Manganese stabilizing protein of photosystem II is a thermostable, natively unfolded polypeptide

被引:88
作者
Lydakis-Simantiris, N
Hutchison, RS
Betts, SD
Barry, BA
Yocum, CF
机构
[1] Univ Michigan, Dept Biol, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA
[3] Univ Minnesota, Dept Biochem Mol Biol & Biophys, St Paul, MN 55108 USA
关键词
D O I
10.1021/bi981847z
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
The thermostability of manganese stabilizing protein of photosystem II was examined by biochemical and spectroscopic techniques. Samples of both native and recombinant spinach manganese stabilizing protein incubated at 90 degrees C and then cooled to 25 degrees C were capable of rebinding to, and of reactivating, the O-2-evolution activity of photosystem II membranes from which the native protein had been removed. Far-UV circular dichroism and FT-IR spectroscopies were used to analyze the structural consequences of heating manganese stabilizing protein. The data obtained from these techniques show that heating causes a complete loss of the protein's secondary structure, and that this is a reversible, noncooperative phenomenon. Upon cooling, the secondary structures of the heat-treated proteins return to a state similar to, but not identical with, that of the native, unheated controls. Restoration of a near-native tertiary structure is confirmed both by size-exclusion chromatography and by near-UV circular dichroism. The functional and structural thermostability of manganese stabilizing protein reported here, in conjunction with additional known properties of this protein (acidic pI, high random coil and turn content, anomalous hydrodynamic behavior), identifies manganese stabilizing protein as a natively unfolded protein [Weinreb et al. (1996) Biochemistry 35, 13709-13715]. Although these proteins lack amino acid sequence identity, their functional solution conformations under physiological conditions are said to be "natively unfolded". We suggest that, as with other members of this family of proteins, the natively unfolded structure of manganese stabilizing protein facilitates the highly effective protein-protein interactions that are necessary for its assembly into photosystem II.
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页码:404 / 414
页数:11
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