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Two-dimensional 1H NMR spectroscopy of bovine eye lens alpha-crystallin and its isolated alpha A and alpha B subunits reveals that these aggregates have short and very flexible C-terminal extensions of eight (alpha A) and ten (alpha B) amino acids which adopt little preferred conformation in solution. Total alpha-crystallin forms a tighter aggregate than the isolated alpha A and alpha B subunit aggregates. Our results are consistent with a micelle model for alpha-crystallin quaternary structure. The presence of terminal extensions is a general feature of those crystallins, alpha and beta, which form aggregates.
Carver et al. (Mon,) studied this question.
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