intein (protein intron)-containing protein isolated from Mycobacterium leprae and Mycobacterium tuberculosis; the protein undergoes a protein self-splicing that involves a post-translational excision of the intervening region (intein) which is followed by a peptide ligation; DON NOT confuse with PPS1 protein, Saccharomyces, which is a protein-tyrosine phosphatase; has been sequenced; GenBank U00013
