The composition of zymogen granules from rat pancreas was determined by LC-MS/MS. Enriched intragranular content, peripheral membrane, and integral membrane protein fractions were analyzed after one-dimensional SDS-PAGE and tryptic digestion of gel slices. A total of 371 proteins was identified with high confidence, including 84 previously identified granule proteins. The 287 remaining proteins included 37 GTP-binding proteins and effectors, 8 tetraspan membrane proteins, and 22 channels and transporters. Seven proteins, pantophysin, cyclic nucleotide phosphodiesterase, carboxypeptidase D, ecto-nucleotide phosphodiesterase 3, aminopeptidase N, ral, and the potassium channel TWIK-2, were confirmed by immunofluorescence microscopy or by immunoblotting to be new zymogen granule membrane proteins.
Proteomic analysis of pancreatic zymogen granules: identification of new granule proteins.
M. Rindler,Chong-feng Xu,I. Gumper,N. Smith,T. Neubert
Published 2007 in Journal of Proteome Research
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- Publication year
2007
- Venue
Journal of Proteome Research
- Publication date
2007-06-21
- Fields of study
Biology, Medicine
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Semantic Scholar, PubMed
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