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Biological aging is associated with the oxidation and/or aggregation of a variety of proteins, which may contribute to the age-dependent loss of function. Protein modification can be caused by multiple chemical mechanisms, which may selectively target specific proteins. Here we show that the ZnT-1 isoform of the family of cation diffusion facilitators suffers age-dependent oxidation and covalent aggregation. Parallel in vitro experiments with a plasma membrane-rich fraction and recombinant ZnT-1 suggest that ZnT-1 aggregation may be caused by metal-catalyzed oxidation (MCO). The latter would be consistent with the known propensity of metal-binding proteins to suffer MCO.
Pubmed ID: 17997256
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A a configurable software package for peptide and protein mass spectrometry analyses. It includes the SEQUEST search algorithm to identify separate proteins in complex mixtures, interactive navigation tools to filter and sort protein summaries, customized spectral plots, and chromatograms using the PEPMATCH and PEPMAP tools. This software also has batch processing capabilities to improve throughput by queuing up several files, and custom-build proprietary databases, index databases, and retrieve databases through a public server.
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