Previous Article | Next Article ![]()
J. Bacteriol., 02 1997, 794-804, Vol 179, No. 3
J Maurer, J Jose and TF Meyer
The immunoglobulin A protease family of secreted proteins are derived from
self-translocating polyprotein precursors which contain C-terminal domains
promoting the translocation of the N-terminally attached passenger domains
across gram-negative bacterial outer membranes. Computer predictions
identified the C-terminal domain of the Escherichia coli adhesin involved
in diffuse adherence (AIDA-I) as a member of the autotransporter family. A
model of the beta-barrel structure, proposed to be responsible for outer
membrane translocation, served as a basis for the construction of fusion
proteins containing heterologous passengers. Autotransporter-mediated
surface display (autodisplay) was investigated for the cholera toxin B
subunit and the peptide antigen tag PEYFK. Up to 5% of total cellular
protein was detectable in the outer membrane as passenger autotransporter
fusion protein synthesized under control of the constitutive P(TK)
promoter. Efficient presentation of the passenger domains was demonstrated
in the outer membrane protease T-deficient (ompT) strain E. coli UT5600 and
the ompT dsbA double mutant JK321. Surface exposure was ascertained by
enzyme-linked immunosorbent assay, immunofluorescence microscopy, and
immunogold electron microscopy using antisera specific for the passenger
domains. In strain UT2300 (ompT+), the passenger domains were released from
the cell surface by the OmpT protease at a novel specific cleavage site, R
/ V. Autodisplay represents a useful tool for future protein translocation
studies with interesting biotechnological possibilities.
Copyright © 1997, American Society for Microbiology
Autodisplay: one-component system for efficient surface display and release of soluble recombinant proteins from Escherichia coli
Abteilung Infektionsbiologie, Max-Planck-Institut fur Biologie, Tubingen, Germany.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»