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Annu. Rev. Microbiol. 2002. 56:17–38
doi: 10.1146/annurev.micro.56.012302.160310
c
Copyright 2002 by Annual Reviews. All rights reserved
First published online as a Review in Advance on April 26, 2002
FUNCTION OF PSEUDOMONAS PORINS
IN UPTAKE AND EFFLUX
Robert E. W. Hancock1 and Fiona S. L. Brinkman2
1Department of Microbiology and Immunology, University of British Columbia,
g Vancouver, BC, Canada V6T 1Z3; e-mail: bob@cmdr.ubc.ca
r
o
. 2
s Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888
w
e University Dr., Burnaby, BC, Canada V5A 1S6; e-mail: brinkman@sfu.ca
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a o
u
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a. u Key Words antibiotic resistance, Pseudomonas aeruginosa, OprM, OprF, OprD
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s a
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a n
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r s Abstract Porins are proteins that form water-filled channels across the outer
u r
o e
j p membranes of Gram-negative bacteria and thus make this membrane semipermeable.
r
a r
o There are four types of porins: general/nonspecific porins, substrate-specific porins,
m F
o .
r 0 gated porins, and efflux porins (also called channel-tunnels). The recent publication of
f 1
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e 1 the genomic sequence of Pseudomonas aeruginosa PAO1 has dramatically increased
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o 0 our understanding of the porins of this organism. In particular this organism has 3
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