Buddelmeijer N, Aarsman M E, Kolk A H, Vicente M, Nanninga N
Institute for Molecular Cell Biology, BioCentrum Amsterdam, University of Amsterdam, 1098 SM Amsterdam, The Netherlands.
J Bacteriol. 1998 Dec;180(23):6107-16. doi: 10.1128/JB.180.23.6107-6116.1998.
The localization of cell division protein FtsQ in Escherichia coli wild-type cells was studied by immunofluorescence microscopy with specific monoclonal antibodies. FtsQ could be localized to the division site in constricting cells. FtsQ could also localize to the division site in ftsQ1(Ts) cells grown at the permissive temperature. A hybrid protein in which the cytoplasmic domain and the transmembrane domain were derived from the gamma form of penicillin-binding protein 1B and the periplasmic domain was derived from FtsQ was also able to localize to the division site. This result indicates that the periplasmic domain of FtsQ determines the localization of FtsQ, as has also been concluded by others for the periplasmic domain of FtsN. Noncentral FtsQ foci were found in the area of the cell where the nucleoid resides and were therefore assumed to represent sites where the FtsQ protein is synthesized and simultaneously inserted into the cytoplasmic membrane.
利用特异性单克隆抗体,通过免疫荧光显微镜技术研究了细胞分裂蛋白FtsQ在大肠杆菌野生型细胞中的定位。FtsQ可定位于正在缢缩细胞的分裂位点。在允许温度下生长的ftsQ1(Ts)细胞中,FtsQ也可定位于分裂位点。一种杂合蛋白,其胞质结构域和跨膜结构域源自青霉素结合蛋白1B的γ形式,周质结构域源自FtsQ,该杂合蛋白也能够定位于分裂位点。这一结果表明,FtsQ的周质结构域决定了FtsQ的定位,其他人对FtsN的周质结构域也得出了同样的结论。在类核所在的细胞区域发现了非中央FtsQ焦点,因此推测这些焦点代表FtsQ蛋白合成并同时插入细胞质膜的位点。