5-carboxy-1-(5-O-phospho-beta-D-ribofuranosyl)pyridinium-3-carbonyl adenylate + [LarE protein]-L-cysteine = [LarE protein]-S-[5-carboxy-1-(5-O-phosphono-beta-D-ribofuranosyl)pyridinium-3-carbonyl]-L-cysteine + AMP + H(+) — reaction