Many membrane proteins and most secreted proteins are initially made as precursors with an N-terminal leader sequence. We now report the isolation of M13 procoat, the precursor of the membrane-bound form of M13 coat protein. There are 40 000 copies of M13 procoat protein/cell during M13 amber 7 virus infection. Purified procoat is quantitatively cleaved by… (More)
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