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Phosphatidylcholine is transferred from chemically-defined liposomes to chloroplasts through proteins of the chloroplast outer envelope membrane

Journal article
Authors Congfei Yin
Mats X. Andersson
H. S. Zhang
Henrik Aronsson
Published in Febs Letters
Volume 589
Issue 1
Pages 177-181
ISSN 0014-5793
Publication year 2015
Published at Department of Biological and Environmental Sciences
Pages 177-181
Language en
Links dx.doi.org/10.1016/j.febslet.2014.1...
Keywords Phosphatidylcholine (PC), Chloroplast, Liposome, Lipid uptake, CELL-FREE TRANSFER, ACID-BINDING-PROTEIN, ENDOPLASMIC-RETICULUM, LIPID, TRAFFICKING, GOLGI-APPARATUS, PEA-CHLOROPLASTS, CONTACT SITES, PLANT-CELLS, RAT-LIVER, METABOLISM, Biochemistry & Molecular Biology, Biophysics, Cell Biology
Subject categories Earth and Related Environmental Sciences

Abstract

Chloroplasts maintain their lipid balance through a tight interplay with the endoplasmic reticulum (ER). The outer envelope membrane of chloroplasts contains a large proportion of the phospholipid phosphatidylcholine (PC), which is synthesized in the ER and also a possible precursor for thylakoid galactolipids. The mechanism for PC transport from the ER to chloroplasts is not known. Using isolated chloroplasts and liposomes containing radiolabeled PC we investigated non-vesicular transport of PC in vitro. PC uptake in chloroplasts was time and temperature dependent, but nucleotide independent. Increased radius of liposomes stimulated PC uptake, and protease treatment of the chloroplasts impaired PC uptake. This implies that the chloroplast outer envelopes contains an exposed proteinaceous machinery for the uptake of PC from closely apposed membranes.

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