title: Functional expression of the catalytic domains of two cysteine proteinases from Trypanosoma congolense.
abstract: The catalytic domains of two closely related cysteine proteinases (CP1 and CP2) from Trypanosoma congolense, referred to as C1 and C2, were expressed as proforms in Escherichia coli (C1) and in the baculovirus system (C1 and C2). While the bacterial expression system did not allow recovery of active C1, the baculovirus system led to secretion of inactive zymogens which could be processed at acidic pH into mature enzymes. Active C1 and C2 were purified from serum-free culture supernatants by anion-exchange chromatography and characterised. Their kinetic parameters and pH activity profiles confirmed the relatedness between C2 and native CP2 (congopain). These properties also underline major functional differences between C1 and C2, that appear to relate to discrete but essential sequence differences. It is likely that these two enzymes perform distinct roles in vivo, in the parasite and/or in the host-parasite relationships.
authors.affiliation: Laboratoire de Recherches et de Coordination sur les Trypanosomoses, IRD-CIRAD, Campus international de Baillarguet, 34398, Montpellier Cedex 5, France.
authors.forename: A
authors.initials: A
authors.lastname: Boulangé
authors.forename: C
authors.initials: C
authors.lastname: Serveau
authors.forename: M
authors.initials: M
authors.lastname: Brillard
authors.forename: C
authors.initials: C
authors.lastname: Minet
authors.forename: F
authors.initials: F
authors.lastname: Gauthier
authors.forename: A
authors.initials: A
authors.lastname: Diallo
authors.forename: G
authors.initials: G
authors.lastname: Lalmanach
authors.forename: E
authors.initials: E
authors.lastname: Authié
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D016367:Baculoviridae / Q000235:genetics; D020134:Catalytic Domain; D002852:Chromatography, Ion Exchange / Q000662:veterinary; D003546:Cysteine Endopeptidases / Q000235:genetics / Q000276:immunology / Q000378:metabolism / Q000502:physiology*; D004591:Electrophoresis, Polyacrylamide Gel / Q000662:veterinary; D000939:Epitopes / Q000235:genetics / Q000276:immunology / Q000502:physiology; D004926:Escherichia coli / Q000821:virology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008969:Molecular Sequence Data; D017510:Protein Folding; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D014348:Trypanosoma congolense / Q000201:enzymology* / Q000235:genetics
chemical_list: D000939:Epitopes; D011994:Recombinant Proteins; D003546:Cysteine Endopeptidases