Phenolpthiocerol synthesis type-I polyketide synthase PpsC; Involved in the elongation of either C22-24 fatty acids by the addition of malonyl-CoA and methylmalonyl-CoA extender units to yield phthiocerol derivatives.

Polyketide synthase Pks13; Rv3800c, (MTV026.05c), len: 1733 aa. Probable pks13,polyketide synthase, equivalent to Q9CDB1|PKS13|ML0101 polyketide synthase from Mycobacterium leprae (1784 aa),FASTA scores: opt: 7454, E(): 0, (83.6% identity in 1748 aa overlap); and similar to Q9Z5K6|ML2357|MLCB12.02c putative polyketide synthase from Mycobacterium leprae (1871 aa),FASTA scores: opt: 1682, E(): 1.2e-85, (38.3% identity in 1096 aa overlap). Also similar in part to many e.g. Q9ADL6|SORA soraphen polyketide synthase a from Polyangium cellulosum (6315 aa) FASTA scores: opt: 1422, E(): 1e-70,( [...]

Rv2940c, (MTCY24G1.09, MTCY19H9.08c), len: 2111 aa. Probable mas, mycocerosic acid synthase membrane associated, multifunctional enzyme (see citations below),almost identical to Q02251|MCAS_MYCBO|mas mycocerosic acid synthase from Mycobacterium bovis (2110 aa), FASTA scores: opt: 13226, E(): 0, (95.8% identity in 2115 aa overlap) (see Mathur & Kolattukudy 1992); and equivalent to Q9CD78|mas|ML0139 putative mycocerosic synthase from Mycobacterium leprae (2116 aa), FASTA scores: opt: 12142,E(): 0, (87.95% identity in 2119 aa overlap); and Q49624|PKS3|MASA|ML1229|B1170_C2_209 probable myc [...]

Polyketide synthase Pks12; Rv2048c, (MTV018.35c), len: 4151 aa. Pks12,polyketide synthase similar to many. Contains 2x PS00012 Phosphopantetheine attachment site, 2x PS00606 Beta-ketoacyl synthases active site, and PS00343 Gram-positive cocci surface proteins 'anchoring' hexapeptide. Nucleotide position 2297976 in the genome sequence has been corrected, G:A resulting in S3004L.

Polyketide synthase Pks2; Catalyzes the synthesis of the hepta- and octamethyl phthioceranic acids and/or hydroxyphthioceranic acids that are the major acyl constituents of sulfolipids.

Probable polyketide synthase Pks1; May play a role in phthiocerol biosynthesis.

Rv1661, (MTCY06H11.26), len: 2126 aa. Probable pks7,polyketide synthase, similar to many e.g. ERY2_SACER|Q03132 erythronolide synthase, modules 3 and 4 (3567 aa), FASTA scores: E(): 0, (48.8% identity in 2131 aa overlap); also similar to Mycobacterium tuberculosis pks12. Contains PS00606 Beta-ketoacyl synthases active site, PS00012 Phosphopantetheine attachment site.

Phenyloxazoline synthase MbtB (phenyloxazoline synthetase); Involved in the initial steps of the mycobactin biosynthetic pathway. Putatively couples activated salicylic acid with serine or threonine and cyclizes this precursor to the hydroxyphenyloxazoline ring system present in this class of siderophores. Essential for growth in macrophages; Belongs to the ATP-dependent AMP-binding enzyme family. MbtB subfamily.

Probable polyketide beta-ketoacyl synthase Pks4; Polyketide synthase involved in the biosynthesis of methyl- branched fatty acids such as mycolipanoic, mycolipenic (phthienoic) and mycolipodienoic acids required for the synthesis of a major class of polyacylated trehaloses. Catalyzes the elongation of CoA esters of long-chain fatty acids by incorporation of three methylmalonyl (but not malonyl) residues, to form trimethyl-branched fatty-acids.