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J Bacteriol. 1980 July; 143(1): 151-157

Outer membrane protein e of Escherichia coli K-12 is co-regulated with alkaline phosphatase.

ABSTRACT

Outer membrane protein e is induced in wild-type cells, just like alkaline phosphatase and some other periplasmic proteins, by growth under phosphatase limitation. nmpA and nmpB mutants, which synthesize protein e constitutively, are shown also to produce the periplasmic enzyme alkaline phosphatase constitutively. Alternatively, individual phoS, phoT, and phoR mutants as well as pit pst double mutants, all of which are known to produce alkaline phosphatase constitutively, were found to be constitutive for protein e. Also, the periplasmic space of most nmpA mutants and of all nmpB mutants grown in excess phosphate was found to contain, in addition to alkaline phosphatase, at least two new proteins, a phenomenon known for individual phoT and phoR mutants as well as for pit pst double mutants. The other nmpA mutants as well as phoS mutants lacked one of these extra periplasmic proteins, namely the phosphate-binding protein. From these data and from the known positions of the mentioned genes on the chromosomal map, it is concluded that nmpB mutants are identical to phoR mutants. Moreover, some nmpA mutants were shown to be identical to phoS mutants, whereas other nmpA mutants are likely to contain mutations in one of the genes phoS, phoT, or pst.

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