Koval Susan F, Bayer Manfred E
Department of Microbiology and Immunology University of Western Ontario London, ON N6A 5C1 Canada.
Fox Chase Cancer Center Institute for Cancer Research 7701 Burholme Avenue, Philadelphia, PA 19111 USA.
Microbiology (Reading). 1997 Mar;143 ( Pt 3):749-753. doi: 10.1099/00221287-143-3-749.
Bdellovibrio bacteriovorus 109J attached to both capsulated and non-capsulated Escherichia coli K29 cells. Electron microscopy revealed penetration of the thick polysaccharide capsule without any major disintegration of the neighbouring capsular matrix. The capsule remained intact during bdelloplast formation and lysis was unaffected by capsulation of the prey cell. This study shows that, in contrast to its effect on bacteriophage penetration and its protective activities against immune defence mechanisms, the capsule of E. coli does not serve as a barrier against invasion by B. bacteriovorus.
食菌蛭弧菌109J可附着于有荚膜和无荚膜的大肠杆菌K29细胞。电子显微镜观察显示，其能穿透厚厚的多糖荚膜，且相邻的荚膜基质未发生任何重大解体。在蛭弧体形成过程中，荚膜保持完整，猎物细胞的荚膜化对裂解没有影响。这项研究表明，与荚膜对噬菌体穿透的影响及其对免疫防御机制的保护作用相反，大肠杆菌的荚膜并不能作为抵御食菌蛭弧菌入侵的屏障。
