Structural changes in bovine lens crystallins induced by ascorbate, metal, and oxygen

Donita Garland, J. Samuel Zigler, Jin Kinoshita

Research output: Contribution to journalArticle

Abstract

Ascorbate, Fe3+, or Cu2+ and oxygen induced the oxidation of bovine lens crystallins. The modifications mimicked those that occur in the lens with aging. The modifications included the formation of nondisulfide crosslinks in α- and βH-crystallin and the cleavage of α-, βH-, and the low molecular weight crystallin fractions. In all three fractions, there was a loss of the more basic protein species and an increase in the more acidic species. Nontryptophan fluorescence with emission spectra between 400 and 500 nm was produced in βH-crystallin. Cu2+ was less effective than Fe3+ in catalyzing the modification of βH-and γ-crystallin. Both metal ions were equally effective in catalyzing the modification of α-crystallin.

Original languageEnglish (US)
Pages (from-to)771-776
Number of pages6
JournalArchives of Biochemistry and Biophysics
Volume251
Issue number2
DOIs
StatePublished - Dec 1986

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ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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