Cloning, expression and reconstitution of the trypanothione-dependent peroxidase system of Crithidia fasciculata

TY - JOUR

T1 - Cloning, expression and reconstitution of the trypanothione-dependent peroxidase system of Crithidia fasciculata

AU - Tetaud, Emmanuel

AU - Fairlamb, Alan H.

N1 - Funding Information: We particularly thank M.S. Alphey for technical assistance with the purification of the recombinant enzymes and M. Berriman for purified trypanothione reductase. This work was supported by the Wellcome Trust.

PY - 1998/10/30

Y1 - 1998/10/30

N2 - As a consequence of aerobic metabolism, trypanosomatids are exposed to reactive oxygen intermediates such as superoxide, hydrogen peroxide and the hydroxyl radical. Metabolism of hydrogen peroxide in Crithidia fasciculata is accomplished by three distinct proteins, tryparedoxin, tryparedoxin peroxidase and trypanothione reductase, working in concert with the substrates NADPH and trypanothione. Here, we report the cloning and characterisation of the tryparedoxin (TryX) and tryparedoxin peroxidase (TryP) genes from C. fasciculata. Both genes are multicopy and organized in distinct tandem arrays in the genome. TryX encodes a 16 kDa protein, which belongs to the thioredoxin superfamily, sharing the WCPPC motif, whereas TryP encodes a 21 kDa protein belonging to a new class of peroxidases called 2-Cys peroxidoxins. Both TryX and TryP were expressed in Escherichia coli and the purified recombinant proteins shown to utilise hydrogen peroxide in the presence of NADPH, trypanothione and trypanothione reductase, similar to the native proteins. TryX is rapidly reduced by trypanothione, but weakly by glutathionylspermidine, glutathione or ovothiol A. TryP shows a broad substrate specificity and can reduced hydrogen peroxide, t-butyl hydroperoxide and cumene hydroperoxide with equal efficiency. Copyright (C) 1998 Elsevier Science B.V.

AB - As a consequence of aerobic metabolism, trypanosomatids are exposed to reactive oxygen intermediates such as superoxide, hydrogen peroxide and the hydroxyl radical. Metabolism of hydrogen peroxide in Crithidia fasciculata is accomplished by three distinct proteins, tryparedoxin, tryparedoxin peroxidase and trypanothione reductase, working in concert with the substrates NADPH and trypanothione. Here, we report the cloning and characterisation of the tryparedoxin (TryX) and tryparedoxin peroxidase (TryP) genes from C. fasciculata. Both genes are multicopy and organized in distinct tandem arrays in the genome. TryX encodes a 16 kDa protein, which belongs to the thioredoxin superfamily, sharing the WCPPC motif, whereas TryP encodes a 21 kDa protein belonging to a new class of peroxidases called 2-Cys peroxidoxins. Both TryX and TryP were expressed in Escherichia coli and the purified recombinant proteins shown to utilise hydrogen peroxide in the presence of NADPH, trypanothione and trypanothione reductase, similar to the native proteins. TryX is rapidly reduced by trypanothione, but weakly by glutathionylspermidine, glutathione or ovothiol A. TryP shows a broad substrate specificity and can reduced hydrogen peroxide, t-butyl hydroperoxide and cumene hydroperoxide with equal efficiency. Copyright (C) 1998 Elsevier Science B.V.

KW - Drug design

KW - Peroxidoxin

KW - Thiol-specific antioxidant

KW - Thioredoxin

KW - Trypanothione peroxidase system

UR - https://www.scopus.com/pages/publications/0032582843

U2 - 10.1016/S0166-6851(98)00120-0

DO - 10.1016/S0166-6851(98)00120-0

M3 - Article

C2 - 9851611

AN - SCOPUS:0032582843

SN - 0166-6851

VL - 96

SP - 111

EP - 123

JO - Molecular and Biochemical Parasitology

JF - Molecular and Biochemical Parasitology

IS - 1-2

ER -