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e tobacco bZIP transcription factor, TBZF, functions in leaf senescence and oral development. In order to identify TBZF-interaction partner(s), we screened a cDNA library constructed from leaves of tobacco (Nicotiana tabacum cv. Xanthi) by the yeast two hybrid method. Among 16 clones initially identi ed, one clone was further characterized because of its highly speci c binding to the bait. e full length cDNA of 776 bp encoded a polypeptide of 12.5 kDa, which was designated NtTIP1 (Nicotiana tabacum TBZF-Interaction Protein 1). A high similarity was scored to potato CI21A, a member of the ASR/CI21 family of proteins, most of which are induced by biotic and abiotic stresses. NtTIP1 was revealed to be localized in the nucleus by uorescence assay of NtTIP1-GFP fusion protein in onion epidermal cells. Both NtTIP1 and TBZF transcripts accumulated at high levels in owers and senescing leaves. e expressional correlation was also observed particularly a er 6 h cold stress, and a er ABA, JA and ethylene treatments. e results suggest that NtTIP1 and TBZF form a complex in vivo, and they possibly function in ower development and stress response.

Identification and properties of a small protein that interacts with a tobacco bZIP-type transcription factor TBZF