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EC 2.3.1.287 Details
EC number
2.3.1.287
Accepted name
phthioceranic/hydroxyphthioceranic acid synthase
Reaction
(1) 8 (S)-methylmalonyl-CoA + palmitoyl-[(hydroxy)phthioceranic acid synthase] + 16 NADPH + 16 H+ = 8 CoA + C40-phthioceranyl-[(hydroxy)phthioceranic acid synthase] + 16 NADP+ + 8 CO2 + 8 H2O;;(2) 7 (S)-methylmalonyl-CoA + palmitoyl-[(hydroxy)phthioceranic acid synthase] + 14 NADPH + 14 H+ = 7 CO2 + C37-phthioceranyl-[(hydroxy)phthioceranic acid synthase] + 14 NADP+ + 7 CoA + 7 H2O
Other name(s)
msl2 (gene name), PKS2
Systematic name
(S)-methylmalonyl-CoA:palmitoyl-[(hydroxy)phthioceranic acid synthase] methylmalonyltransferase (phthioceranyl-[(hydroxy)phthioceranic acid synthase]-forming)
Comment
This mycobacterial polyketide enzyme produces the hepta- and octa-methylated fatty acids known as phthioceranic acids, and presumably their hydroxylated versions. Formation of hepta- and octamethylated products depends on whether the enzyme incorporates seven or eight methylmalonyl-CoA extender units, respectively. Formation of hydroxylated products may result from the enzyme skipping the dehydratase (DH) and enoylreductase (ER) domains during the first cycle of condensation [2].
History
created 2019
EC Tree
2.3.1.55 created 1976, deleted 1999
2.3.1.120 created 1990, deleted 1992
2.3.1.124 created 1990, deleted 1992