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  • Title: The chaperone-like alpha-crystallin forms a complex only with the aggregation-prone molten globule state of alpha-lactalbumin.
    Author: Rajaraman K, Raman B, Ramakrishna T, Rao CM.
    Journal: Biochem Biophys Res Commun; 1998 Aug 28; 249(3):917-21. PubMed ID: 9731236.
    Abstract:
    The chaperone-like alpha-crystallin prevents aggregation of several proteins by interacting with their non-native states. Alpha-Lactalbumin adopts different non-native states under different experimental conditions. We have investigated the interaction of alpha-crystallin with three non-identical non-native states, using fluorescence, circular dichroism, and gel filtration chromatography. The compact molten globule state of apo-alpha-lactalbumin in tris buffer does not interact with alpha-crystallin. The expanded, flexible molten globule-like state of reduced apo-alpha-lactalbumin (formed at pH 7.2) also does not interact with alpha-crystallin. Only the aggregation-prone non-native state of reduced apo-alpha-lactalbumin formed at pH 6.0 interacts with alpha-crystallin to form a stable complex. The alpha-crystallin bound reduced apo-alpha-lactalbumin exhibits properties similar to those of a molten globule. Our results show that alpha-crystallin interacts only with the aggregation prone molten globule state of reduced apo-alpha-lactalbumin but not with the other non-aggregating molten globule states of the protein.
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