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Ovalbumin is secreted by the tubular gland cells without cleavage of a signal sequence at the N-terminus. In Escherichia coli strains which produce a chicken ovalbumin-like protein (OLP) from a plasmid-cloned gene, the OLP is synthesized on membrane-bound polysomes and secreted without cleavage into the periplasmic space. In contrast, a deleted protein, which lacks 126 amino acids in the N-terminal half, is not secreted and is synthesized from free polysomes. Our results are compatible with the presence, in the N-terminal half of the molecule, of a signal sequence necessary for the transport across the membrane.
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