BBX32, an Arabidopsis B-Box protein, functions in light signaling by suppressing HY5-regulated gene expression and interacting with STH2/BBX21 |
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Authors: | Holtan Hans E Bandong Simona Marion Colleen M Adam Luc Tiwari Shiv Shen Yu Maloof Julin N Maszle Don R Ohto Masa-Aki Preuss Sasha Meister Rob Petracek Marie Repetti Peter P Reuber T Lynne Ratcliffe Oliver J Khanna Rajnish |
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Affiliation: | Mendel Biotechnology, Inc., Hayward, California 94545, USA. |
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Abstract: | A B-box zinc finger protein, B-BOX32 (BBX32), was identified as playing a role in determining hypocotyl length during a large-scale functional genomics study in Arabidopsis (Arabidopsis thaliana). Further analysis revealed that seedlings overexpressing BBX32 display elongated hypocotyls in red, far-red, and blue light, along with reduced cotyledon expansion in red light. Through comparative analysis of mutant and overexpression line phenotypes, including global expression profiling and growth curve studies, we demonstrate that BBX32 acts antagonistically to ELONGATED HYPOCOTYL5 (HY5). We further show that BBX32 interacts with SALT TOLERANCE HOMOLOG2/BBX21, another B-box protein previously shown to interact with HY5. Based on these data, we propose that BBX32 functions downstream of multiple photoreceptors as a modulator of light responses. As such, BBX32 potentially has a native role in mediating gene repression to maintain dark adaptation. |
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