Abstract: The invention discloses a method of manufacturing a lysin protein capable of directly lysing Acinetobacter baumannii without pretreatment processing using chloroform or EDTA, comprising: transforming an expression plasmid into E. coli, wherein the expression plasmid is deposited at DSMA-Deutsche Sammlung von Mikroorganismen and Zellkulturen with deposit number DSM32023; expressing the expressing plasmid by the E. coli to form lysin protein having an amino acid sequence as set forth in SEQ ID NO: 6; lysing the E. coli containing the lysing protein to obtain a supernatant by centrifugating the E. coli lysate; mixing the supernatant and Ni2+ resins, washing the unbound protein by a binding buffer containing 50 mM Tris-HCl (pH 8.2), 15 mM MgCl2, 20% (v/v) glycerol, 0.05% ?-ME and 0.1 mM PMSF; and eluting the purified lysing protein by an elution buffer containing 50 mM Tris-HCl (pH 8.2), 15 mM MgCl2, 20% (v/v) glycerol, 0.05% ?-ME, 0.1 mM PMSF and 250 mM imidazole.

Abstract: The invention discloses a purified lysin protein for lysing Acinetobacter baumannii cells without pretreatment process using chloroform or EDTA. The purified lysin protein includes a first peptide fragment and a second peptide fragment. The first peptide fragment has an amino acid sequence set forth as SEQ ID NO: 4 and the second peptide fragment has a amino acid sequence set forth as SEQ ID NO: 5.