Chloroplast protein import inhibition by a soluble factor from wheat germ lysate

Chloroplast protein import inhibition by a soluble factor from wheat germ lysate Protein import into chloroplasts occurs post-translationally in vitro. The precursor proteins are generally synthesised in a reticulocyte lysate- or wheat germ lysate-derived system and imported out of this system into chloroplast. These complex soluble protein mixtures are likely to contain factors, which influence somehow the import competence and import efficiency. Here we describe a heat-stable soluble proteinaceaous factor, which inhibits protein import into chloroplasts in vitro. The inhibitor interacts directly with the precursor protein and renders it import incompetent. This mode of action is supported by two observations: firstly, binding of the precursor to the chloroplast surface is diminished in the presence of the inhibitor. Secondly, when chloroplasts were loaded with precursor proteins under conditions, which allow only binding but not import the inhibitor was unable to abolish the subsequent translocation step. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Chloroplast protein import inhibition by a soluble factor from wheat germ lysate

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2002 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1016027020193
Publisher site
See Article on Publisher Site

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