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J. Biol. Chem., Vol. 279, Issue 11, 10243-10251, March 12, 2004
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From the Institut für Allgemeine Botanik und Pflanzenphysiologie, Friedrich-Schiller-Universität Jena, Dornburger Strasse 159, 07747 Jena, Germany
Hcf101-1 is a high-chlorophyll-fluorescence (hcf) Arabidopsis mutant that lacks photosystem I (1). Photosystem I subunits are synthesized in the mutant but do not assemble into a stable complex. hcf101 was isolated by map-based cloning and encodes an MRP-like protein with a nucleotide-binding domain. The protein is localized in the chloroplast stroma. In green tissue, the Hcf101 level is stimulated by light, and the protein is not detectable in roots. Two independent knock-out lines, hcf101-2 and hcf101-3, are also impaired in Hcf101 accumulation, although to different extents. Like hcf101-1, hcf101-2 and hcf01-3 are hcf mutants with impaired photosystem I. Our results indicate that Hcf101 is a novel component required for photosystem I biosynthesis.
Received for publication, August 20, 2003 , and in revised form, November 24, 2003.
* This work was supported by German Research Foundation Grant OE133/9-1 and a stipend from the Friedrich-Schiller-University, Jena, (to J. S.) The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EBI Data Bank with accession number(s) AJ540304
To whom correspondence should be addressed. Tel.: 49-3641-949-231; Fax: 49-3641-949-232; E-mail: b7oera{at}uni-jena.deemail.
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