Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/35311
Title: RECOMBINANT PROTEINS AND PEPTIDES FOR ENDOTOXIN BIOSENSORS, ENDOTOXIN REMOVAL, AND ANTI-MICROBIAL AND ANTI-ENDOTOXIN THERAPEUTICS
Authors: DING, JEAK LING 
HO, BOW 
TAN, NGUAN SOON 
Issue Date: 19-Apr-2001
Source: DING, JEAK LING,HO, BOW,TAN, NGUAN SOON (2001-04-19). RECOMBINANT PROTEINS AND PEPTIDES FOR ENDOTOXIN BIOSENSORS, ENDOTOXIN REMOVAL, AND ANTI-MICROBIAL AND ANTI-ENDOTOXIN THERAPEUTICS. ScholarBank@NUS Repository.
Abstract: Recombinant fragments of Factor C are disclosed. These proteins and peptides show great potency in recognizing, binding to, neutralising, and removing endotoxin. These molecules can thus be used for anti-microbial, anti-endotoxin, and anti-sepsis therapy. SSCrFCES is a 38 kDa protein representing the LPS-binding domain of Factor C. The ability of SSCrFCES to bind lipid A was analyzed using an ELISA-based assay as well as surface plasmon resonance. Surface plasmon resonance similarly carried out for SSCrFC-sushi-1,2,3-GFP, SSCrFC-sushi-1GFP, and SSCrFC-sushi-3GFP confirmed their superior affinity for endotoxin. The 50 % endotoxin-neutralizing concentration of SSCrFCES against 200 EU of endotoxin is 0.069 'mu'M, suggesting that SSCrFCES is an effective inhibitor of LAL coagulation cascade. Although partially attenuated by human serum, as low as 1 'mu'M of SSCrFCES inhibits the LPS-induced secretion of hTNF-'alpha' and hIL-8 THP-1 and human peripheral blood mononuclear cells with a potency more superior than polymyxin B. SSCrFCES is non-cytotoxic, with a clearance rate of 4.7 ml/minute. The LD¨90 of SSCrFCES for LPS lethality in mice is achieved at 2 'mu'M. These results demonstrate the endotoxin-neutralizing capability of SSCrFCES <i>in vitro</i> and <i>in vivo</i>, as well as its potential for use in the treatment of endotoxin-induced septic shock. Also embodied in this application is the use of the sushi peptides and their mutant derivatives as potent antimicrobials. Further embodied in this application is the use of sushi peptides or sushi recombinant proteins to remove endotoxin from liquids.
URI: http://scholarbank.nus.edu.sg/handle/10635/35311
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