Induction kinetics and cell surface distribution of Escherichia coli lipoprotein under lac promoter control - PubMed (original) (raw)

Induction kinetics and cell surface distribution of Escherichia coli lipoprotein under lac promoter control

H Hiemstra et al. J Bacteriol. 1986 Oct.

Abstract

The induction kinetics and surface accessibility of the outer membrane lipoprotein were studied in an Escherichia coli strain with the lpp gene under control of the lac promoter. Free lipoprotein appeared rapidly after induction with isopropyl-beta-D-thiogalactopyranoside and reached a steady-state level after 30 min. The newly induced lipoprotein was slowly bound to the peptidoglycan layer. Immunological methods were developed to detect lipoprotein accessible at the cell surface after various pretreatments as well as peptidoglycan-bound lipoprotein at the surface of isolated peptidoglycan sacculi with specific antibodies in combination with 125I-protein A. With these methods an increase in lipoprotein molecules at the cell surface and bound to the peptidoglycan sacculus could be detected following induction. The topology of newly synthesized lipoprotein was examined in thin sections as well as at the cell surface and the surface of the peptidoglycan sacculus with immunoelectron microscopy. Ultrathin cell sections, whole cells, and isolated peptidoglycan sacculi showed lipoprotein distributed homogeneously over the entire surface.

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