TY - JOUR
T1 - Alpha-crystallin-Crystallin, a Molecular Chaperone, Forms a Stable Complex with Carbonic Anhydrase upon Heat Denaturation
AU - Vasantha Rao, P.
AU - Horwitz, Joseph
AU - Zigler, Samuel
PY - 1993/1/1
Y1 - 1993/1/1
N2 - Alpha-crystallin, a major eye lens protein of vertebrates has been characterized as a molecular chaperone based on its ability to inhibit the aggregation of proteins undergoing thermal denaturation (Horwitz, J., Proc. Natl. Acad. Sci. USA 1992, 89, 10449-10453). To understand the mechanisms underlying this chaperone-like activity, the present study addressed molecular interactions between α-crystallin and its target proteins. Using carbonic anhydrase as a model target protein, we demonstrate complex formation between the 2 proteins upon heating, as assessed by the criteria of agarose gel electrophoresis, immunoprecipitation, ultrafiltration and gel filtration chromatography. The complex of α-crystallin and carbonic anhydrase is stable, at room temperature and at 4°C, for over 18 hours, and is non-covalent in nature. The results also indicate that α-crystallin binds the early non-native form of the target protein.
AB - Alpha-crystallin, a major eye lens protein of vertebrates has been characterized as a molecular chaperone based on its ability to inhibit the aggregation of proteins undergoing thermal denaturation (Horwitz, J., Proc. Natl. Acad. Sci. USA 1992, 89, 10449-10453). To understand the mechanisms underlying this chaperone-like activity, the present study addressed molecular interactions between α-crystallin and its target proteins. Using carbonic anhydrase as a model target protein, we demonstrate complex formation between the 2 proteins upon heating, as assessed by the criteria of agarose gel electrophoresis, immunoprecipitation, ultrafiltration and gel filtration chromatography. The complex of α-crystallin and carbonic anhydrase is stable, at room temperature and at 4°C, for over 18 hours, and is non-covalent in nature. The results also indicate that α-crystallin binds the early non-native form of the target protein.
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U2 - 10.1006/bbrc.1993.1118
DO - 10.1006/bbrc.1993.1118
M3 - Article
C2 - 8094957
AN - SCOPUS:0027267599
SN - 0006-291X
VL - 190
SP - 786
EP - 793
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 3
ER -