passages.id: split_8_test_2597_passage
passages.type: progene_text
passages.text: Cysteine desulfurase is a pyridoxal 5'-phosphate ( PLP ) - dependent homodimeric enzyme that catalyzes the conversion of L-cysteine to L-alanine and sulfane sulfur via the formation of a protein - bound cysteine persulfide intermediate on a conserved cysteine residue .