期刊
BIOSCIENCE REPORTS
卷 30, 期 2, 页码 125-134出版社
PORTLAND PRESS LTD
DOI: 10.1042/BSR20090035
关键词
CD; dynamic light scattering; hydropathy; intrinsically unordered protein; premolten globule state
资金
- Department of Science and Technology, New Delhi, India [SR/SO/BD-39/2004]
This is the first report of its kind that well demonstrates that a lectin from Phytolacca americana [Pa-2 (P americana lectin-2)] can also be intrinsically unordered, based on the results obtained by CD, tryptophan fluorescence, ANS (8-anilinonaphthalene-1-sulfonic acid) binding, acrylamide quenching, DLS (dynamic light scattering) and its amino acid composition database analyses Pa-2 is an acidic monomeric lectin and acquires random coil conformation at neutral pH without any regular secondary structure. As confirmed by different spectroscopic techniques, on lowering the pH, some secondary structures, predominantly a-helices, are detected by far-UV CD that adopt a marginally stable partially folded collapsed conformation possessing the characteristics of a premolten globule state. It is in accordance with coil-helix transition that is commonly observed when these intrinsically unordered proteins interact with their partner molecules in vivo.
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