Abstract
The protein components of the NADP/thioredoxin system, NADP-thioredoxin reductase (NTR) and thioredoxin h, have been purified and characterized from the green alga, Chlamydomonas reinhardtii. The analysis of this system confirms that photoautotrophic Chlamydomonas cells resemble leaves in having both an NADP- and ferrodoxin-linked thioredoxin redox system. Chlamydomonas thioredoxin h, which is smaller on sodium dodecyl sulfate-polyacrylamide gel electrophoresis than thioredoxin m from the same source, cross-reacted with antisera to thioredoxin h from spinach (Spinacia oleracea L.) and wheat germ (Triticum vulgaris L.) but not with antisera to m or f thioredoxins. In these properties, the thioredoxin h resembled a thioredoxin from Chlamydomonas, designated Ch1, whose sequence was reported recently (P. Decottignies et al., 1991, Eur. J. Biochem. 198, 505–512). The differential reactivity of thioredoxin h with antisera was used to demonstrate that thioredoxin h is enriched outside the chloroplast. The NTR was purified from Chlamydomonas using thioredoxin h from the same source. Similar to its counterpart from other organisms, Chlamydomonas NTR had a subunit size of approx. 36 kDa and was specific for NADPH. Chlamydomonas NTR effectively reduced thioredoxin h from the same source but showed little activity with the other thioredoxins tested, including spinach thioredoxin h and Escherichia coli thioredoxin. Comparison of the reduction of Chlamydomonas thioredoxins m and h by each of the endogenous thioredoxin reductases, NTR and ferredoxin-thioredoxin reductase, revealed a differential specificity of each enzyme for thioredoxin. Thus, NTR showed increased activity with thioredoxin h and ferredoxin-thioredoxin reductase with thioredoxins m and f.
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Abbreviations
- DEAE:
-
diethylaminoethyl
- DTNB:
-
dithiobis(2-nitrobenzoic acid)
- Fd:
-
ferredoxin
- FTR:
-
ferredoxin-thioredoxin reductase
- HPLC:
-
high-pressure liquid chromatography
- Mr :
-
relative molecular mass
- NADP-MDH:
-
NADP-malate dehydrogenase
- NTR:
-
NADP-thioredoxin reductase
- SDS-PAGE:
-
sodium dodecyl sulfate-polyacrylamide gel electrophoresis
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We thank Dr. P. Decottiginies for work on the HPLC, Dr. J.-P. Jacquot for help and discussion, Dr. M. Hodges for discussion and reading of the manuscript, Mme. Anne Trouabal for maintenance of our cell cultures and Dr. P. Gadal for providing facilities. H.C.H. was supported during this work by a Chateaubriand Fellowship. This work was supported in part by grant from the US-France Program of the National Science Foundation/Centre National de la Recerche Scientifique, and the National Aeronautics and Space Administration.
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Huppe, H.C., Picaud, A., Buchanan, B.B. et al. Identification of an NADP/thioredoxin system in Chlamydomonas reinhardtii . Planta 186, 115–121 (1991). https://doi.org/10.1007/BF00201506
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DOI: https://doi.org/10.1007/BF00201506