strain, whereas the Mps2 of the J15cs strain was identical to that of the mc2155 strain.