TABLE 1.
Plating properties of groP mutant bacteria
| Growth at 43° | Plaque formation by phage
|
|||
|---|---|---|---|---|
| Bacteria | λ | λπA | λπB | |
| groP+ wild type | + | + | + | + |
| groPA15 (dnaB15) | − | − | + | + |
| groPB558 (dnaB558) | − | − | − | + |
| groPAB756 (groPC756; dnaK756) | − | − | + or − | + |
The original classification scheme devised for the groP class of bacterial mutants is depicted and is taken essentially from Table 1 of Georgopoulos and Herskowitz (1971), except that the later designations of the alleles are indicated in parentheses. The λπA or λπB phage compensatory mutants were isolated as plaque formers on the indicated groP bacterial mutants at an approximate frequency of 10−7 at 37° (see text for details). The subsequent genetic designation(s) of the bacterial alleles is given in parentheses.