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. 1999 Oct 4;147(1):33–44. doi: 10.1083/jcb.147.1.33

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© 1999 The Rockefeller University Press

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

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Schematic representation of transit peptide removal and turnover in the chloroplast. Step 1, A precursor entering the stroma with its NH₂-terminal transit peptide first is recognized by SPP. A single endoproteolytic cleavage by SPP releases the mature protein. The transit peptide remains bound by SPP. Step 2, SPP releases the transit peptide by its conversion to a subfragment. The regenerated SPP is free for a new enzyme–substrate interaction. Step 3, The liberated subfragment is degraded by an ATP-dependent, soluble metallopeptidase.