Immunopurification and initial characterization of dicotyledonous phytochrome
1Botany Department, University of Georgia, Athens, Georgia 30602.
Plant Physiology
|February 1, 1982
Summary
This study developed a method to purify phytochrome from zucchini squash using specific antibodies. The purified phytochrome shares characteristics with other dicot phytochromes, aiding plant science research.
Area of Science:
- Plant molecular biology
- Photochemistry
- Protein biochemistry
Background:
- Phytochrome is a crucial photoreceptor in plants, regulating various light-dependent processes.
- Understanding phytochrome structure and function is vital for plant science and agriculture.
- Previous studies focused on phytochrome from monocots like oats, necessitating research on dicot phytochrome.
Purpose of the Study:
- To develop an antiserum specific for zucchini (Cucurbita pepo L.) phytochrome.
- To immunopurify zucchini phytochrome and characterize its properties.
- To compare zucchini phytochrome with phytochromes from other dicotyledonous plants (pea and lettuce) and a monocot (oat).
Main Methods:
- Antiserum preparation against undegraded zucchini phytochrome using immunoprecipitation and specific oat phytochrome antiserum.
- Purification of specific antiphytochrome immunoglobulins via affinity chromatography with purified pea phytochrome.
- Immunopurification of zucchini, pea, and lettuce phytochrome using the prepared antibodies.
- Characterization using SDS-PAGE, absorbance spectroscopy, isoelectric focusing, electrophoresis, and amino acid analysis.
Main Results:
- Successfully prepared specific antiserum and immunopurified phytochrome from zucchini, pea, and lettuce.
- All three dicot phytochromes showed a monomer size of approximately 120,000 daltons.
- Zucchini phytochrome exhibited a lower visible-to-ultraviolet absorbance ratio and a higher isoelectric point (6.5-7.0) compared to oat phytochrome.
- Electrophoretic mobility was similar across zucchini, oat, and pea phytochrome under nondenaturing conditions.
- Amino acid composition of zucchini phytochrome closely resembled that of oat and rye phytochrome.
Conclusions:
- The study successfully generated specific antibodies for zucchini phytochrome purification.
- Zucchini phytochrome shares conserved structural and biochemical properties with other dicot phytochromes.
- These findings contribute to a better understanding of phytochrome diversity and function in plants.
Related Concept Videos
01:25Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
02:00Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.