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Infection and Immunity, December 1999, p. 6572-6582, Vol. 67, No. 12
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Leptospiral Outer Membrane Proteins OmpL1 and
LipL41 Exhibit Synergistic Immunoprotection
David A.
Haake,1,2,*
Mary K.
Mazel,1
Adam M.
McCoy,1,
Frank
Milward,3
Garlo
Chao,1
James
Matsunaga,1 and
Elizabeth A.
Wagar4
Division of Infectious Diseases, Veterans
Affairs Greater Los Angeles Healthcare System, Los Angeles,
California 900731; Department of
Medicine2 and Department of Pathology
and Laboratory Medicine,4 UCLA School of
Medicine, Los Angeles, California 90095; and
Predéveloppement, Merial Biodivision, 69342 Lyon
Cédex 07, France3
Received 27 May 1999/Returned for modification 23 July
1999/Accepted 2 September 1999
New vaccine strategies are needed for prevention of leptospirosis,
a widespread human and veterinary disease caused by invasive spirochetes belonging to the genus Leptospira. We have
examined the immunoprotective capacity of the leptospiral porin OmpL1
and the leptospiral outer membrane lipoprotein LipL41 in the Golden Syrian hamster model of leptospirosis. Specialized expression plasmids
were developed to facilitate expression of leptospiral proteins in
Escherichia coli as the membrane-associated proteins OmpL1-M and LipL41-M. Although OmpL1-M expression is highly toxic in
E. coli, this was accomplished by using plasmid
pMMB66-OmpL1, which has undetectable background expression without
induction. LipL41-M expression and processing were enhanced by altering
its lipoprotein signal peptidase cleavage site to mimic that of the murein lipoprotein. Active immunization of hamsters with E. coli membrane fractions containing a combination of OmpL1-M and
LipL41-M was found to provide significant protection against homologous challenge with Leptospira kirschneri serovar grippotyphosa.
At 28 days after intraperitoneal inoculation, survival in animals vaccinated with both proteins was 71% (95% confidence interval [CI], 53 to 89%), compared with only 25% (95% CI, 8 to 42%) in the control group (P < 0.001). On the basis of
serological, histological, and microbiological assays, no evidence of
infection was found in the vaccinated survivors. The protective effects
of immunization with OmpL1-M and LipL41-M were synergistic, since
significant levels of protection were not observed in animals immunized
with either OmpL1-M or LipL41-M alone. In contrast to immunization with
the membrane-associated forms of leptospiral proteins, hamsters immunized with His6-OmpL1 and His6-LipL41
fusion proteins, either alone or in combination, were not protected.
These data indicate that the manner in which OmpL1 and LipL41
associates with membranes is an important determinant of immunoprotection.
*
Corresponding author. Mailing address: Division of
Infectious Diseases, 111F, VA Greater LA Healthcare System, Los
Angeles, CA 90073. Phone: (310) 478-3711, ext. 40267. Fax: (310)
268-4928. E-mail: dhaake{at}ucla.edu.

Present address: Harvard University, The Biological Laboratories,
Cambridge, MA
02138.
Infection and Immunity, December 1999, p. 6572-6582, Vol. 67, No. 12
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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