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Published on October 17, 2002; 10.1104/pp.010280

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Received June 18, 2002
Returned for revision June 28, 2002
Accepted July 4, 2002

Characterization of a NifS-Like Chloroplast Protein from Arabidopsis. Implications for Its Role in Sulfur and Selenium Metabolism

Elizabeth A.H. Pilon-Smits *, Gulnara F. Garifullina , Salah Abdel-Ghany , Shin-Ichiro Kato , Hisaaki Mihara , Kerry L. Hale , Jason L. Burkhead , Nobuyoshi Esaki , Tatsuo Kurihara , and Marinus Pilon

Biology Department, Colorado State University, Fort Collins, Colorado 80523 (E.A.H.P.-S., G.F.G., S.A.-G., K.L.H., J.L.B., M.P.); and Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan (S.-I.K., H.M., N.E., T.K.)

* Corresponding author; email: epsmits{at}lamar.colostate.edu.

NifS-like proteins catalyze the formation of elemental sulfur (S) and alanine from cysteine (Cys) or of elemental selenium (Se) and alanine from seleno-Cys. Cys desulfurase activity is required to produce the S of iron (Fe)-S clusters, whereas seleno-Cys lyase activity is needed for the incorporation of Se in selenoproteins. In plants, the chloroplast is the location of (seleno) Cys formation and a location of Fe-S cluster formation. The goal of these studies was to identify and characterize chloroplast NifS-like proteins. Using seleno-Cys as a substrate, it was found that 25% to 30% of the NifS activity in green tissue in Arabidopsis is present in chloroplasts. A cDNA encoding a putative chloroplast NifS-like protein, AtCpNifS, was cloned, and its chloroplast localization was confirmed using immunoblot analysis and in vitro import. AtCpNIFS is expressed in all major tissue types. The protein was expressed in Escherichia coli and purified. The enzyme contains a pyridoxal 5' phosphate cofactor and is a dimer. It is a type II NifS-like protein, more similar to bacterial seleno-Cys lyases than to Cys desulfurases. The enzyme is active on both seleno-Cys and Cys but has a much higher activity toward the Se substrate. The possible role of AtCpNifS in plastidic Fe-S cluster formation or in Se metabolism is discussed.




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