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Updated: Apr 11, 2026

Isolation of Ribosome Bound Nascent Polypeptides in vitro to Identify Translational Pause Sites Along mRNA
Published on: July 6, 2012
Ribonuclease-neutralized pancreatic microsomal membranes from livestock for in vitro co-translational protein
Kurt Vermeire1, Susanne Allan2, Becky Provinciael1
1Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Department of Microbiology and Immunology, KU Leuven-University of Leuven, B-3000 Leuven, Belgium.
Abstract:
Here, we demonstrate that pancreatic microsomal membranes from pigs, sheep, or cattle destined for human consumption can be used as a valuable and ethically correct alternative to dog microsomes for cell-free protein translocation. By adding adequate ribonuclease (RNase) inhibitors to the membrane fraction, successful in vitro co-translational translocation of wild-type and chimeric pre-prolactin into the lumen of rough microsomes was obtained. In addition, the human type I integral membrane proteins CD4 and VCAM-1 were efficiently glycosylated in RNase-treated microsomes. Thus, RNase-neutralized pancreatic membrane fractions from pig, cow, or sheep are a cheap, easily accessible, and fulfilling alternative to canine microsomes.
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