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Light-induced nuclear translocation of endogenous pea phytochrome A visualized by immunocytochemical procedures
被引:81
作者:
Hisada, A
Hanzawa, H
Weller, JL
Nagatani, A
Reid, JB
Furuya, M
[1
]
机构:
[1] Hitachi Adv Res Lab, Hatoyama, Saitama 3500395, Japan
[2] Univ Tasmania, Dept Plant Sci, Hobart, Tas 7001, Australia
[3] Kyoto Univ, Grad Sch Sci, Dept Bot, Kyoto 6068502, Japan
来源:
关键词:
D O I:
10.1105/tpc.12.7.1063
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
Although the physiological functions of phytochrome A (PhyA) are now known, the distribution of endogenous PhyA has not been examined. We have visualized endogenous PhyA apoprotein (PHYA) by immunolabeling cryosections of pea tissue, using PHYA-deficient mutants as negative controls. By this method, we examined the distribution of PHYA in different tissues and changes in its intracellular distribution in response to light. In apical hook cells of etiolated seedlings, PHYA immunolabeling was distributed diffusely in the cytosol. Exposure to continuous far-red (cFR) light caused a redistribution of the immunolabeling to the nucleus, first detectable after 1.5 hr and greatest at 4.5 hr. During this time, the amounts of spectrally active phytochrome and PHYA did not decline substantially. Exposure to continuous red (cR) light or to a brief pulse of red light also resulted in redistribution of immunolabeling to the nucleus, but this occurred much more rapidly and with a different pattern of intranuclear distribution than it did in response to cFR light. Exposures to cR light resulted in loss of immunolabeling, which was associated with PHYA degradation. These results indicate that the light-induced intracellular location of PHYA is wavelength dependent and imply that this is important for PhyA activity.
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页码:1063 / 1078
页数:16
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