The mode of chaperoning of dithiothreitol-denatured alpha-lactalbumin by alpha-crystallin.

Abstract:

:Molecular chaperones prevent the aggregation of partially folded or misfolded forms of protein. alpha-crystallin performs such a function in the ocular lens. To gain insight into the mechanism of the anti-aggregation activity of alpha-crystallin, we performed dynamic light scattering (DLS) measurements investigating its interaction with partially denatured alpha-lactalbumin over a 24 hr period. Analyses were conducted as a function of the concentration of alpha-lactalbumin as well as the bovine alpha-crystallin/alpha-lactalbumin ratio. Additional studies of the systems were performed by HPLC and SDS gel electrophoresis. The particle distribution patterns derived from the DLS data indicated that the chaperoned complex (lactalbumin plus crystallin) is a loose fluffy globular entity. After the complex becomes saturated with lactalbumin, it appears to release the partially denatured lactalbumin which may aggregate into high molecular weight moieties. These eventually may precipitate out of solution. On longer standing, 24hr and over, the chaperoned complex as well as the lactalbumin aggregates become more compact. The chaperoned complex (alpha-crystallin plus alpha-lactalbumin) is in dynamic equilibrium both with the monomeric and the aggregated alpha-lactalbumin population.

authors

Bettelheim FA,Ansari R,Cheng QF,Zigler JS Jr

doi

10.1006/bbrc.1999.1031

subject

Has Abstract

pub_date

1999-08-02 00:00:00

pages

292-7

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)91031-8

journal_volume

261

pub_type

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