4-hydroxybenzoyl-5'-AMP + holo-[4-hydroxyphenylalkanoate synthase] = 4-hydroxyphenyl-[4-hydroxyphenylalkanoate synthase] + AMP + H(+)
4-hydroxybenzoyl-5'-amp + holo-[4-hydroxyphenylalkanoate synthase] = 4-hydroxyphenyl-[4-hydroxyphenylalkanoate synthase] + amp + h(+)