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PLANT PHYSIOLOGY , Vol 108, Issue 2 693-701, Copyright © 1995 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Characterization and Physiological Function of Class I Low-Molecular-Mass, Heat-Shock Protein Complex in Soybean
T. L. Jinn, Y. M. Chen and C. Y. Lin
Department of Botany, National Taiwan University, Taipei, Taiwan
Examination of an ammonium sulfate-enriched fraction (70-100% saturation)
of heat-shock proteins (HSPs) by nondenaturing polyacrylamide gel
electrophoresis revealed the presence of a high molecular mass complex (280
kD) in soybean (Glycine max) seedlings. This complex cross-reacted with
antibodies raised against soybean class I low-molecular-mass (LMW) HSPs.
Dissociation of the complex by denaturing polyacrylamide gel
electrophoresis showed the complex to contain at least 15 polypeptides of
the 15-to 18-kD class I LMW HSPs that could be detected by staining,
radiolabeling, and western blotting. A similar LMW-HSP complex was observed
in mung bean (Vigna radiata L.; 295 kD), in pea (Pisum sativum L.; 270 kD),
and in rice (Oryza sativa L.; 310 kD). The complex was stable under high
salt conditions (250 mM KCI), and the integrity was not affected by 1%
Nonidet P-40 and 3 [mu]g/ML RNase treatment. The size of the isolated HSP
complex in vitro was conserved to 55[deg]C; however, starting at
37.5[deg]C, it changed to higher molecular forms in the presence of soluble
proteins. The isolated HSP complex was able to protect up to 75% of the
soluble proteins from heat denaturation in vitro.
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