Wandersman C, Schwartz M
Proc Natl Acad Sci U S A. 1978 Nov;75(11):5636-9. doi: 10.1073/pnas.75.11.5636.
Protein Ia and the lamB protein are both located in the outer membrane of Escherichia coli K-12. The lamB protein is known to be the receptor for phage lambda. Datta et al. [Datta, D. B., Arden, B. & Henning, U. (1977) J. Bacteriol. 131, 821--829] recently isolated a phage called TuIa that uses protein Ia for its adsorption. While phage TuIa fails to grow on ompB mutants, which lack protein Ia, we show here that host-range mutants of TuIa can be isolated that do grow on ompB strains. These host-range mutants fail to grow on ompB lamB double mutants, but retain the ability of the parental phage to grow on ompB+ lamB strains. They are therefore apparently able to use either protein Ia or the lamB protein for their adsorption. Genetic evidence suggests that essentially the same site on the lamB protein may be interacting with phage lambda or the host-range mutants of phage TuIa.
蛋白质Ia和lamB蛋白都位于大肠杆菌K-12的外膜中。已知lamB蛋白是噬菌体λ的受体。达塔等人[达塔,D.B.,阿登,B.和亨宁,U.(1977年)《细菌学杂志》131卷,821 - 829页]最近分离出一种名为TuIa的噬菌体,它利用蛋白质Ia进行吸附。虽然噬菌体TuIa在缺乏蛋白质Ia的ompB突变体上无法生长,但我们在此表明,可以分离出能在ompB菌株上生长的TuIa宿主范围突变体。这些宿主范围突变体在ompB lamB双突变体上无法生长,但保留了亲代噬菌体在ompB + lamB菌株上生长的能力。因此,它们显然能够利用蛋白质Ia或lamB蛋白进行吸附。遗传证据表明,lamB蛋白上基本上相同的位点可能与噬菌体λ或噬菌体TuIa的宿主范围突变体相互作用。