ribosomal-processing cysteine protease Prp and similar proteins
This model represents a family of cysteine proteases that include members found to cleave the N-terminus extension of ribosomal subunit L27 in eubacteria. Proteins in this family are distinguished by a pair of invariant histidine and cysteine residues with conserved spacing that form the classic catalytic dyad of a cysteine protease. Dependence of Staphylococcus aureus on L27 cleavage by Prp makes the enzyme a target for antibiotic development.
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