4-hydroxybutanoate + ATP + CoA <=> 4-hydroxybutanoyl-CoA + AMP + diphosphate
4-hydroxybutanoate + atp + coa <=> 4-hydroxybutanoyl-coa + amp + diphosphate
4-hydroxybutanoate + ATP + CoA <=> 4-hydroxybutanoyl-CoA + AMP + diphosphate
4-hydroxybutanoate + atp + coa <=> 4-hydroxybutanoyl-coa + amp + diphosphate