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Mol Immunol. 2007 Feb;44(6):1085-94. Epub 2006 Aug 22.

Molecular cloning and characterization of a lipopolysaccharide and beta-1,3-glucan binding protein from fleshy prawn (Fenneropenaeus chinensis).

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School of Life Sciences, Shandong University, Jinan, Shandong 250100, China.


Pattern recognition proteins (PRPs), such as lipopolysaccharide and beta-1,3-glucan binding protein (LGBP), have been identified in many animals and play a crucial role in invertebrate defense systems. In the current study, an LGBP gene was cloned from fleshy prawn (Fenneropenaeus chinensis, Fc-LGBP) utilizing homology cloning and RACE methods. The full cDNA of the Fc-LGBP gene in fleshy prawn was 1253bp in size with a deduced 366 amino acid protein that includes a glycosyl hydrolase domain. Northern blot and RT-PCR data suggested that Fc-LGBP mRNA was mostly synthesized in haemocytes and that the expression was down-regulated 24h post-injection of bacteria. In situ hybridization demonstrated that Fc-LGBP mRNA was only detected in haemocyte cytoplasm, with no detection in other tissues. The molecular weight of the purified recombinantly expressed Fc-LGBP was approximately 46kDa. Immunohistochemistry of haemocytes revealed that Fc-LGBP protein was localized on the membrane of most cells. Data from bacterial binding assays utilizing purified protein suggested that rFc-LGBP had strong binding activity to Gram-negative bacteria.

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