Related Experiment Video
Updated: Jun 9, 2026

Identification of Hemolytic and Phospholipase Activity in Crude Extracts from Sea Anemones by Straightforward Bioassays
Published on: March 29, 2022
Functional analysis of two invertebrate-type lysozymes from red swamp crayfish, Procambarus clarkii
Hong-Wei Zhang1, Chen Sun, Shan-Shan Sun
1School of Life Sciences, The Key Laboratory of Plant Cell Engineering and Germplasm Innovation of Ministry of Education, Shandong University, Jinan, Shandong, China.
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.
Related Concept Videos
Lysosomal Hydrolases
Lysosomes
Overview of Myosin Structure and Function

