holo-[4-hydroxyphenylalkanoate synthase] + 4-hydroxybenzoate + ATP <=> 4-hydroxyphenyl-[4-hydroxyphenylalkanoate synthase] + AMP + diphosphate
holo-[4-hydroxyphenylalkanoate synthase] + 4-hydroxybenzoate + atp <=> 4-hydroxyphenyl-[4-hydroxyphenylalkanoate synthase] + amp + diphosphate