Radiation effects on the native structure of proteins: fragmentation without dissociation.
Arch Biochem Biophys 1998;
352:281-7. [PMID:
9587417 DOI:
10.1006/abbi.1998.0604]
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Abstract
Several proteins (avidin, carboxypeptidase B, glucose-6-phosphate dehydrogenase, glutamate dehydrogenase, maltase, and peroxidase) composed of one to six subunits were irradiated in the frozen state. Each irradiated protein was examined by size-exclusion chromatography (SEC) and by denaturing gel electrophoresis (SDS-PAGE). All these proteins eluted from SEC as a single peak even though SDS-PAGE showed cleavage of the polypeptide backbone of the monomers. Thus, fragmentation of the subunits did not result in dissociation of the oligomeric structure.
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