期刊
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS
卷 1751, 期 2, 页码 159-169出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbapap.2005.06.007
关键词
BSA; pH denaturation; conformation; aggregation; cysteine-34
Protein aggregation is a well-known phenomenon related to serious medical implications. Bovine serum albumin (BSA), a structural analogue of human serum albumin, has a natural tendency for aggregation under stress conditions. While following effect of moderately acidic pH on BSA, a state was identified at pH 4.2 having increased light scattering capability at 350 nm. It was essentially a dimer devoid of disulphide linked large aggregates as observed from 'spin column' experiments, gel electrophoresis and ultra-centrifugations. Its surface hydrophobic character was comparable to,the native conformer at pH 7.0 as observed by the extraneous fluorescence probes pyrene and pyrene maleimide but its interactions with 1-amino-8-naphthelene sulphonic acid was more favorable. Dimerization was irreversible between pH 4.2 and 7.0 even after treatment with DTT. The role of the only cysteine-34 residue was investigated where modification with reagents of arm length bigger than 6 angstrom prevented dimerization. Molecular modeling of BSA indicated that cys-34 resides in a cleft of 6 angstrom depth. This indicated that the area surrounding the cleft plays important role in inducing the dimerization. (c) 2005 Elsevier B.V. All rights reserved.
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