Transactivation properties of parsley proline-rich bZIP transcription factors

Sprenger-Haussels M, Weisshaar B (2000)
The Plant Journal 22(1): 1-8.

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Light-responsive chalcone synthase (CHS) gene activation requires LRUCHS, a light regulatory promoter unit including the MYB recognition element MRECHS and the ACGT-containing element ACECHS. ACECHS is bound by the parsley basic region/leucine zipper (bZIP) factors CPRF1 and 4. Factors containing the bZIP domain exist in animals, plants and yeast, and recognize DNA sequence-specifically after formation of homo- or heterodimers. To determine the potential role of CPRFs in the regulation of CHS promoter activity, we investigated the functions of distinct CPRF domains in a homologous co-transfection system. The proline-rich domains of CPRF1 and CPRF4 activate transcription, indicating that CPRF1 and CPRF4 have transactivating properties. Over-expression of the CPRF1 bZIP domain caused a reduction of LRUCHS-mediated light inducibility, and point mutations throughout ACECHS affected both responsiveness to UV-containing white light and transactivation by CPRF1:VP16. The data suggest that a CPRF1-containing bZIP heterodimer interacts with ACECHS in vivo. We discuss regulatory steps in light-induced CHS transcription that may be influenced by CPRF1 and/or related bZIP factors.
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Sprenger-Haussels M, Weisshaar B. Transactivation properties of parsley proline-rich bZIP transcription factors. The Plant Journal. 2000;22(1):1-8.
Sprenger-Haussels, M., & Weisshaar, B. (2000). Transactivation properties of parsley proline-rich bZIP transcription factors. The Plant Journal, 22(1), 1-8.
Sprenger-Haussels, M., and Weisshaar, B. (2000). Transactivation properties of parsley proline-rich bZIP transcription factors. The Plant Journal 22, 1-8.
Sprenger-Haussels, M., & Weisshaar, B., 2000. Transactivation properties of parsley proline-rich bZIP transcription factors. The Plant Journal, 22(1), p 1-8.
M. Sprenger-Haussels and B. Weisshaar, “Transactivation properties of parsley proline-rich bZIP transcription factors”, The Plant Journal, vol. 22, 2000, pp. 1-8.
Sprenger-Haussels, M., Weisshaar, B.: Transactivation properties of parsley proline-rich bZIP transcription factors. The Plant Journal. 22, 1-8 (2000).
Sprenger-Haussels, M., and Weisshaar, Bernd. “Transactivation properties of parsley proline-rich bZIP transcription factors”. The Plant Journal 22.1 (2000): 1-8.
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