Identification of a calmodulin-binding NAC protein as a transcriptional repressor in Arabidopsisopen access
- Authors
- Kim, Ho Soo; Park, Byung Ouk; Yoo, Jae Hyuk; Jung, Mi Soon; Lee, Sang Min; Han, Hay Ju; Kim, Kyung Eun; Kim, Sun Ho; Lim, Chae Oh; Yun, Dae-Jin; Lee, Sang Yeol; Chung, Woo Sik
- Issue Date
- 14-Dec-2007
- Publisher
- AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
- Citation
- JOURNAL OF BIOLOGICAL CHEMISTRY, v.282, no.50, pp.36292 - 36302
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF BIOLOGICAL CHEMISTRY
- Volume
- 282
- Number
- 50
- Start Page
- 36292
- End Page
- 36302
- URI
- https://scholarworks.bwise.kr/gnu/handle/sw.gnu/28204
- DOI
- 10.1074/jbc.M705217200
- ISSN
- 0021-9258
- Abstract
- Calmodulin (CaM), a ubiquitous calcium- binding protein, regulates diverse cellular functions by modulating the activity of a variety of proteins. However, little is known about how CaM directly regulates transcription. Screening of an Arabidopsis cDNA expression library using horseradish peroxidase- conjugated calmodulin as a probe identified a calmodulin- binding NAC protein (CBNAC). Using gel overlay assays, a Ca2+-dependent CaM-binding domain was identified in the C terminus of this protein. Specific binding of CaM to CaM-binding domain was corroborated by site-directed mutagenesis and a split-ubiquitin assay. Using a PCR-mediated random binding site selection method, we identified a DNA-binding sequence (CBNACBS) for CBNAC, which consisted of a GCTT core sequence flanked on both sides by other frequently repeating sequences (TTGCTTANNNNNNAAG). CBNAC was able to bind to CBNACBS, which resulted in the repression of transcription in Arabidopsis protoplasts. Interestingly, the transcriptional repression mediated by CBNAC was enhanced by CaM. These results suggest that CBNAC may be a CaM-regulated transcriptional repressor in Arabidopsis.
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