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Functional characterization of X-prolyl aminopeptidase from Toxoplasma gondii

Published online by Cambridge University Press:  25 May 2016

MINGFA YANG
Affiliation:
College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, China Harbin Veterinary Research Institute, CAAS-Michigan State University Joint Laboratory of Innate Immunity, State Key Laboratory of Veterinary Biotechnology, Chinese Academy of Agricultural Sciences, Harbin, China
JUN ZHENG
Affiliation:
Harbin Veterinary Research Institute, CAAS-Michigan State University Joint Laboratory of Innate Immunity, State Key Laboratory of Veterinary Biotechnology, Chinese Academy of Agricultural Sciences, Harbin, China
HONGLIN JIA
Affiliation:
Harbin Veterinary Research Institute, CAAS-Michigan State University Joint Laboratory of Innate Immunity, State Key Laboratory of Veterinary Biotechnology, Chinese Academy of Agricultural Sciences, Harbin, China
MINGXIN SONG
Affiliation:
College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, China
Corresponding

Summary

In the present study, a recombinant aminopeptidase P (rTgAPP) from Toxoplasma gondii was expressed in Escherichia coli to evaluate its enzyme parameters. The rTgAPP showed strong activity against a synthetic substrate for aminopeptidase P at pH 8·0 with a K m value of 0·255 µ m and a k cat value of 35·6 s−1. The overall catalytic efficiency (k cat/K m) of the rTgAPP was 139·6 × 105 M−1 s−1. The activity of rTgAPP was enhanced by the addition of divalent cations and inhibited by bestatin. Deletion of TgAPP gene in the parasite through a CRISPR/Cas9 system resulted in inhibition of growth indicating the importance of TgAPP. Thus our findings reveal that TgAPP is an active enzyme in T. gondii and provide an insight into the function of TgAPP.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2016 

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