title: Functional analysis of two invertebrate-type lysozymes from red swamp crayfish, Procambarus clarkii.
abstract: Lysozyme is an important immune effector and is widely distributed in many organisms. In the present study, two novel invertebrate-type lysozymes (Pclysi1 and Pclysi2) were cloned from red swamp crayfish, Procambarus clarkii. Alignment analysis showed that these two genes were different in catalytic residues. Results of RT-PCR showed that these two genes share similar tissue distribution patterns, and both were upregulated after bacteria challenge. The mature recombinant proteins were expressed in Escherichia coli system and purified. Activity analysis revealed that rPclysi1 had no muramidase activity and isopeptidase activity, but had antimicrobial activity. Meanwhile, rPclysi2 was muramidase-deficient and had no antimicrobial activity, but possessed isopeptidase activity. Above data suggest that Pclysi1 and 2 may offer different functions in the crayfish immunity.
authors.affiliation: School of Life Sciences, The Key Laboratory of Plant Cell Engineering and Germplasm Innovation of Ministry of Education, Shandong University, Jinan, Shandong, China.
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Zhang
authors.forename: Chen
authors.initials: C
authors.lastname: Sun
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Sun
authors.forename: Xiao-Fan
authors.initials: XF
authors.lastname: Zhao
authors.forename: Jin-Xing
authors.initials: JX
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003400:Astacoidea / Q000201:enzymology* / Q000235:genetics / Q000276:immunology; D001483:Base Sequence; D019759:Carbon-Nitrogen Lyases / Q000378:metabolism; D003001:Cloning, Molecular; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D009113:Muramidase / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D010802:Phylogeny; D012313:RNA / Q000737:chemistry / Q000235:genetics; D011994:Recombinant Proteins / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment
chemical_list: D011994:Recombinant Proteins; D012313:RNA; D009113:Muramidase; D019759:Carbon-Nitrogen Lyases; C034300:isopeptidase