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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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The yeast two-hybrid system was used to investigate dimerization between proteins of Phz2 and Phz4 clones of the homeodomain-leucine zipper family which were obtained by screening a Pimpinella brachycarpa shoot-tip cDNA library. Assays showed that Phz4 formed a homo rather than a heterodimer with Phz2. In addition, we isolated cDNA clones, Phyb1, Phyb2, and Phyb3, that encode proteins interacting with Phz4. Although Phyb1 is not a HD-Zip protein, the activity of interaction between Phyb1 and Phz4 was, surprisingly, stronger thn that of the homodimerization of Phz4. The analysis fo interacting parts indicated that from 1 bp to 466 bp of Phyb1, there was no interaction with Phz4, but from 467 bp to 593 bp, interactions were found with the N-terminal and C-terminal regions, except for HD-Zip of Phz4. This region of Phyb1 contained a nuclear localization signal. DNA-binding analysis showed that the Phz4 HD-Zip domain recognized the [T(C/G)ATTG] core sequence and the region containing the [TCATTG] motif, which is, in itself, a promoter in vitro.
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