Bradley D E, Cohen D R
J Gen Microbiol. 1976 Nov;97(1):91-103. doi: 10.1099/00221287-97-1-91.
The bacterial drug-resistance plasmids Sa, R388 and R7K that comprise the W compatability group were transferred by conjugation to species in the genera Escherichia, Salmonella, Shigella and Pseudomonas, chosen for their lack of common pili. On receiving the W plasmids, all strains produced pili, which were similar morphologically, at average frequencies of up to 3-0 pila/cell. The pili determined by the W plasmids were also related serologically, but unrelated to those of other plasmids. R- segregant strains which had lost their plasmids showed a simultaneous loss of both pili and drug-resistance characteristics. W-pili are pointed flexible filaments 10 to 12 nm thick, with an average length of 450 nm. The best host found was Salmonella typhimurium.
属于W相容性群的细菌耐药质粒Sa、R388和R7K通过接合转移至埃希氏菌属、沙门氏菌属、志贺氏菌属和假单胞菌属的细菌，这些细菌因缺乏普通菌毛而被选中。在获得W质粒后，所有菌株均产生菌毛，其形态相似，平均频率高达每个细胞3.0根菌毛。由W质粒决定的菌毛在血清学上也相关，但与其他质粒的菌毛无关。丢失质粒的R-分离菌株同时丧失了菌毛和耐药特性。W菌毛是尖的、柔韧的细丝，直径为10至12纳米，平均长度为450纳米。发现的最佳宿主是鼠伤寒沙门氏菌。
