阿拉伯芥中FIN219和光型態發生突變體之間的功能性研究

黃瓊慧

doi:10.6342/NTU.2005.00870

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阿拉伯芥中FIN219和光型態發生突變體之間的功能性研究

Investigation of functional relationship between FIN219 and photomorphogenic mutants in Arabidopsis

黃瓊慧 , Masters　　Advisor：謝旭亮　　

繁體中文 DOI： 10.6342/NTU.2005.00870

FIN219 ；光敏素A ；阿拉伯芥； FIN219 ； PHYA ； Arabidopsis

Abstract │ Reference (105) │ Altmetrics

Abstract 〈TOP〉

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phyA is the photoreceptor of far-red light perception in Arabidopsis and mediates the inhibition of the hypocotyl elongation under FR light. phyA has two domains : the N-terminal photosensory domain with a chromophore-binding site and the C-terminal domain which contains signaling motifs such as a kinase domain. FIN219 (far-red insensitive 219) is involved in phytochrome A-mediated inhibition of hypocotyl elongation in FR signaling. Two coiled-coil domains, believed to be involved in protein-protein interactions, are found in FIN219 with one in the N-terminus and the other in the C-terminus. The N-terminal region of FIN219 has 43% similarity at amino acid levels to the GAF domain of PHYA. GH3-10 is a member of the GH3-like gene family in Arabidopsis. Sequence comparison between FIN219 and GH3-10 indicates that there is 47% identity at amino acid level. Hence, we try to understand the functional relationship among FIN219, GH3-10 and phyA to reveal the physiological significance of the similarity.
Yeast 2-hybrid interaction studies have revealed that FIN219 can interact with the full length of GH3-10 and the C-terminus of PHYA. Epistatic analysis reveals that FIN219 functions in downstream of the photoreceptor phyA, and its expression is much reduced in the phyA mutant only under FR condition, which suggests that FIN219 function is dependent on the presence of phyA. In addition, the transgenic plants overexpressing the full-length, N- or -C terminal regions of PHYA in wild type background display shorter hypocotyl phenotype as compared to wild type under FR. Other phenotypes such as anthocyanin accumulation, chlorophyll contents, CHS gene expression and flowering time mediated by phyA are consistently enhanced or the same as wild type when N- or -C terminal regions of PHYA are overexpressed in wild type rather than in phyA mutant, which implies that both the N-terminal and the C-terminal domains are functional and able to trigger signal transductions only in the presence of phyA.

Reference ( 105 ) 〈TOP〉

Ahmad, M., and Cashmore, A.R. (1996). The pef mutants of Arabidopsis thaliana define lesions early in the phytochrome signaling pathway. Plant J 10, 1103-1110.
連結：
Ahmad, M., Lin, C., and Cashmore, A.R. (1995). Mutations throughout an Arabidopsis blue-light photoreceptor impair blue-light-responsive anthocyanin accumulation and inhibition of hypocotyl elongation. Plant J 8, 653-658.
連結：
Ahmad, M., Jarillo, J.A., and Cashmore, A.R. (1998). Chimeric proteins between cry1 and cry2 Arabidopsis blue light photoreceptors indicate overlapping functions and varying protein stability. Plant Cell 10, 197-207.
連結：
Ang, L.H., and Deng, X.W. (1994). Regulatory hierarchy of photomorphogenic loci: allele-specific and light-dependent interaction between the HY5 and COP1 loci. Plant Cell 6, 613-628.
連結：
Ballesteros, M.L., Bolle, C., Lois, L.M., Moore, J.M., Vielle-Calzada, J.P., Grossniklaus, U., and Chua, N.H. (2001). LAF1, a MYB transcription activator for phytochrome A signaling. Genes Dev 15, 2613-2625.
連結：

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