No specific recognition of leader peptide by SecB, a chaperone involved in protein export

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Science  18 May 1990:
Vol. 248, Issue 4957, pp. 860-863
DOI: 10.1126/science.2188362


Most proteins destined for export from Escherichia coli are made as precursors containing amino-terminal leader sequences that are essential for export and that are removed during the process. The initial step in export of a subset of proteins, which includes maltose-binding protein, is binding of the precursor by the molecular chaperone SecB. This work shows directly that SecB binds with high affinity to unfolded maltose-binding protein but does not specifically recognize and bind the leader. Rather, the leader modulates folding to expose elements in the remainder of the polypeptide that are recognized by SecB.

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