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- W1589331383 abstract "The light-harvesting chlorophyll a/b protein (LHCP) is synthesized in the cytosol as a precursor (pLHCP) that is imported into chloroplasts and assembled into thylakoid membranes. Under appropriate conditions, either pLHCP or LHCP will integrate into isolated thylakoids. We have identified two situations that inhibit integration in this assay. Ionophores and uncouplers inhibited integration up to 70%. Carboxyl-terminal truncations of pLHCP also interfered with integration. A 22-residue truncation reduced integration to about 25% of control, whereas a 93 residue truncation completely abolished it. When pLHCP was imported into chloroplasts in the presence of uncouplers or when truncated forms of pLHCP were used, significant amounts of the imported proteins failed to insert into thylakoids and instead accumulated in the aqueous stroma. Accumulation of stromal LHCP occurred at uncoupler concentrations required to dissipate the trans-thylakoid proton electrochemical gradient and was enhanced at reduced levels of ATP. The latter effect may be a secondary consequence of a reduction in ATP-dependent degradation within the stroma. These results indicate that the stroma is an intermediate location in the LHCP assembly pathway and provide the first evidence for a soluble intermediate during biogenesis of a chloroplast membrane protein." @default.
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- W1589331383 date "1989-08-01" @default.
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- W1589331383 title "An Imported Thylakoid Protein Accumulates in the Stroma When Insertion into Thylakoids is Inhibited" @default.
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- W1589331383 doi "https://doi.org/10.1016/s0021-9258(18)71667-0" @default.
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