Abstract:Most polypeptides destined for secretion are synthesized on polyribosomes bound to the membrane of the endoplasmic reticulum (E.R.), in contrast, cytosolic proteins are made on free ribosomes. When the messenger RNA (mRNA) for a secretory protein is translated in a cell-free protein synthesizing system, the product is usually larger than the mature protein by about 3,000 daltons. Numerous studies have demonstrated that the higher molecular weight of the cell-free translation product can be attributed to an ami… Show more
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