Substrate-Dependent and Organ-Specific Chloroplast Protein Import in Planta
نویسندگان
چکیده
منابع مشابه
Substrate-dependent and organ-specific chloroplast protein import in planta.
The NADPH-dependent protochlorophyllide (Pchlide) oxidoreductase (POR) is unique because it is a photoenzyme that requires light for its catalytic activity and uses Pchlide itself as a photoreceptor. In Arabidopsis, there are three structurally related PORs, denoted PORA, PORB, and PORC. The import of one of them, PORA, into plastids of cotyledons is substrate dependent. This substrate dependen...
متن کاملMolecular chaperone involvement in chloroplast protein import.
Chloroplasts are organelles of endosymbiotic origin that perform essential functions in plants. They contain about 3000 different proteins, the vast majority of which are nucleus-encoded, synthesized in precursor form in the cytosol, and transported into the chloroplasts post-translationally. These preproteins are generally imported via envelope complexes termed TOC and TIC (Translocon at the O...
متن کاملMolecular chaperones involved in chloroplast protein import.
Transport of cytoplasmically synthesized precursor proteins into chloroplasts, like the protein transport systems of mitochondria and the endoplasmic reticulum, appears to require the action of molecular chaperones. These molecules are likely to be the sites of the ATP hydrolysis required for precursor proteins to bind to and be translocated across the two membranes of the chloroplast envelope....
متن کاملMechanisms of Chloroplast Protein Import in Plants
F. Kessler Laboratoire de Physiologie Végétale, Université de Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland e-mail: [email protected] Abstract Most chloroplast proteins are encoded as preproteins by the nuclear genome. Their import into chloroplasts occurs post-translationally. An N-terminal pre-sequence, the transit peptide, contains the organellar targeting information. It ...
متن کاملA second, substrate-dependent site of protein import into chloroplasts.
Chloroplasts must import a large number of proteins from the cytosol. It generally is assumed that this import proceeds for all stromal and thylakoid proteins in an identical manner and is caused by the operation of two distinctive protein import machineries in the outer and inner plastid envelope, which form the general import site. Here we show that there is a second site of protein transloca...
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ژورنال
عنوان ژورنال: The Plant Cell
سال: 2003
ISSN: 1040-4651,1532-298X
DOI: 10.1105/tpc.015008