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The expression of Pseudomonas aeruginosa PAK pilin gene mutants in Escherichia coli
Author(s) -
Pasloske B. L.,
Carpenter M. R.,
Frost L. S.,
Finlay B. B.,
Paranchych† W.
Publication year - 1988
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.1988.tb00020.x
Subject(s) - pilin , biology , mutant , escherichia coli , pilus , protein subunit , cytoplasm , gene , microbiology and biotechnology , pseudomonas aeruginosa , amino acid , genetics , bacteria
Summary Previous work has demonstrated the expression of the cloned pilin gene of Pseudomonas aeruginosa PAK within Escherichia coli and has pinpointed this protein's localization exclusively to the cytoplasmic membrane (Finlay et al. , 1986). To define regions of the pilin subunit necessary for its stability and transport within E. coli , we constructed six mutants of the pilin gene and studied their expression and localization using a T7 promoter system. Two of the mutants have either a 4‐ or 8‐amino‐acid deletion at the N‐terminus and both were stably expressed and transported primarily to the cytoplasmic membrane of E. coli. The other four mutants are C‐terminal truncations having between 36 and 56 amino acids of the C‐terminal region of the unprocessed pilin. Studies with these truncated mutants revealed that only the first 36 residues of the unprocessed pilin subunit were required for insertion into the E. coli membrane.