项目名称: 基于量子点无损标记及多光谱成像的食源性大肠杆菌生物膜形成和发展分子机理研究
项目编号: No.31471658
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 农业科学
项目作者: 韩四海
作者单位: 河南科技大学
项目金额: 86万元
中文摘要: 在食品工业中,造成食品微生物污染的一个重要原因是细菌生物膜的形成。大肠杆菌是重要的食源性致病菌。在大肠杆菌生物膜形成和发展过程中,Ag43、TibA、AatB等蛋白分子扮演关键的角色。对生物膜分子结构进行无损标记和动态变化观察是重大技术瓶颈,人们对食源性大肠杆菌生物膜形成分子机理认识仍十分有限。本研究利用表面修饰的量子点对食源性大肠杆菌细菌生物膜分子结构进行靶向性无损标记,利用多光谱分子成像、激光共聚焦显微镜(LSCFM)分析、扫描电镜(SEM)分析、傅里叶变换红外光谱分析(FTIR),对生物膜动态变化过程(包括Ag43、TibA、AatB空间分布、相互作用方式)进行研究,建立量子点动态多靶点标记方法,探明食源性大肠杆菌生物膜结构体系形成的分子机理。该项目研究,不仅有助于解决食品行业细菌生物膜污染这一重大食品卫生安全问题,也为研究其他细菌生物膜形成和发展提供新的技术方法和科学理论支持。
中文关键词: 量子点;食源性;大肠杆菌;生物膜
英文摘要: In food industry,the most important cause of food pathogens contamination is the formation of bacterial biofilms. Escherichia coli are important foodborne pathogens. The autotransporter (AT) proteins Ag43、TibA、AatB appeared to play a critical role in Escherichia coli,E. coli biofilm formation and development. Noninvasive labeling and observation on the dynamic changes of bacterial biofilms molecular architecture is major technological bottleneck of current research on biofilms,and understanding of the molecular mechanisms of foodborne Escherichia coli biofilms architecture formation is still very limited.In this work, the molecular architecture of foodborne Escherichia coli biofilms are noninvasively multi-targeted labeled with surface-engineered quantum dots.The molecular architecture dynamic changes including spatial distribution and interaction of Ag43、TibA、AatB are researched with Quantum dots multispectral imaging, laser scanning confocal microscopy (LSCFM),scanning elcetron microscope (SEM) and fourier transform infrared spectroscopy (FTIR). The method of dynamic multi-targeted labeling with QDs is established , and the molecular mechanisms of foodborne Escherichia coli biofilms architecture formation is revealed.This research project not only contribute to the major food security problems of bacterial biofilm pollution in food industry , as well as provides new technical method and scientific theory support for research on other bacterial biofilms formation and development.
英文关键词: Quantum dots;foodborn;Escherichia coli;biofilms