An anti-lipopolysaccharide factor from red swamp crayfish, Procambarus clarkii, exhibited antimicrobial activities in vitro and in vivo

作者：Sun Chen; Xu Wen Teng; Zhang Hong Wei; Dong Li Ping; Zhang Ting; Zhao Xiao Fan; Wang Jin Xing^*

来源：Fish & Shellfish Immunology, 2011, 30(1): 295-303.

DOI：10.1016/j.fsi.2010.10.022

• Anti-lipopolysaccharide factor
• ALF
• Procambarus clarkii
• Microorganism-binding activity
• Polysaccharide-binding activity
• Antimicrobial activity

The anti-lipopolysaccharide factors (ALFs) are a group of effector molecules of innate immunity in arthropods, exhibiting binding and neutralizing activities to lipopolysaccharides. In this study, an ALF cDNA sequence (PcALF1) was identified from red swamp crayfish, Procambarus clarkii. The deduced peptide of PcALF1 was conserved; it manifested the signal peptide and lipopolysaccharide (LPS)-binding domain, especially the two conserved cysteine residues at both ends of the domain. Transcripts of PcALF1 were detected in multiple tissues. Results of quantitative real-time PCR exhibited that the expression level of PcALF1 was induced by virus and Gram-positive and Gram-negative bacteria. Purified recombinant protein of PcALF1 revealed multiple biological activities: it gave all the tested bacteria and fungi a tight binding; it could bind microbial polysaccharides (LPS, LTA, and beta-glucan) as well. In vitro, the antimicrobial activity assay was demonstrated as a broad spectrum against Gram-positive and Gram-negative bacteria and a fungus.

• 出版日期2011-1
• 单位山东大学