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Quantitative determination of FtsA at different growth rates in Escherichia coli using monoclonal antibodies
Author(s) -
Wang Haichao,
Gayda Randall C.
Publication year - 1992
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.1365-2958.1992.tb01428.x
Subject(s) - monoclonal antibody , biology , escherichia coli , antibody , microbiology and biotechnology , monoclonal , enterobacteriaceae , spleen , cell division , cell , biochemistry , gene , immunology
Summary FtsA is an essential cell division protein in Escherichia coli. Its synthesis in low amounts makes the investigation of its functions difficult. Partially purified FtsA protein was obtained by solubilizing cellular inclusion bodies after overexpression of the ftsA gene for the purpose of raising monoclonal antibodies. Mice were immunized with this FtsA protein fraction and their spleen cells were fused to Sp2/0‐AG14 mouse myeloma cells. Hybrid cells were screened and two clones were positively identified as FtsA monoclonal antibody producers by enzyme‐linked immunosorbent assay and Western blotting. A quantitative assay using these monoclonal antibodies indicated that the average number of FtsA molecules per cell to be between 50 and 200. However, the concentration of FtsA protein normalized to total cell protein was constant over a wide range of growth rates. This finding is in agreement with the hypothesized role of FtsA protein as a stoichiometric component of the septum.