S1 domain-containing STF modulates plastid transcription and chloroplast biogenesis in Nicotiana benthamiana

Young Jeon, Hyun Ju Jung, Hunseung Kang, Youn Il Park, Soon Hee Lee, Hyun Sook Pai

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


• In this study, we examined the biochemical and physiological functions of Nicotiana benthamiana S1 domain-containing Transcription-Stimulating Factor (STF) using virus-induced gene silencing (VIGS), cosuppression, and overexpression strategies. • STF:green fluorescent protein (GFP) fusion protein colocalized with sulfite reductase (SiR), a chloroplast nucleoid-associated protein also present in the stroma. Full-length STF and its S1 domain preferentially bound to RNA, probably in a sequence-nonspecific manner. • STF silencing by VIGS or cosuppression resulted in severe leaf yellowing caused by disrupted chloroplast development. STF deficiency significantly perturbed plastid-encoded multimeric RNA polymerase (PEP)-dependent transcript accumulation. Chloroplast transcription run-on assays revealed that the transcription rate of PEP-dependent plastid genes was reduced in the STF-silenced leaves. Conversely, the exogenously added recombinant STF protein increased the transcription rate, suggesting a direct role of STF in plastid transcription. Etiolated seedlings of STF cosuppression lines showed defects in the light-triggered transition from etioplasts to chloroplasts, accompanied by reduced light-induced expression of plastid-encoded genes. • These results suggest that STF plays a critical role as an auxiliary factor of the PEP transcription complex in the regulation of plastid transcription and chloroplast biogenesis in higher plants.

Original languageEnglish
Pages (from-to)349-363
Number of pages15
JournalNew Phytologist
Issue number2
Publication statusPublished - 2012 Jan

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science


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