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Characterization of a leucine aminopeptidase of Babesia gibsoni

Published online by Cambridge University Press:  24 June 2009

H. JIA ,
M. A. TERKAWI ,
G. O. ABOGE ,
Y.-K. GOO ,
Y. LUO ,
Y. LI ,
J. YAMAGISHI ,
Y. NISHIKAWA ,
I. IGARASHI  and
C. SUGIMOTO
...Show all authors
H. JIA
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
M. A. TERKAWI
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
G. O. ABOGE
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
Y.-K. GOO
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
Y. LUO
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
Y. LI
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
J. YAMAGISHI
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
Y. NISHIKAWA
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
I. IGARASHI
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
C. SUGIMOTO
Affiliation:
Research Center for Zoonosis Control, Hokkaido University, Sapporo, Hokkaido 001-0020, Japan
K. FUJISAKI
Affiliation:
Laboratory of Emerging Infectious Diseases, Department of Frontier Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan
X. XUAN*
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
*
*Corresponding author: National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan. Tel: +81 155 49 5648. Fax: +81 155 49 5643. E-mail: gen@obihiro.ac.jp
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Summary

Peptidases of parasitic protozoa are currently under intense investigation in order to identify novel virulence factors, drug targets, and vaccine candidates, except in Babesia. Leucine aminopeptidases in protozoa, such as Plasmodium and Leishmania, have been identified to be involved in free amino acid regulation. We report here the molecular and enzymatic characterization, as well as the localization of a leucine aminopeptidase, a member of the M17 cytosolic aminopeptidase family, from B. gibsoni (BgLAP). A functional recombinant BgLAP (rBgLAP) expressed in Escherichia coli efficiently hydrolysed synthetic substrates for aminopeptidase, a leucine substrate. Enzyme activity of the rBgLAP was found to be optimum at pH 8·0 and at 37°C. The substrate profile was slightly different from its homologue in P. falciprum. The activity was also strongly dependent on metal divalent cations, and was inhibited by bestatin, which is a specific inhibitor for metalloprotease. These results indicated that BgLAP played an important role in free amino acid regulation.

Keywords

Babesia gibsonileucine aminopeptidaseenzymatic activity
Type
Research Article
Information
Parasitology , Volume 136 , Issue 9 , August 2009 , pp. 945 - 952
Copyright
Copyright © Cambridge University Press 2009

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