ID 6.2.1.56 DE 4-hydroxybutyrate--CoA ligase (ADP-forming). CA 4-hydroxybutanoate + ATP + CoA = 4-hydroxybutanoyl-CoA + ADP + phosphate. CC -!- The enzyme, characterized from the marine ammonia-oxidizing archaeon CC Nitrosopumilus maritimus, participates in a variant of the CC 3-hydroxypropanoate/4-hydroxybutanate CO2 fixation cycle. cf. CC EC 6.2.1.40. DR A9A1Y1, HBCAL_NITMS; //