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    					Antifungal and antibacterial functions of medicinal leech recombinant destabilase-lysozyme and its heated-up derivative  | 
  					 
  					  										
						T. G. YUDINA1, Danyang GUO1( ), N. F. PISKUNKOVA1, I. B. PAVLOVA1, L. L. ZAVALOVA2, I. P. BASKOVA1 | 
					 
															
						| 1. Biological Faculty, M. V. Lomonosov Moscow State University, Moscow 119991, Russia; 2. Institute of Bioorganic Chemistry (RAS) Miklukho-Maklaya 16/10, Moscow 117992, Russia | 
					 
										
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													     		                            						                            																	    Abstract  Antifungal activity of recombinant medicinal leech destabilase-lysozyme (rec.Dest-Lys) was investigated by using fungi: Botrytis cinerea, and Verticillium lateriticum, including yeasts Candida guillermoudii and Shizosaccharomyces pombe. Its antibacterial activity was investigated on gram-negative bacteria Pseudomonas fluorescens. These activities were assessed by radial agar diffusion assay, and scanning and transmission electron microscopy. Therefore, destabilase-lysozyme not only is endo-isopeptidase and lysozyme, but also has antifungal and antibacterial activities. Muramidase activity of rec.Dest-Lys disappeared after heat-treating at 90°C for 50 min without the loss of its antimicrobial activity. Furthermore we showed for the first time that the heated-up derivative of rec.Dest-Lys exhibited more potent activities against the above enumerated fungi and gram-negative bacteria than original protein. 
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															| Keywords 
																																																				recombinant destabilase-lysozyme (rec.Dest-Lys)  
																		  																																				antimicrobial activity  
																		  																																				antifungal activity  
																		  																																				medicinal leech  
																		  																																				heated-up derivative of rec.Dest-Lys (T-rec.Dest-Lys)  
																																			  
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																																Corresponding Author(s):
																GUO Danyang,Email:guody1982@gmail.com   
																													     		
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																																																													Issue Date: 05 June 2012
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