5ud5 is a 4 chain structure with sequence from Methanosarcina mazei Go1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
PYLS_METMA Catalyzes the attachment of pyrrolysine to tRNA(Pyl). Pyrrolysine is a lysine derivative encoded by the termination codon UAG (By similarity).