Several proteins imported into chloroplasts form stable complexes with the CroEL-related chloroplast molecular chaperone

Nine different proteins were imported into isolated pea chloroplasts in vitro. For seven of these [the large and small subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), beta-subunit of ATP synthase, glutamine synthetase, the light-harvesting chlorophyll a/b binding protein, chlo...

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Bibliographic Details
Published in:The Plant cell 1989-12, Vol.1 (12)
Main Authors: Lubben, T.H. (E.I. DuPont de Nemours and Co., Wilmington, DE), Donaldson, G.K, Vitanen, P.V, Gatenby, A.A
Format: Article
Language:English
Subjects:
ACILTRANSFERASA
ACYLTRANSFERASE
AMIDE HYDROLASE
AMIDO HIDROLASA
CHLOROPHYLLE
CHLOROPLASTE
CLOROFILAS
CLOROPLASTO
ELECTROFORESIS
ELECTROPHORESE
LIASAS
LIGASAS
LIGASE
LYASE
PISUM SATIVUM
PROTEINAS
PROTEINAS VEGETALES
PROTEINE
PROTEINE VEGETALE
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Summary:Nine different proteins were imported into isolated pea chloroplasts in vitro. For seven of these [the large and small subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), beta-subunit of ATP synthase, glutamine synthetase, the light-harvesting chlorophyll a/b binding protein, chloramphenicol acetyltransferase, and pre-beta-lactamase], a fraction was found to migrate as a stable high-molecular-weight complex during nondenaturing gel electrophoresis. This complex contained the mature forms of the imported proteins and the groEL-related chloroplast chaperonin 60 (previously known as Rubisco subunit binding protein). Thus, the stable association of imported proteins with this molecular chaperone is widespread and not necessarily restricted to Rubisco subunits or to chloroplast proteins. With two of the imported proteins (ferredoxin and superoxide dismutase), such complexes were not observed. It seems likely that, in addition to its proposed role in assembly of Rubisco, the chloroplast chaperonin 60 is involved in the assembly or folding of a wide range of proteins in chloroplasts
ISSN:1040-4651
1532-298X