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A comparative study on the phoE genes of three enterobacterial species. Implications for structure-function relationships in a pore-forming protein of the outer membrane

Authors :
Jan Tommassen
Joop van Meersbergen
Peter van der Ley
August C.A.P.A. Bekkers
Source :
European Journal of Biochemistry. 164:469-475
Publication Year :
1987
Publisher :
Wiley, 1987.

Abstract

The cloned phoE genes from Enterobacter cloacae and Klebsiella pneumoniae are normally expressed and regulated in Escherichia coli K-12, and their products are correctly assembled into the outer membrane. Differences between the three PhoE proteins were found with binding of two out of ten monoclonal antibodies directed against the cell-surface-exposed part and in pore characteristics, but not in phage receptor function. The DNA sequences of the E. cloacae and K. pneumoniae phoE genes were determined and used to predict the primary structures of the encoded proteins. In the upstream non-coding regions, which showed more variations among the three genes than the coding regions, conserved sequences were identified which might be involved in regulation of phoE gene expression. Comparison of the predicted PhoE primary structures revealed a high degree of homology, with 81% of the amino acid residues being identical in all three proteins. Four small variable regions were found where differences are the most pronounced, corresponding to regions which were previously predicted to be exposed at the cell surface. Implications of the sequence comparison for structure-function relationships in PhoE protein are discussed.

Details

ISSN :
14321033 and 00142956
Volume :
164
Database :
OpenAIRE
Journal :
European Journal of Biochemistry
Accession number :
edsair.doi.dedup.....5391291617c0d899feccde4d143f425a
Full Text :
https://doi.org/10.1111/j.1432-1033.1987.tb11080.x