label: E-Y cross-linked-[PQQ precursor protein] + 5'-deoxyadenosine + L-methionine + H(+) => [PQQ precursor protein] + S-adenosyl-L-methionine
label_lc: e-y cross-linked-[pqq precursor protein] + 5'-deoxyadenosine + l-methionine + h(+) => [pqq precursor protein] + s-adenosyl-l-methionine