C-terminal L-cysteinyl-[HypE protein] + carbamoyl adenylate = C-terminal S-carboxamide-L-cysteinyl-[HypE protein] + AMP + H(+)
c-terminal l-cysteinyl-[hype protein] + carbamoyl adenylate = c-terminal s-carboxamide-l-cysteinyl-[hype protein] + amp + h(+)