Any feedback?
Please rate this page
(ecexplorer.php)
(0/150)

BRENDA support

EC Explorer

EC 2.3.1.261 Details
EC number
2.3.1.261
Accepted name
(4-hydroxyphenyl)alkanoate synthase
Reaction
(1) 4-hydroxybenzoyl-[(4-hydroxyphenyl)alkanoate synthase] + 8 malonyl-CoA + 16 NADPH + 16 H+ = 17-(4-hydroxyphenyl)heptadecanoyl-[(4-hydroxyphenyl)alkanoate synthase] + 8 CO2 + 8 CoA + 16 NADP+ + 8 H2O;;(2) 4-hydroxybenzoyl-[(4-hydroxyphenyl)alkanoate synthase] + 9 malonyl-CoA + 18 NADPH + 18 H+ + holo-[(4-hydroxyphenyl)alkanoate synthase] = 19-(4-hydroxyphenyl)nonadecanoyl-[(4-hydroxyphenyl)alkanoate synthase] + 9 CO2 + 9 CoA + 18 NADP+ + 9 H2O
Other name(s)
msl7 (gene name), Pks15/1
Systematic name
malonyl-CoA:4-hydroxybenzoyl-[(4-hydroxyphenyl)alkanoate synthase] malonyltransferase [(4-hydroxyphenyl)alkanoate-forming]
Comment
The enzyme is part of the biosynthetic pathway of phenolphthiocerol, a lipid that serves as a virulence factor of pathogenic mycobacteria. It catalyses the elongation of 4-hydroxybenzoate that is loaded on its acyl-carrier domain to form (4-hydroxyphenyl)alkanoate intermediates. The enzyme adds either 8 or 9 malonyl-CoA units, resulting in formation of 17-(4-hydroxyphenyl)heptadecanoate or 19-(4-hydroxyphenyl)nonadecanoate, respectively. As the enzyme lacks a thioesterase domain [1], the product remains loaded on the acyl-carrier domain at the end of catalysis, and has to be hydrolysed by an as-yet unknown mechanism.
History
created 2017
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