Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo y học: "The phytochrome red/far-red photoreceptor superfamily"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Minireview cung cấp cho các bạn kiến thức về ngành y đề tài: The phytochrome red/far-red photoreceptor superfamily. | Review The phytochrome red far-red photoreceptor superfamily Robert A Sharrock Address Department of Plant Sciences and Plant Pathology Montana State University Bozeman MT 59717-3150 USA. Email sharrock@montana.edu Published 28 August 2008 Genome Biology 2008 9 230 doi 10.1186 gb-2008-9-8-230 The electronic version of this article is the complete one and can be found online at http genomebiology.com 2008 9 8 230 2008 BioMed Central Ltd Abstract Proteins of the phytochrome superfamily of red far-red light receptors have a variety of biological roles in plants algae bacteria and fungi and demonstrate a diversity of spectral sensitivities and output signaling mechanisms. Over the past few years the first three-dimensional structures of phytochrome light-sensing domains from bacteria have been determined. Light is an important environmental factor in most ecosystems. Photosynthetic organisms in particular must sense and respond to light cues to optimize their growth and metabolism. The quantity direction and spectral make-up the color or quality of the light sensed by an organism conveys information regarding the abiotic and biotic environment and can be used to control adaptive responses. One superfamily of photosensory receptors comprises the phytochromes plant color which absorb in the red far-red part of the spectrum 1 . These receptors were first discovered in plants in the 1950s 2 but have more recently been identified in a broad spectrum of eukaryotic and prokaryotic phyla. In this brief overview I shall focus on recent advances relating principally to the understanding of phytochrome diversity and structure. Phytochromes are reversibly transformed by red and far-red light between conformations with different absorption spectra. The light-sensing moiety in all phytochromes is a covalently attached bilin chromophore. Following synthesis in the cytoplasm the phytochrome apoprotein binds chromophore and in the absence of light this holoprotein folds into a stable .