Escherichia coli SecB, SecA, and SecY proteins are required for expression and membrane insertion of the bacteriocin release protein, a small lipoprotein.
The SecB, SecA, and SecY dependency of a small outer membrane lipoprotein in Escherichia coli, the bacteriocin release protein (BRP), was studied. The detrimental effect of BRP expression on the culture turbidity (quasi-lysis) was strongly reduced in the sec mutants. Immunoblotting and radioactive labeling experiments showed that the expression, membrane insertion, and processing of the BRP precursor are dependent on SecB, SecA, and SecY. Labeling experiments with hybrid BRP gene constructs revealed that the mature part of the BRP precursor and not its stable signal sequence is important for its SecB dependency.
Oudega
B
B
Department of Molecular Microbiology, Faculty of Biology, Vrije Universiteit, Amsterdam, The Netherlands.
Mol
O
O
van Ulsen
P
P
Stegehuis
F
F
van der Wal
F J
FJ
Luirink
J
J
D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001430:Bacteriocins / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D015151:Immunoblotting; D007700:Kinetics; D026901:Membrane Transport Proteins; D009154:Mutation; D000069816:SEC Translocation Channels; D000081416:SecA Proteins
D001426:Bacterial Proteins; D001430:Bacteriocins; D029968:Escherichia coli Proteins; D026901:Membrane Transport Proteins; D000069816:SEC Translocation Channels; C057842:SecB protein, Bacteria; C057841:SecY protein, E coli; C052368:cloacin DF13-encoded bacteriocin release protein, E coli; D000251:Adenosine Triphosphatases; D000081416:SecA Proteins